bluuebunny/crossref_metadata_2025 huggingface dataset:
A companion star in the SED modeling of the HD 142527 stellar system
Authors: Nagel Erick
Published: January 2014

The discovery of a likely companion of the Herbig Ae/Be star HD 142527 motivates the study of the effect that it produces on the SED. The main change on the system configuration is the formation of a gap in the disk in which the companion is embedded, following the orbit of the secondary star. This results in the formation of a wall (at the outer gap edge), which is illuminated by stellar radiation. We present a model for the SED, taking into account all the components of the system: the two stars, the disk with two gaps (one produced by the stellar companion and the other by potential planets), three walls (two associated with the gaps and the other with dust sublimation), optically thin material in the gaps and in a halo. The size of the modeled spherical halo is smaller than found in a previous study.
Planets and Stellar Activity: Hide and Seek in the CoRoT-7 system
Authors: Haywood R. D. , Cameron A. C. , Queloz D. , Barros S. C. C. , Deleuil M. , Fares R. , Gillon M. , Hatzes A. , Lanza A. F. , Lovis C. , Moutou C. , Pepe F. , Pollacco D. , Santerne A. , Ségransan D. , Unruh Y.
Published: January 2014

Since the discovery of the transiting Super-Earth CoRoT-7b, several investigations have been made of the number and precise masses of planets present in the system, but they all yield different results, owing to the star's high level of activity. Radial velocity (RV) variations induced by stellar activity therefore need to be modelled and removed to allow a reliable detection of all planets in the system. We re-observed CoRoT-7 in January 2012 with both HARPS and the CoRoT satellite, so that we now have the benefit of simultaneous RV and photometric data. We fitted the off-transit variations in the CoRoT lightcurve using a harmonic decomposition similar to that implemented in Queloz et al. (2009). This fit was then used to model the stellar RV contribution, according to the methods described by Aigrain et al. (2011). This model was incorporated into a Monte Carlo Markov Chain in order to make a precise determination of the orbits of CoRoT-7b and CoRoT-7c. We also assess the evidence for the presence of one or two additional planetary companions.
Exoplanet Transit Spectroscopy of Hot Jupiters Using HST/WFC3
Authors: Haynes Korey , Mandell Avi M. , Sinukoff Evan , Madhusudhan Nikku , Burrows Adam , Deming Drake
Published: January 2014

We present analysis of transit spectroscopy of three extrasolar planets, WASP-12 b, WASP-17 b, and WASP-19 b, using the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST). Measurement of molecular absorption in the atmospheres of these planets offers the chance to explore several outstanding questions regarding the atmospheric structure and composition of these highly irradiated, Jupiter-mass objects. We analyze the data for a single transit for each planet, using a strategy similar in certain aspects to the techniques used by Berta (2012), and achieve almost photon-limited results for individual spectral bins. Our final transit spectra are consistent with the presence of a broad absorption feature at 1.4 μm most likely due to water, but the amplitude of the absorption is less than expected based on previous observations with Spitzer, possibly due to hazes absorbing in the NIR. However, the degeneracy of models with different compositions and temperature structures combined with the low amplitude of any features in the data preclude our ability to place unambiguous constraints on the atmospheric composition without a comprehensive multi-wavelength analysis.
From spectra to atmospheres: solving the underconstrained retrieval problem for exoplanets
Authors: Barstow Joanna K. , Aigrain Suzanne , Irwin Patrick G. J. , Bowles Neil , Fletcher Leigh N. , Lee Jae-Min
Published: January 2014

Spectroscopic observations of transiting exoplanets have provided the first indications of their atmospheric structure and composition. Optimal estimation retrievals have been successfully applied to solar system planets to determine the temperature, composition and aerosol properties of their atmospheres, and have recently been applied to exoplanets. We show the effectiveness of the technique when combined with simulated observations from the proposed space telescope EChO, and also discuss the difficulty of constraining a complex system with sparse data and large uncertainties, using the super-Earth GJ 1214b as an example.
Hα Absorption in Transiting Exoplanet Atmospheres
Authors: Christie Duncan , Arras Phil , Li Zhi-Yun
Published: January 2014

Recent observations by Jensen et al. of Hα absorption by the upper atmosphere of HD189733b have motivated the need for a theoretical understanding of the distribution of n=2 hydrogen within hot Jupiter atmospheres. With this in mind, we model the n=2 state of atomic hydrogen in a hydrostatic atmosphere in thermal and photoionization equilibrium. Both collisional and radiative transitions are included in the calculation of the n = 2 state level population. In our model, the Hα absorption is dominated by a τ ~ 1 shell composed of metastable 2s hydrogen located within the neutral atomic layer, with the contribution coming roughly uniformly throughout the layer instead of from a specific impact parameter. An ionization rate an order of magnitude over the expected value can reproduce the observed transit depth.
The Role of Oxygen Abundances in Exoplanet Host Star C/O Ratios: A Case Study of 55 Cnc
Authors: Teske Johanna K. , Cunha Katia , Smith Verne V. , Schuler Simon C. , Griffith Caitlin A.
Published: January 2014

We derive the C/O ratio for the exoplanet host star 55 Cnc based on archive Keck/HIRES spectra. The C/O ratio varies widely depending on which oxygen abundance indicator – the 6300.3 Å [O I] line, the 6363.8 Å [O I] line, or the 7774 Å O I triplet – is used, and we find there is still a large uncertainty even based on individual abundance indicators. This case study demonstrates that caution and care are necessary when determining exoplanet host star C/O ratios, and when considering host star C/O ratios in inferring exoplanet compositions.
A Resolved Millimeter Emission Belt in the AU Mic Debris Disk
Authors: MacGregor Meredith
Published: January 2014

Imaging debris disks at millimeter wavelengths is important, because emission at these long wavelengths is dominated by large grains with dynamics similar to the population of dust-producing planetesimals. We have used the SMA and ALMA to make 1.3 millimeter observations of the debris disk surrounding the nearby (9.9 pc), ~10 Myr-old, M-type flare star AU Microscopii. We characterize the disk by implementing Markov Chain Monte Carlo methods to fit parametric models to the visibilities. The millimeter observations reveal a belt of dust emission that peaks at a radius of 40 AU. This outer size scale agrees with predictions for a reservoir of planetesimals (a “birth ring”) based on the shape of the midplane scattered light profile. We do not find any significant asymmetries in the structure or the centroid position of the emission belt. The ALMA observations with a resolution of 0.6 arcsec (6 AU) also reveal a previously unknown central emission peak, ~6 times brighter than the stellar photosphere at these wavelengths. This central component remains unresolved and could be explained by stellar activity or an inner planetesimal belt located ≲3 AU from the star and containing roughly 1% the mass of the outer belt. Future observations with higher angular resolution will be able to distinguish between these possibilities.
LIDT-DD: A New Self-Consistent Debris Disc Model Including Radiation Pressure and Coupling Dynamical and Collisional Evolution
Authors: Kral Q. , Thebault P. , Charnoz S.
Published: January 2014

The first attempt at developing a fully self-consistent code coupling dynamics and collisions to study debris discs (Kral et al. 2013) is presented. So far, these two crucial mechanisms were studied separately, with N-body and statistical collisional codes respectively, because of stringent computational constraints.

We present a new model named LIDT-DD which is able to follow over long timescales the coupled evolution of dynamics (including radiation forces) and collisions in a self-consistent way.
Finding Asteroid belt Analogues with WISE
Authors: Patel Rahul I. , Metchev Stanimir
Published: January 2014

We present the detection of stars with infrared (IR) excesses attributed to circumstellar debris disks from the WISE All-Sky Survey at the WISE 12 and 22 μm bandpasses (W3 and W4, respectively). Excess flux at these wavelengths is significant because it traces material in the regions of terrestrial planet formation. We searched for debris disks by cross-matching Hipparcos main sequence stars with the All-Sky Data Release from WISE and seeking excess flux at W3 and W4. Our sample is confined to a volume of 75 pc around the sun, and outside the galactic plane (|b|>5°). Debris disk-bearing stars were identified as 95%-confidence outliers in 2MASS/WISE color distributions, after checking for erroneous photometry and contamination from unrelated nearby objects.
Making systems of Super Earths by inward migration of planetary embryos
Authors: Cossou Christophe , Raymond Sean N. , Pierens Arnaud
Published: January 2014

Using N-body simulations with planet-disk interactions, we present a mechanism capable of forming compact systems of hot super Earths such as Kepler 11. Recent studies show that outward migration is common in the inner parts of radiative disks. However we show that two processes naturally tip the balance in favor of inward migration. First the corotation torque is too weak to generate outward migration for planetary embryos less massive than 4M⊕. Second, system of multiple embryos generate sustained non-zero eccentricities that damp the corotation torque and again favor inward migration. Migration and accretion of planetary embryos in realistic disks naturally produce super Earths in resonant chains near the disk inner edge. Their compact configuration is similar to the observed systems.
Protostellar Disks, Planet Traps, and the Origins of Exoplanetary Systems
Authors: Pudritz Ralph E. , Hasegawa Yasuhiro
Published: January 2014

The mass-semimajor axis diagram for exoplanets is populated by at least three distinct planetary populations: hot Jupiters at small orbital radii, more massive Jovian planets gathered at about 1 AU, and a rapidly growing population of SuperEarths at short periods. Our work shows that low mass and rapidly migrating planetary cores get trapped at disk inhomogeneities, where strong density or thermal gradients exist (namely dead zone boundaries, ice lines, and disk heating transition regions). Planet growth and movement occur at rates dictated by planetary accretion, and the slow radial inward motion of the traps due to falling disk accretion rates during disk evolution. By combining the theory of traps in evolving disks with standard ideas about how protoplanets accrete, we develop evolutionary tracks of how planets evolve in the mass- semimajor axis diagram. Our models account for the planetary “pile-up” at 1AU, the origin of SuperEarths and hot Jupiters, and the relative scarcity of Jovian planets at large distances.
Atmospheric dynamics on tidally locked Earth-like planets in the habitable zone of an M dwarf star
Authors: Carone Ludmila , Keppens Rony , Decin Leen
Published: January 2014

We investigated the large scale atmospheric circulation of Gl581g, a potentially habitable planet around an M dwarf star, using an idealized dry global circulation model (GCM) with simplified thermal forcing as a first step towards a systematic extended parameter study. The results are compared with the work of Joshi et al. (1997) who investigated a tidally-locked habitable Earth analogue with less than half the rotation period of Gl581g. The extent, form and strength of the atmospheric circulation in each model generally agree with each other, even though the models differ in key parameters such as planetary radius, surface gravity, forcing scheme and rotation period. The substellar point is associated with an uprising direct circulation-branch of a Hadley-like cell with return flow over the poles. It is compelling to assume that the substellar point of a tidally locked terrestrial exoplanet behaves dynamically like the Earth's tropic associated with clouds and precipitation, making it an ideal target for habitability.
Ice Condensation as a Planet Formation Mechanism
Authors: Ros Katrin
Published: January 2014

Particles in protoplanetary discs grow rapidly to millimetre-sizes via coagulation, but further growth to centimetre-sized pebbles is not yet completely understood. We investigate particle growth by ice condensation in a model where we take the dynamical behaviour of vapour and ice particles into account, as well as the size evolution due to condensation and sublimation. Our results show that efficient growth from dust to pebbles is possible close to the water ice line at ~3 AU, with particles growing from millimetres to decimetres on a time scale of 10000 yr.
The Influence of Alfvén Ionization on Exoplanetary Atmospheres
Authors: Stark Craig R. , Helling Christiane , Diver Declan A.
Published: January 2014

Observations of radio emission from exoplanets and brown dwarfs suggest that such objects harbour atmospheric magnetized plasmas. However, the degree of thermal ionization for such substellar objects is insufficient to qualify the ionized component as a plasma, posing the question: what ionization processes can efficiently produce the required plasma? We propose Alfvén ionization as a mechanism for producing localized pockets of ionized gas in the atmosphere, having sufficient degrees of ionization (≥10−7) that they constitute plasmas. We outline the criteria required for Alfvén ionization to occur and justify its applicability in substellar atmospheres. For the model atmospheres considered here, our results show that degrees of ionization ranging from 10−6−1 can be obtained.
Constraining Planetary Migration Mechanisms in Systems of Giant Planets
Authors: Dawson Rebekah I. , Murray-Clay Ruth A. , Johnson John Asher
Published: January 2014

It was once widely believed that planets formed peacefully in situ in their proto-planetary disks and subsequently remain in place. Instead, growing evidence suggests that many giant planets undergo dynamical rearrangement that results in planets migrating inward in the disk, far from their birthplaces. However, it remains debated whether this migration is caused by smooth planet-disk interactions or violent multi-body interactions. Both classes of model can produce Jupiter-mass planets orbiting within 0.1 AU of their host stars, also known as hot Jupiters. In the latter class of model, another planet or star in the system perturbs the Jupiter onto a highly eccentric orbit, which tidal dissipation subsequently shrinks and circularizes during close passages to the star. We assess the prevalence of smooth vs. violent migration through two studies. First, motivated by the predictions of Socrates et al. (2012), we search for super-eccentric hot Jupiter progenitors by using the “photoeccentric effect” to measure the eccentricities of Kepler giant planet candidates from their transit light curves. We find a significant lack of super- eccentric proto-hot Jupiters compared to the number expected, allowing us to place an upper limit on the fraction of hot Jupiters created by stellar binaries. Second, if both planet-disk and multi-body interactions commonly cause giant planet migration, physical properties of the proto-planetary environment may determine which is triggered. We identify three trends in which giant planets orbiting metal rich stars show signatures of planet-planet interactions: (1) gas giants orbiting within 1 AU of metal-rich stars have a range of eccentricities, whereas those orbiting metal- poor stars are restricted to lower eccentricities; (2) metal-rich stars host most eccentric proto-hot Jupiters undergoing tidal circularization; and (3) the pile-up of short-period giant planets, missing in the Kepler sample, is a feature of metal-rich stars and is largely recovered for giants orbiting metal-rich Kepler host stars. These two studies suggest that both disk migration and planet-planet interactions may be widespread, with the latter occurring primarily in metal-rich planetary systems where multiple giant planets can form. Funded by NSF-GRFP DGE-1144152.
Determination of Temperature in Solar Prominences/Filaments Using FISS Observations
Authors: Chae Jongchul , Park Hyungmin , Song Donguk
Published: January 2014

Using the Fast Imaging Solar Spectrograph of the 1.6 meter New Solar Telescope at Big Bear, we simultaneously took the spectral profiles of the Hα line and the Ca ii line at 854.2 nm from prominences beyond the solar limb and filaments on the disk. The spectral data were fitted by the slab model of radiative transfer with constant source function, either with zero background intensity profile (in prominences) or with carefully constructed background intensity profile (in filaments). These observations with different perspectives and different analyses produced consistent results: temperature inside prominences/filaments ranges from 4000 to 20000 K with a mean of about 9500 K. We expect that this kind of observation and analysis with higher spatial resolution and higher temporal resolution will allow us to study in detail the thermal structure and evolution of plasma in prominences.
A first look into the magnetic field configuration of prominence threads using spectropolarimetric data
Authors: Suárez D. Orozco , Ramos A. Asensio , Bueno J. Trujillo
Published: January 2014

We show preliminary results of an ongoing investigation aimed at determining the configuration of the magnetic field vector in the threads of a quiescent hedgerow solar prominence using high-spatial resolution spectropolarimetric observations taken in the He I 1083.0 nm multiplet. The data consist of a two-dimensional map of a quiescent hedgerow prominence showing vertical threads. The observations were obtained with the Tenerife Infrared Polarimeter attached to the German Vacuum Tower Telescope at the Observatorio del Teide (Spain). The He I 1083.0 nm Stokes signals are interpreted with an inversion code, which takes into account the key physical processes that generate and/or modify circular and linear polarization signals in the He I 1083.0 nm triplet: the Zeeman effect, anisotropic radiation pumping, and the Hanle effect. We present initial results of the inversions, i.e, the strength and orientation of the magnetic field vector along the prominence and in prominence threads.
Primary observations of solar filaments using the multi-channel imaging system of the New Vacuum Solar Telescope
Authors: Xu Zhi , Jin Zhen Y. , Xu Fang Y. , Liu Zhong ,   the NVST team
Published: January 2014

The New Vacuum Solar Telescope (NVST) is a new generation ground-based solar facility of China. One of the post-focus instruments is the multi-channel high-resolution imaging system, which is designed to simultaneously observe the dynamic gas motion in the solar photosphere and chromosphere. Since October of 2010 it has been operational in the NVST and some necessary updates were performed in past 2 years. Here we first give a general introduction of this system, and then we exhibit one near-limb observation of solar filaments obtained using this system. By this communication, we would like to show the potential ability to perform the high resolution observation of solar filaments (prominences) using the multi-channel imaging system in the NVST.
Observations of flux rope formation prior to coronal mass ejections
Authors: Green Lucie M. , Kliem Bernhard
Published: January 2014

Understanding the magnetic configuration of the source regions of coronal mass ejections (CMEs) is vital in order to determine the trigger and driver of these events. Observations of four CME productive active regions are presented here, which indicate that the pre-eruption magnetic configuration is that of a magnetic flux rope. The flux ropes are formed in the solar atmosphere by the process known as flux cancellation and are stable for several hours before the eruption. The observations also indicate that the magnetic structure that erupts is not the entire flux rope as initially formed, raising the question of whether the flux rope is able to undergo a partial eruption or whether it undergoes a transition in specific flux rope configuration shortly before the CME.
FIP bias in a sigmoidal active region
Authors: Baker D. , Brooks D. H. , Démoulin P. , van Driel-Gesztelyi Lidia , Green L. M. , Steed K. , Carlyle J.
Published: January 2014

We investigate first ionization potential (FIP) bias levels in an anemone active region (AR) - coronal hole (CH) complex using an abundance map derived from Hinode/EIS spectra. The detailed, spatially resolved abundance map has a large field of view covering 359″ × 485″. Plasma with high FIP bias, or coronal abundances, is concentrated at the footpoints of the AR loops whereas the surrounding CH has a low FIP bias, ~1, i.e. photospheric abundances. A channel of low FIP bias is located along the AR's main polarity inversion line containing a filament where ongoing flux cancellation is observed, indicating a bald patch magnetic topology characteristic of a sigmoid/flux rope configuration.
The contribution of X-ray polar blowout jets to the solar wind mass and energy
Authors: Poletto Giannina , Sterling Alphonse C. , Pucci Stefano , Romoli Marco
Published: January 2014

Blowout jets constitute about 50% of the total number of X-ray jets observed in polar coronal holes. In these events, the base magnetic loop is supposed to blow open in what is a scaled-down representation of two-ribbon flares that accompany major coronal mass ejections (CMEs): indeed, miniature CMEs resulting from blowout jets have been observed. This raises the question of the possible contribution of this class of events to the solar wind mass and energy flux. Here we make a first crude evaluation of the mass contributed to the wind and of the energy budget of the jets and related miniature CMEs, under the assumption that small-scale events behave as their large-scale analogs. This hypothesis allows us to adopt the same relationship between jets and miniature-CME parameters that have been shown to hold in the larger-scale events, thus inferring the values of the mass and kinetic energy of the miniature CMEs, currently not available from observations. We conclude our work estimating the mass flux and the energy budget of a blowout jet, and giving a crude evaluation of the role possibly played by these events in supplying the mass and energy that feeds the solar wind.
Evolution of interplanetary coronal mass ejections and magnetic clouds in the heliosphere
Authors: Démoulin Pascal
Published: January 2014

Interplanetary Coronal Mass Ejections (ICMEs), and more specifically Magnetic Clouds (MCs), are detected with in situ plasma and magnetic measurements. They are the continuation of the CMEs observed with imagers closer to the Sun. A review of their properties is presented with a focus on their magnetic configuration and its evolution. Many recent observations, both in situ and with imagers, point to a key role of flux ropes, a conclusion which is also supported by present coronal eruptive models. Then, is a flux rope generically present in an ICME? How to quantify its 3D physical properties when it is detected locally as a MC? Is it a simple flux rope? How does it evolve in the solar wind? This paper reviews our present answers and limited understanding to these questions.
The Chinese Giant Solar Telescope
Authors: Liu Zhong , Deng Yuanyong , Ji Haisheng
Published: January 2014

Chinese Giant Solar Telescope is the next generation ground-based solar telescope. The main science task of this telescope is to observe the ultra fine structures of the solar magnetic field and dynamic field. Due to the advantages in polarization detection and thermal controlling with a symmetrical circular system, the current design of CGST is a 6~8 meter circular symmetrical telescope. The results of simulations and analysis showed that the current design could meet the demands of most science cases not only in infrared bands but also in near infrared bands and even in visible bands. The prominences and the filaments are very important science cases of CGST. The special technologies for prominence observation will be developed, including the day time laser guide star and MCAO. CGST is proposed by all solar observatories and several institutes and universities in China. It is supported by CAS and NSFC (National Natural Science Foundation of China) as a long term astronomical project.
On Critical Heights and Longitudinal Magnetic Field Strength in Prominences
Authors: Alexeeva I. V. , Kim I. S.
Published: January 2014

The distributions of the measured longitudinal magnetic field strength, B″, and maximum height observed, h, are presented. 50 Mm, 30–35 G and 50 G respectively are found to be the critical h and B″ for the pre-eruption of quiescent prominences.
The spatial relation between EUV cavities and linear polarization signatures
Authors: Bak-Stȩślicka Urszula , Gibson Sarah E. , Fan Yuhong , Bethge Christian , Forland Blake , Rachmeler Laurel A.
Published: January 2014

Solar coronal cavities are regions of rarefied density and elliptical cross-section. The Coronal Multi-channel Polarimeter (CoMP) obtains daily full-Sun coronal observations in linear polarization, allowing a systematic analysis of the coronal magnetic field in polar-crown prominence cavities. These cavities commonly possess a characteristic “lagomorphic” signature in linear polarization that may be explained by a magnetic flux-rope model. We analyze the spatial relation between the EUV cavity and the CoMP linear polarization signature.
24 synoptic maps 1974-1982 (ascending phase of cycle XXI) of 323 prominence average magnetic fields measured by the Hanle effect
Authors: Bommier Véronique
Published: January 2014

The poster was made of 323 average prominence magnetic fields reported on 24 synoptic maps. The paper first resumes the methods for the field derivation, and the different results of the whole program of these second generation Hanle effect observations. From their conclusions, it was possible to derive a unique field vector for each of the 323 prominences. The maps put in evidence a large scale structure of the prominence magnetic field, probably distorted by the differential rotation, which leads to a systematically small angle (on the order of 30°) between the field vector and the prominence long axis.
The solar physics FORWARD codes: Now with widgets!
Authors: Forland Blake , Gibson Sarah , Dove James , Kucera Therese
Published: January 2014

We have developed a suite of forward-modeling IDL codes (FORWARD) to convert analytic models or simulation data cubes into coronal observables, allowing a direct comparison with observations. Observables such as extreme ultraviolet, soft X-ray, white light, and polarization images from the Coronal Multichannel Polarimeter (CoMP) can be reproduced. The observer's viewpoint is also incorporated in the FORWARD analysis and the codes can output the results in a variety of forms in order to easily create movies, Carrington maps, or simply observable information at a particular point in the plane of the sky. We present a newly developed front end to the FORWARD codes which utilizes IDL widgets to facilitate ease of use by the solar physics community. Our ultimate goal is to provide as useful a tool as possible for a broad range of scientific applications.
A Statistical Study on Characteristics of Disappearing Prominences
Authors: Joshi Anand D. , Bong Su-Chan , Srivastava Nandita
Published: January 2014

Real-time monitoring of filaments is essential for the prediction of their eruption and the ensuing coronal mass ejection (CME). We apply an automated algorithm for the detection and tracking of filaments in full-disc Hα images to obtain their physical attributes. This provides an accurate onset time of the eruption, and also allows us to study the physical characteristics of the erupting filaments in an objective manner.
On magnetic measurements in prominences
Authors: Kim I. S. , Bugaenko O. I.
Published: January 2014

The successes of magnetic measurements in faint objects located near very bright ones are strongly depending on the stray light in the telescope. We propose a mask with a variable transmission placed on the primary optics of a telescope. Our computations of the stray light in such a telescope indicate that the calculated coronagraphic factor of improvement, K, would increase at least by 2 orders of magnitude compared to the Lyot-type coronagraph.
3D dynamical structuring of a high latitude erupting prominence: II- Analysis of the coronal context and eruption
Authors: Koutchmy Serge , Filippov Boris , Tavabi Ehsan , Bazin Cyrille , Weiller Sylvain
Published: January 2014

Both the origin of the quiescent prominences and their eruption related to CMEs event are still a matter of extended studies. The case of high latitudes quiescent prominences producing slow CMEs can be considered as a potential component of the slow wind. A high latitude prominence was observed on November 13 - 14, 2011. A schematic representation of flux rope is proposed to describe the magnetic structure of the prominence prior to its eruption.
Dynamics in the filament of september 17 2010 and in its channel
Authors: Mein Nicole , Mein Pierre , Schmieder Brigitte , Malherbe Jean-Marie , Roudier Thierry
Published: January 2014

Dynamics of a filament is investigated in Hα. Counterstreaming flows are observed along the filament. Photospheric horizontal motions have been computed by using a Coherent Structure Tracking algorithm in the filament environment.
Structure and Dynamics of an Eruptive Prominence on the Quiet Sun
Authors: Su Yingna , Reeves Katharine K. , McCauley Patrick , van Ballegooijen Adriaan A. , DeLuca Edward E.
Published: January 2014

We present preliminary results on the investigation of one polar crown prominence that erupted on 2012 March 11. This prominence is viewed at the east limb by SDO/AIA and displays a simple vertical-thread structure. A bright U-shape (double horn-like) structure is observed surrounding the upper portion of the prominence before the eruption and becomes more prominent during the eruption. When viewed on the disk, STEREO_B shows that this prominence is composed of series of vertical threads and displays a loop-like structure during the eruption. We focus on the magnetic support of the prominence by studying the structure and dynamics before and during the eruption using observations from SDO and STEREO. We will also present preliminary DEM analysis of the cavity surrounding the prominence.
Prominence Formation and Destruction
Authors: Xia Chun , Antolin Patrick , Keppens Rony
Published: January 2014

In earlier work, we demonstrated the in-situ formation of a quiescent prominence in a sheared magnetic arcade by chromospheric evaporation and thermal instability in a multi-dimensional MHD model. Here, we improve our setup and reproduce the formation of a curtain-like prominence from first principles, while showing the coexistence of the growing, large-scale prominence with short-lived dynamic coronal rain in overlying loops. When the localized heating is gradually switched off, the central prominence expands laterally beyond the range of its self-created magnetic dips and falls down along the arched loops. The dipped loops recover their initially arched shape and the prominence plasma drains to the chromosphere completely.
Coronal Multi-channel Polarimeter at the Lomnicky Peak Observatory
Authors: Schwartz P. , Ambroz J. , Gömöry P. , Kozák M. , Kučera A. , Rybák J. , Tomczyk S. , Sewell S. , Aumiller P. , Summers R. , Sutherland L. , Watt A.
Published: January 2014

Coronal Multi-channel Polarimeter (CoMP-S), developed by HAO/NCAR, has been introduced to regular operation at the Lomnicky Peak Observatory (High Tatras in northern Slovakia, 2633 m a.s.l.) of the Astronomical Institute of Slovak Academy of Sciences. We present here the technical parameters of the current version of the instrument and its potential for observations of prominences in the visual and near-IR spectral regions. The first results derived from observations of prominences in the Hα emission line taken during a coordinated observing campaign of several instruments in October 2012 are shown here.
Spectroscopic studies on naftazone and its metal complexes with analytical applications for quality control of tablets
Authors: Ibrahim Fawzia Ahmed , El-Enany Nahed Mahmoud , El-Shaheny Rania Nabih , Mikhail Ibraam Emad
Published: January 2014

The spectroscopic characteristics of the haemostatic drug naftazone as well as its metal complexing ability were investigated spectrophotometrically in order to develop new, simple and sensitive spectrophotometric methods for its determination.
Box–Behnken design applied to ultrasound-assisted extraction for the determination of polycyclic aromatic hydrocarbons in river sediments by gas chromatography/mass spectrometry
Authors: Santos Mellina D. R. , Cerqueira Marcos R. F. , de Oliveira Marcone A. L. , Matos Renato C. , Matos Maria A. C.
Published: January 2014

This paper describes the optimization of the extraction of PAHs in sediment samples from a river by applying an ultrasonic bath for quantification by GC/MS.
Synthesis and characterization of different nanostructured copper(ii) metal–organic frameworks by a ligand functionalization and modulation method
Authors: Alavi Mohammad Amin , Morsali Ali
Published: January 2014

Nanorods of {[Cu2(BDC)2(dabco)]·2DMF·2H2O} (1) and nanotubes of {[Cu2(BDC-NH2)2(dabco)]·2DMF·2H2O} (2) have been synthesized via reaction of copper(ii) acetate with terephthalic acid and aminoterephthalic acid in the presence of triethylenediamine as the pillar ligand and acetic acid as the modulator.
Stable electrocatalysts for autonomous photoelectrolysis of hydrobromic acid using single-junction solar cells
Authors: Singh N. , Mubeen S. , Lee J. , Metiu H. , Moskovits M. , McFarland E. W.
Published: January 2014

Here we demonstrate the use of a metal sulfide catalyst to extend the lifetime of a photoelectrochemical cell for electrolysis of HBr using only sunlight.
Assessment of sample preparation methods for the analysis of trace elements in airborne particulate matter
Authors: Salcedo D. , Bernal J. P. , Pérez-Arvizu O. , Lounejeva E.
Published: January 2014

A method was tested for the digestion of SRM 1648a and airborne particulate samples using acid reflux before ICP-MS analysis of trace elements. The suitability of SRM 1648(a) as a reference material for airborne PM is discussed.
Microfluidic assembly of multistage porous silicon–lipid vesicles for controlled drug release
Authors: Herranz-Blanco Bárbara , Arriaga Laura R. , Mäkilä Ermei , Correia Alexandra , Shrestha Neha , Mirza Sabiruddin , Weitz David A. , Salonen Jarno , Hirvonen Jouni , Santos Hélder A.
Published: January 2014

Thermally hydrocarbonized porous silicon microparticles are encapsulated into the aqueous cores of double emulsion lipid vesicle drops to form advanced multistage drug delivery systems.
The influence of combined magnesium and vanadate administration on the level of some elements in selected rat organs: V–Mg interactions and the role of iron-essential protein (DMT-1) in the mechanism underlying altered tissues iron level
Authors: Ścibior Agnieszka , Adamczyk Agnieszka , Gołębiowska Dorota , Niedźwiecka Irmina , Fornal Emilia
Published: January 2014

The levels of elements in rats' organs in the V–Mg interaction. A role of DMT-1 in tissue Fe homeostasis.
Use of O-carboxymethyl chitosan in high-speed counter-current chromatography: a novel additive for a biphasic solvent system
Authors: Liu Yanjuan , Wang Gaohong , Huang Xinyi , Liu Yongfeng , Di Duolong
Published: January 2014

A novel additive,O-carboxymethyl chitosan, for high-speed counter-current chromatography was found and evaluated for the separation and purification of active constituents from natural plants.
KI-catalyzed arylation of benzothiazoles from the coupling of aryl aldehydes with benzothiazoles in neat water
Authors: Gao Yuyu , Song Qiuling , Cheng Guolin , Cui Xiuling
Published: January 2014

A KI-catalyzed oxidative coupling of benzothiazoles with aryl aldehydes using TBHP as an oxidant in neat water under metal free conditions is described.
A reversible functional supramolecular material formed by host–guest inclusion
Authors: Wang Yi-Fu , Zhang Da-Li , Zhou Tao , Zhang Hong-Su , Zhang Wan-Zhen , Luo Ling , Zhang Ai-Ming , Li Bang-Jing , Zhang Sheng
Published: January 2014

A self-healing supramolecule was prepared by self-assembly of fatty acids, modified β-CD and polyethylenimine oligomer grafted ferrocene. The supramolecule behaved like macromolecules and can be used as cushioning material. An advantage is that it can be dismantled and rebuilt easily.
Renewable polyesters derived from 10-undecenoic acid and vanillic acid with versatile properties
Authors: Pang Chengcai , Zhang Jie , Wu Guolin , Wang Yinong , Gao Hui , Ma Jianbiao
Published: January 2014

A series of renewable polyesters were synthesized derived from 10-undecenoic acid and vanillic acid. An outstanding feature is that the incorporation of vanillic acid segments into the polyester backbone results in improved mechanical properties.
A facile transetherification route to polysulfone-poly(ethylene glycol) amphiphilic block copolymers with improved protein resistance
Authors: Wang Linghui , Wang Jun , Gao Xiaoying , Liang Zhiying , Zhu Baoku , Zhu Liping , Xu Youyi
Published: January 2014

A facile and versatile method to synthesize amphiphilic polysulfone-poly(ethylene glycol) block copolymers has been successfully developed via a macromolecular transetherification reaction at room temperature.
Physicochemical characterization and catalytic CO oxidation performance of nanocrystalline Ce–Fe mixed oxides
Authors: Sudarsanam Putla , Mallesham Baithy , Durgasri D. Naga , Reddy Benjaram M.
Published: January 2014

Fe-doped CeO2 nano-oxide exhibited superior CO oxidation activity compared to pristine CeO2 due to its facile reducible nature, enhanced lattice strain, and ample oxygen vacancies.
Synthesis and biological evaluation of oleanolic acid derivative–chalcone conjugates as α-glucosidase inhibitors
Authors: Tang Chu , Zhu Linhui , Chen Yu , Qin Rui , Mei ZhiNan , Xu Jing , Yang Guangzhong
Published: January 2014

Series of oleanolic acid derivative–chalcone conjugates were designed, synthesized and their α-glucosidase inhibitory activities were investigatedin vitro.
Scaling-up the production of recombinant Moringa oleifera coagulant protein for large-scale water treatment applications
Authors: Pavankumar Asalapuram Ramachandran , Norén Johan , Singh Lakhvinder , Chandappa Gowda Naveen Kumar
Published: January 2014

Scaling-up the production of Moringa oleifera coagulant protein to industrial level reveals it multiple advantages over the usage of chemical disinfectants and serves as a natural remedy for water treatment processes.
Exploring structural requirements of leads for improving activity and selectivity against CDK5/p25 in Alzheimer's disease: an in silico approach
Authors: Ambure Pravin , Roy Kunal
Published: January 2014

A congeneric series of 224 cyclin-dependant kinase 5/p25 (CDK5/p25) inhibitors was exploited to understand the structural requirements for improving activity against CDK5/p25 and selectivity over CDK2.
Metabonomics study on nephrotoxicity induced by intraperitoneal and intravenous cisplatin administration using rapid resolution liquid chromatography coupled with quadrupole-time-of-flight mass spectrometry (RRLC-Q-TOF-MS)
Authors: Li Yubo , Zhang Xiuxiu , Zhou Huifang , Fan Simiao , Wang Yuming , Zhang Lu , Ju Liang , Wu Xin , Wu Huanyu , Zhang Yanjun
Published: January 2014

Metabonomics was used to find characteristics of nephrotoxicity induced by IP or IV injection of cisplatin.
Controllable growth of graphene/Cu composite and its nanoarchitecture-dependent electrocatalytic activity to hydrazine oxidation
Authors: Liu Chengbin , Zhang Hang , Tang Yanhong , Luo Shenglian
Published: January 2014

Three architectures are achieved for a graphene/Cu nanocomposite using one-step cyclic voltammetric electrodeposition which show distinct architecture-dependent electrocatalytic performances.
Ethanol-assisted hydrothermal synthesis of LiNi0.5Mn1.5O4 with excellent long-term cyclability at high rate for lithium-ion batteries
Authors: Xue Yuan , Wang Zhenbo , Yu Fuda , Zhang Yin , Yin Geping
Published: January 2014

LiNi0.5Mn1.5O4, synthesized by an ethanol-assisted hydrothermal method, showed excellent rate performance and stable long-term cyclability.
Porous magnetic carbon sheets from biomass as an adsorbent for the fast removal of organic pollutants from aqueous solution
Authors: Zhang Shouwei , Zeng Meiyi , Li Jiaxing , Li Jie , Xu Jinzhang , Wang Xiangke
Published: January 2014

Carbon-stabilized Fe/Fe3C nanoparticles with excellent adsorption capacity for dyes were fabricated through a facile in situ synthetic strategy.
Soft templated mesoporous manganese oxide/carbon nanotube composites via interfacial surfactant assembly
Authors: Lee Chang-Wook , Yoon Seung-Beom , Bak Seong-Min , Han Joah , Roh Kwang Chul , Kim Kwang-Bum
Published: January 2014

A mesoporous manganese oxide/carbon nanotube composite was successfully synthesized via interfacial surfactant assembly. The electrochemical utilization of MnO2 was greatly improved due to the synergetic effect of the mesoporous structure and the CNTs.
Development of a D–π–A dye with benzothienopyridine as the electron-withdrawing anchoring group for dye-sensitized solar cells
Authors: Ooyama Yousuke , Sato Takafumi , Harima Yutaka , Ohshita Joji
Published: January 2014

A D–π–A dye SAT-1 with benzo[4,5]thieno[2,3-c]pyridine as the electron-withdrawing anchoring group capable of forming a hydrogen bond or a coordinate bond on a TiO2 surface was developed as a new-type of D–π–A dye sensitizer for dye-sensitized solar cells.
13C NMR aided design of molecularly imprinted adsorbents for selectively preparative separation of erythromycin
Authors: Zhang Yuxin , Qu Xue , Yu Jinpeng , Xu Liancai , Zhang Zhiqiang , Hong Hua , Liu Changsheng
Published: January 2014

Based on the 13C chemical shift changes, the optimal monomer of MAA was selected and the rational binding sites were predicted. The resultant materials show good selectivity for erythromycin.
Multisite phosphorylation of 14-3-3 proteins by calcium-dependent protein kinases
Authors: Swatek Kirby N. , Wilson Rashaun S. , Ahsan Nagib , Tritz Rebecca L. , Thelen Jay J.
Published: January 2014

Plant 14-3-3 proteins are phosphorylated at multiple sites in vivo; however, the protein kinase(s) responsible are unknown. Of the 34 CPK (calcium-dependent protein kinase) paralogues in Arabidopsis thaliana, three (CPK1, CPK24 and CPK28) contain a canonical 14-3-3-binding motif. These three, in addition to CPK3, CPK6 and CPK8, were tested for activity against recombinant 14-3-3 proteins χ and ε. Using an MS-based quantitative assay we demonstrate phosphorylation of 14-3-3 χ and ε at a total of seven sites, one of which is an in vivo site discovered in Arabidopsis. CPK autophosphorylation was also comprehensively monitored by MS and revealed a total of 45 sites among the six CPKs analysed, most of which were located within the N-terminal variable and catalytic domains. Among these CPK autophosphorylation sites was Tyr463 within the calcium-binding EF-hand domain of CPK28. Of all CPKs assayed, CPK28, which contained an autophosphorylation site (Ser43) within a canonical 14-3-3-binding motif, showed the highest activity against 14-3-3 proteins. Phosphomimetic mutagenesis of Ser72 to aspartate on 14-3-3χ, which is adjacent to the 14-3-3-binding cleft and conserved among all 14-3-3 isoforms, prevented 14-3-3-mediated inhibition of phosphorylated nitrate reductase.
Quantum Markovian master equation for scattering from surfaces
Authors: Li Haifeng , Shao Jiushu , Azuri Asaf , Pollak Eli , Alicki Robert
Published: January 2014

We propose a semi-phenomenological Markovian Master equation for describing the quantum dynamics of atom-surface scattering. It embodies the Lindblad-like structure and can describe both damping and pumping of energy between the system and the bath. It preserves positivity and correctly accounts for the vanishing of the interaction of the particle with the surface when the particle is distant from the surface. As a numerical test, we apply it to a model of an Ar atom scattered from a LiF surface, allowing for interaction only in the vertical direction. At low temperatures, we find that the quantum mechanical average energy loss is smaller than the classical energy loss. The numerical results obtained from the space dependent friction master equation are compared with numerical simulations for a discretized bath, using the multi-configurational time dependent Hartree methodology. The agreement between the two simulations is quantitative.
Mixed brush of chemically and physically adsorbed polymers under shear: Inverse transport of the physisorbed species
Authors: Pastorino C. , Müller M.
Published: January 2014

We study mixed brushes under shear flow by molecular dynamics simulation with an explicit solvent. The primary brush is formed by chemically grafting polymers to a solid substrate, the secondary brush is comprised of shorter, physically end-adsorbed molecules that can laterally diffuse. By virtue of the immobility of the grafted end-points of the primary brush, its individual macromolecules perform a cyclic motion. If there is a well defined solvent-brush interface, this cyclic motion of the primary brush molecules will collectively result in the reversal of the flow inside of the primary brush. This backflow, linear in the shear rate, gives rise to the transport of the shorter, physically end-adsorbed molecules in the opposite direction of the solvent flow. We discuss which conditions are necessary to observe this counter-intuitive phenomenon. Comparing Poiseuille and Couette flow we demonstrate that the magnitude of the local shear rate at the brush-liquid interface dictates the cyclic motion and concomitant inversion of transport but that these universal effects are independent of the type of driving the flow.
Fabricating superconducting interfaces between artificially grown LaAlO3 and SrTiO3 thin films
Authors: Li Danfeng , Gariglio Stefano , Cancellieri Claudia , Fête Alexandre , Stornaiuolo Daniela , Triscone Jean-Marc
Published: January 2014

Realization of a fully metallic two-dimensional electron gas (2DEG) at the interface between artificially grown LaAlO3 and SrTiO3 thin films has been an exciting challenge. Here we present for the first time the successful realization of a superconducting 2DEG at interfaces between artificially grown LaAlO3 and SrTiO3 thin films. Our results highlight the importance of two factors—the growth temperature and the SrTiO3 termination. We use local friction force microscopy and transport measurements to determine that in normal growth conditions the absence of a robust metallic state at low temperature in the artificially grown LaAlO3/SrTiO3 interface is due to the nanoscale SrO segregation occurring on the SrTiO3 film surface during the growth and the associated defects in the SrTiO3 film. By adopting an extremely high SrTiO3 growth temperature, we demonstrate a way to realize metallic, down to the lowest temperature, and superconducting 2DEG at interfaces between LaAlO3 layers and artificially grown SrTiO3 thin films. This study paves the way to the realization of functional LaAlO3/SrTiO3 superlattices and/or artificial LaAlO3/SrTiO3 interfaces on other substrates.