cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.57780/esa-ytgm7q5
title: 16899

description: PG 0043+039 is the most X-ray weak quasar known to date. Marginally detected in 2005 comma  an XMM- Newton observation in 2013 set a clear detection im- plying a flux increase of at least a factor 3.8. Simulta- neous observations at other wavelengths showed the quasar still extreme X-ray weak comma  with a peculiar spec- tral energy distribution (SED) and unique features in the UV spectrum. We propose that PG 0043+039 is a genuine X-ray weak quasar. To probe this hy- pothesis and to test alternative emission scenarios (ADAFs comma  missing corona (Ricci et al. comma  2020 ApJ 898 comma  L1) comma  cyclotron-emission (Kollatschny et al. 2015 comma  A and A comma  577 comma  L1)) this unique source deserves further comma  deeper comma  observations comma  aiming to establish its X-ray spectrum comma  its optical to hard X-ray SED and new con- straints on its variability. Our proposal is to observe PG 0043+039 quasi-simultaneously (2 days) with XMM-Newton (100ks + 20ks) comma  NuSTAR (60ks) and HST (2 orbits). We will arrange quasi-simultaneous observations with the ground 10m Hobby-Eberly Telescope in Texas and with the 10m SALT Telescope in South Africa.
DOI: 10.57780/esa-yu35opa
title: 16823

description: The Space Telescope Science Institute (STScI) Director has decided to devote up to 1000 orbits of Director.s Discretionary time in observing Cycles 27-29 to a new Hubble Ultraviolet Legacy program focused on star formation and associated stellar physics. This new program comma  ULLYSES (UV Legacy Library of Young Stars as Essential Standards) comma  will provide a UV spectroscopic reference sample of young (< 10 Myr) high- and low-mass stars. It will target over virgul150 OB stars in the Magellanic Clouds and lower metallicity galaxies in the Local Group comma  and virgul40 T Tauri stars and brown dwarfs in the Milky Way. In addition comma  ULLYSES will monitor 4 typical T Tauri stars over different rotational phases through at least three rotation periods comma  and over timescales of months to years. The resulting library will provide template spectra of massive stars at metallicities substantially below the well studied comma  while the low mass sample will cover a wide range of ages comma  accretion rates comma  and masses comma  including objects down to well below 0.5 M_sun. The legacy of this large UV dataset on the first 10 Myr of stellar evolution will be enhanced by complementary datasets obtained by the scientific community. In addition to the core goals of the program related to stellar astrophysics of low and high mass stars comma  this data will also enable exciting science in the fields of ISM comma  CGM comma  jets comma  and exoplanets. ULLYSES will be modeled after the Frontier Fields programdoublePoint all data obtained will be non-proprietary. The implementation team at STScI is developing high-level science data products and a sophisticated database and website for disseminating data from the ULLYSES program and ancillary datasets for the ULLYSES target sample from space and ground-based facilities.
DOI: 10.15156/bio/sh1284323.09fu
title: SH1284323.09FU

description: UNITE provides a unified way for delimiting, identifying, communicating, and working with DNA-based Species Hypotheses (SH). All fungal ITS sequences in the international nucleotide sequence databases are clustered to approximately the species level by applying a set of dynamic distance values (<0.5 - 3.0%). All species hypotheses are given a unique, stable name in the form of a DOI, and their taxonomic and ecological annotations are verified through distributed, web-based third-party annotation efforts. SHs are connected to a taxon name and its classification as far as possible (phylum, class, order, etc.) by taking into account identifications for all sequences in the SH. An automatically or manually designated sequence is chosen to represent each such SH. These sequences are released (https://unite.ut.ee/repository.php) for use by the scientific community in, for example, local sequence similarity searches and next-generation sequencing analysis pipelines. The system and the data are updated automatically as the number of public fungal ITS sequences grows.
DOI: 10.57780/esa-yvzxsq2
title: 16746

description: Resolved observations of the stellar halos of nearby galaxies yield critical insight into the mass assembly history in these systems comma  allowing the predictions of cosmological models to be directly confronted with experimental data. Andromeda (M31) is a key location for this endeavour comma  offering a second data point comma  and exhibiting strikingly different halo properties comma  to the Milky Way. Here we propose to take the first step towards obtaining full 6D orbital phase-space information for stellar substructures in the M31 halo comma  by undertaking a pilot survey to measure proper motions for a small set of globular clusters with first-epoch ACS-WFC imaging taken 11-17 years ago. By comparison with recent HST proper motion studies of larger stellar systems out to the distance of M31 comma  we expect to achieve a precision of virgul0.010-0.015 mas-yr with these baselines. This compares favourably with the observed 1D (line-of-sight) kinematics of M31.s outer globular cluster system comma  which exhibit a velocity dispersion of virgul100 km-s (0.027 mas-yr) plus coherent rotation of comparable amplitude. These pilot measurements will provide the first 6D phase-space information for any extragalactic stellar stream comma  and enable a new comma  independent estimate of the shape and mass of the M31 dark halo at very large radii (50-120 kpc). By demonstrating feasibility and optimising our methodology with this data set comma  we ultimately aim to extend similar measurements to a much larger cluster sample in future comma  facilitating detailed orbital modelling that will accurately reconstruct the main events in M31.s accretion history.
DOI: 10.57780/esa-yw4n2uq
title: 16339

description: Obtain darks at GAIN=1 in order to monitor CCD behavior and chart growth of hot and bad pixels as part of the STIS CCD Dark Monitor.
DOI: 10.15156/bio/sh1284324.09fu
title: SH1284324.09FU

description: UNITE provides a unified way for delimiting, identifying, communicating, and working with DNA-based Species Hypotheses (SH). All fungal ITS sequences in the international nucleotide sequence databases are clustered to approximately the species level by applying a set of dynamic distance values (<0.5 - 3.0%). All species hypotheses are given a unique, stable name in the form of a DOI, and their taxonomic and ecological annotations are verified through distributed, web-based third-party annotation efforts. SHs are connected to a taxon name and its classification as far as possible (phylum, class, order, etc.) by taking into account identifications for all sequences in the SH. An automatically or manually designated sequence is chosen to represent each such SH. These sequences are released (https://unite.ut.ee/repository.php) for use by the scientific community in, for example, local sequence similarity searches and next-generation sequencing analysis pipelines. The system and the data are updated automatically as the number of public fungal ITS sequences grows.
DOI: 10.57780/esa-yxgcjsd
title: 16178

description: We propose to obtain a series of three early-time UV spectra of one stripped-envelope core-collapse supernova (either a normal SN Ib or a normal SN Ic) comma  starting well before maximum brightness. The underlying nature of these objects comma  from the mass-loss process stripping the envelope to the details of the explosion mechanism comma  remain mysterious. Connections to gamma-ray bursts and X-ray flashes further motivate this study. Many high-redshift SNe are being found in deep transient surveys comma  but the ability to distinguish between thermonuclear Type Ia SNe and stripped-envelope core-collapse SNe requires thorough knowledge of the latter at UV wavelengths with a low-z object. By comparing the evolution of the spectra as the photosphere recedes to deeper layers of the ejecta with our time series of spectral models comma  we will gain a better understanding of the explosion mechanism and the degree of mixing during the explosion. Moreover comma  we should be able to determine the metal content of the progenitor.s outer layers with our spectral models and compare with the measured metallicity of the environment. The heterogeneity seen in stripped-envelope SNe compels us to choose a normal SN Ib or SN Ic comma  objects with DIFFERENT characteristics than the ones that HST has observed in previous Cycles (SNe Ic-pec comma  IIb comma  Ibn) comma  thereby gaining further insights into this unique class of cosmic explosion. We need to seize this opportunity now comma  while we have access to the space UV comma  and indeed the UV is an HST Cycle 28 priority.
DOI: 10.57780/esa-yzl6rcx
title: 16880

description: HST observations taken less than a month before the Mid-Cycle deadline show that a secondary dark feature has appeared on Neptune comma  closer to the equator than the main dark vortex known as NDS-2018. We propose deep imaging in the F467M filter that is ideal for detecting dark features comma  which cannot be seen at infrared wavelengths  only HST has the short wavelength spatial resolution capable of observing these spots. New observations are needed to constrain the evolution of NDS-2018 and the recently-discovered secondary dark feature comma  given the limited information currently available on these storms. Results from the proposed study would constrain future modeling efforts and lay groundwork for potential Neptune spacecraft missions in the coming decades.  Infrared JWST observations of Neptune in 2022 will be blind to NDS-2018 and any secondary dark features comma  but the JWST observations are intended to characterize any localized compositional or thermal anomalies associated with storms or other discrete features. The proposed HST observations would enhance the interpretation of JWST data by showing whether NDS-2018 is still present at the time of the JWST observations comma  and whether any secondary dark features (either localized or global-scale) are present.  We seek to explore five key questionsdoublePoint What is the dynamical nature of secondary dark featuresquestionMark How do secondary dark features influence the north-south migration of the dark vortexquestionMark What does vortex migration tell us about the background atmospherequestionMark Are Jupiter-Saturn vortices different from Neptune.s dark spotsquestionMark What global-scale effects are produced by dark vorticesquestionMark
DOI: 10.15156/bio/sh1284325.09fu
title: SH1284325.09FU

description: UNITE provides a unified way for delimiting, identifying, communicating, and working with DNA-based Species Hypotheses (SH). All fungal ITS sequences in the international nucleotide sequence databases are clustered to approximately the species level by applying a set of dynamic distance values (<0.5 - 3.0%). All species hypotheses are given a unique, stable name in the form of a DOI, and their taxonomic and ecological annotations are verified through distributed, web-based third-party annotation efforts. SHs are connected to a taxon name and its classification as far as possible (phylum, class, order, etc.) by taking into account identifications for all sequences in the SH. An automatically or manually designated sequence is chosen to represent each such SH. These sequences are released (https://unite.ut.ee/repository.php) for use by the scientific community in, for example, local sequence similarity searches and next-generation sequencing analysis pipelines. The system and the data are updated automatically as the number of public fungal ITS sequences grows.
DOI: 10.57780/esa-z3ys4ge
title: 16786

description: A precise accounting for interstellar dust is required to interpret the energy output of galaxies. However comma  our current understanding for how fundamental properties of dust grains vary between interstellar environments is severely limited. Furthermore comma  our best constraints for how galaxies beyond the Milky Way convert the dusty ISM into stars and planets are based on coarsely-calibrated star formation histories of local systems with unconstrained line-of-sight geometries. To tackle these glaring problems comma  we propose to conduct a pure-parallel comma  multi-band imaging program with Wide Field Camera 3 (WFC3) to complement the upcoming Hubble Space Telescope (HST) Ultraviolet (UV) Legacy library of Young Stars as Essential Standards (ULLYSES) survey. ULLYSES will observe massive stars in the Large and Small Magellanic Clouds (LMC comma  SMC) and other low-metallicity local galaxies. Our multi-band program comma  Scylla (named after the multi-headed comma  monstrous foe of Ulysses) comma  will target random parallel fields of ULLYSES targets with WFC3 in photometric bands spanning the UV to the near infrared (NIR). We willdoublePoint (1) map the extinction curve and dust grain properties at high resolution in a diverse range of interstellar conditions  (2) constrain the multi-dimensional structure of gas in the LMC and SMC  and (3) measure the comprehensive star formation and chemical enrichment histories of nearby dwarf galaxies. The result will be an unprecedented view of star formation in the dusty ISM.
DOI: 10.15156/bio/sh1284326.09fu
title: SH1284326.09FU

description: UNITE provides a unified way for delimiting, identifying, communicating, and working with DNA-based Species Hypotheses (SH). All fungal ITS sequences in the international nucleotide sequence databases are clustered to approximately the species level by applying a set of dynamic distance values (<0.5 - 3.0%). All species hypotheses are given a unique, stable name in the form of a DOI, and their taxonomic and ecological annotations are verified through distributed, web-based third-party annotation efforts. SHs are connected to a taxon name and its classification as far as possible (phylum, class, order, etc.) by taking into account identifications for all sequences in the SH. An automatically or manually designated sequence is chosen to represent each such SH. These sequences are released (https://unite.ut.ee/repository.php) for use by the scientific community in, for example, local sequence similarity searches and next-generation sequencing analysis pipelines. The system and the data are updated automatically as the number of public fungal ITS sequences grows.
DOI: 10.57780/esa-z479jfk
title: 16702

description: One of the most exciting results in modern cosmology has been the discovery of the accelerated expansion of the Universe. It could be due to an V1.0 energy component (i.e. comma  dark energy) or the modification of general relativity. In order to illuminate the V1.0 nature of the observed cosmic acceleration comma  ESA.s Euclid and NASA.s Roman Space Telescopes will be launched in 2022 and virgul2026 respectively. They will complement each other in probing cosmic acceleration with high precision and accuracy comma  and need tight requirements on spectrophotometry to unprecedented accuracy. Accurate absolute spectrophotometry is vital to determine the fraction of baryonic matter turned into stars comma  for galaxy and supernovae surveys comma  and to enable legacy science. Extreme care must be taken to control systematic errors and biases. We propose to establish six hot White Dwarfs as stable comma  spectrophotometric IR standards for use by Euclid and Roman. The targets are suitable for spectrophotometry with the WFC3-IR grisms comma  and chosen to lie near both ecliptic poles within the Euclid and Roman CVZ. This allows for year-round accessibility. The stars lie within two planned comma  frequently repeated comma  Euclid deep fields comma  and in a likely location to be observed by Roman for calibration purposes.  Although not formally an HST calibration proposal comma  our 11-orbit program will be vital in tying Euclid-Roman deep field spectra of faint galaxies to well-calibrated HST standards. It will also cross-calibrate the spectrophometry to broad-band IR colors of these faint high ecliptic-latitude sources. This proposed program is of critical importance to the successful calibration of both Euclid and Roman.
DOI: 10.57780/esa-z57dxtp
title: 16502

description: The remnants of planetary systems that survived the metamorphosis of their host stars into white dwarfs are identified in the form of compact debris disks comma  formed from the tidal disruption of planetesimals. These disks are detectable as IR flux excess comma  and comma  in rare occasions comma  as metallic emission lines from a gaseous disk component in optical spectra. These gaseous disks are thought to host embedded solid fragments comma  maybe the core comma  of the disrupted planetesimal comma  and represent ideal targets for joint ultraviolet comma  optical and infrared observations that provide unrivalled insight into the formation of these disks comma  the nature of the disrupting planetesimal comma  the elemental abundances of the planetary debris comma  and its mineralogical make-up. Here comma  we propose COS far-ultraviolet spectroscopy of a new comma  bright comma  and nearby gaseous disk system that we identified in December 2020 comma  to measure the elemental abundances of the planetary material. The far-ultraviolet wavelength range is critically important to access transitions of core (Fe comma  Ni) comma  mantle (Si comma  Mg comma  O) comma  and crust (Ca comma  Al) comma  as well as volatiles (C comma  N comma  S comma  P) species that have no transitions at optical wavelengths comma  or are contaminated by the disk emission lines. This system is also a prime target for JWST Cycle 2 MIRI spectroscopy of the circumstellar dust comma  and this mid-cycle program will ensure that the composition of the debris is known well in time for the next JWST proposal round.
DOI: 10.15156/bio/sh1284327.09fu
title: SH1284327.09FU

description: UNITE provides a unified way for delimiting, identifying, communicating, and working with DNA-based Species Hypotheses (SH). All fungal ITS sequences in the international nucleotide sequence databases are clustered to approximately the species level by applying a set of dynamic distance values (<0.5 - 3.0%). All species hypotheses are given a unique, stable name in the form of a DOI, and their taxonomic and ecological annotations are verified through distributed, web-based third-party annotation efforts. SHs are connected to a taxon name and its classification as far as possible (phylum, class, order, etc.) by taking into account identifications for all sequences in the SH. An automatically or manually designated sequence is chosen to represent each such SH. These sequences are released (https://unite.ut.ee/repository.php) for use by the scientific community in, for example, local sequence similarity searches and next-generation sequencing analysis pipelines. The system and the data are updated automatically as the number of public fungal ITS sequences grows.
DOI: 10.57780/esa-z6khn0q
title: 17218

description: The origin of the stellar and brown dwarf Initial Mass Function (IMF) and whether it is universal are major open questions in modern astrophysics comma  impacting our understanding of the star formation process and interpretation of mass to light ratios of unresolved stellar populations. Of particular interest is whether the IMF changes with metallicity comma  especially at low metallicities comma  which would be conditions applicable for the early Universe. Star-forming regions near the Sun all have close to solar metallicity and are thus not useful for this experiment. The Magellanic Clouds are significantly sub-solar in metallicity comma  but are too distant for current telescopes and instrumentation to reach below 0.25 Msun where the Galactic field IMF peaks. Here we propose to target forming star clusters within Sh2-284 comma  one of the most metal-poor HII regions in the outer Galaxy. WFC3.s combination of high spatial resolution comma  efficient mosaicing possibilities and access to target water absorption bands makes it ideal to map the full area of the clusters and to derive effective temperatures for the low-mass young stellar objects (YSOs) comma  allowing them to be placed in the HR diagram and field star contamination eliminated. With a clean sample of low-mass objects down to 50 Jupiter masses comma  this study will yield the most comprehensive statistics of the low-mass IMF in low-metalliicity region to date comma  enabling a detailed comparison with local field and solar-metallicity cluster IMFs. Our proposed observations have joint coverage with one cluster to be observed with JWST comma  which will enable cross calibration of YSO characterization methods between these facilities.
DOI: 10.15156/bio/sh1284328.09fu
title: SH1284328.09FU

description: UNITE provides a unified way for delimiting, identifying, communicating, and working with DNA-based Species Hypotheses (SH). All fungal ITS sequences in the international nucleotide sequence databases are clustered to approximately the species level by applying a set of dynamic distance values (<0.5 - 3.0%). All species hypotheses are given a unique, stable name in the form of a DOI, and their taxonomic and ecological annotations are verified through distributed, web-based third-party annotation efforts. SHs are connected to a taxon name and its classification as far as possible (phylum, class, order, etc.) by taking into account identifications for all sequences in the SH. An automatically or manually designated sequence is chosen to represent each such SH. These sequences are released (https://unite.ut.ee/repository.php) for use by the scientific community in, for example, local sequence similarity searches and next-generation sequencing analysis pipelines. The system and the data are updated automatically as the number of public fungal ITS sequences grows.
DOI: 10.57780/esa-zbyeqqp
title: 17013

description: The gain is the conversion factor from electronic analog digital units (ADUs) to electrons and so is a fundamental parameter needed to characterize the WFC3 IR detector. In order to ensure that the true value in each quadrant does not deviate significantly from the nominal gain setting of 2.5 e--ADU within the WFC3-IR data reduction pipeline comma  the gain must be monitored each cycle. We propose an observing program for the IR channel of WFC3 that will measure the gain in each of the four quadrants of the detector with a series of flat field pairs taken no more than a week apart comma  performed first in winter 2021-22 and again in summer 2022. For each quadrant of each ramp pair comma  the measured mean signal is plotted against the variance. The gain is the inverse of the slope of the best fit line.  This proposal is an identical continuation of Cycle 29.s program 16577.  Ramp pairs are taken twice a year comma  providing two separate calculations of gain each cycle.
DOI: 10.15156/bio/sh1284329.09fu
title: SH1284329.09FU

description: UNITE provides a unified way for delimiting, identifying, communicating, and working with DNA-based Species Hypotheses (SH). All fungal ITS sequences in the international nucleotide sequence databases are clustered to approximately the species level by applying a set of dynamic distance values (<0.5 - 3.0%). All species hypotheses are given a unique, stable name in the form of a DOI, and their taxonomic and ecological annotations are verified through distributed, web-based third-party annotation efforts. SHs are connected to a taxon name and its classification as far as possible (phylum, class, order, etc.) by taking into account identifications for all sequences in the SH. An automatically or manually designated sequence is chosen to represent each such SH. These sequences are released (https://unite.ut.ee/repository.php) for use by the scientific community in, for example, local sequence similarity searches and next-generation sequencing analysis pipelines. The system and the data are updated automatically as the number of public fungal ITS sequences grows.