cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.57780/esa-snep56o
title: 17157

description: Lyman-alpha transits provide a window into atmospheric escape comma  a process that has observably shaped the exoplanet population. However comma  mass loss estimates from these observations are highly model dependent. A recently predicted feature of hot Jupiter transits could begin dismantling this model dependencedoublePoint the delayed transit of the outflow tail. These transits have been hiding in plain sight comma  just slightly beyond the primary transits sampled by past Lyman-alpha transit observations. Critically comma  the plasma causing this delayed transit will have reached ionization equilibrium. Knowing the plasma.s ionization state eliminates a confounding factor from the interpretation of the transit signal comma  enabling a stronger link between the the observations and the rate and efficiency of the planet.s mass loss. This program will observe the delayed transit from the outflow tail of HD 189733 b comma  a planet with a well-established primary Lyman-alpha transit. The outcome will be an improved measurement of HD 189733 b.s mass loss rate and efficiency comma  with broader implications for mass loss across the population of exoplanets.
DOI: 10.57780/esa-soe8suh
title: 16756

description: The existence of luminous quasars hosting supermassive black holes (SMBHs) within the first billion years of cosmic history challenges our understanding of black hole growth. However comma  much of our understanding relies on the assumption that the observed luminosities are intrinsic to the quasars themselves. It has long been predicted that a large fraction of high-redshift quasars should be gravitationally lensed comma  but to date only one lensed quasar above z>5 has been confirmed despite considerable observational efforts. We propose to search for this long sought-after population of lensed quasars with HST-ACS comma  targeting six objects at zvirgul6 whose rest-frame UV spectra exhibit exceptionally small proximity zones. These quasars are excellent candidates for being gravitationally lensed objects comma  because the local ionizing flux implied by their small proximity zones is far below the expectation from their observed UV luminosities. We aim to apply a two-fold observing strategy using imaging both in the near-IR to search for multiple quasar images comma  as well as in the optical regime to target foreground lensing galaxies using the intergalactic medium as a natural long-pass filter to avoid the quasar light comma  in order to improve the success rate of this lensing search. In case we do not find evidence for lensing comma  the quasars. small proximity zones could be explained by very short UV-luminous lifetimes of less than 10 comma 000 years comma  requiring either super-Eddington accretion rates or highly obscured black hole growth phases comma  in order to explain the concomitant SMBH growth. Thus either outcome of our proposed observations promises new insights into the formation and growth of the first SMBHs.
DOI: 10.15156/bio/sh1284249.09fu
title: SH1284249.09FU

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-soj0zq4
title: 16368

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/sh1284250.09fu
title: SH1284250.09FU

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-sshbebz
title: 16365

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: 10.57780/esa-ssq7szw
title: 16304

description: Recent high-precision and high-cadence space-based missions have used asteroseismology to dig deep to the cores of low-mass stars and determine their internal properties. Much of the metals produced throughout the history of the Universe are forged deep in the cores of massive stars comma  but astonishingly little is known about the core properties of the most massive stars. Recent TESS observations found stochastic variations of blue supergiants that could be the long-sought signal of internal gravity waves near the convective cores of massive stars. These oscillations may revolutionize our understanding of the cores of the most massive stars comma  but winds from the same stars vary with similar periods and patterns as these stochastic oscillations. Here comma  we propose a 26 orbit HST-STIS E140M time-series of the stellar winds from one blue LMC supergiant comma  SK-67 166 comma  which is observed to have stochastic oscillations on 0.5 day periods and has a rotation rate of 4 days. This proposed time-series will be concurrent with future TESS observations comma  have the same cadence as TESS comma  and have a total baseline of 10 days to determine whether the TESS oscillations correspond to changes in the stellar winds or result from internal gravity waves. If the stochastic oscillations are confirmed to be due to internal gravity waves comma  high-cadence observations and asteroseismology models can determine the interior properties of the most massive stars. If the TESS oscillations are in phase with the stellar wind variations comma  TESS can determine crucial properties of the elusive stellar winds. Either outcome will dramatically impact our view of the massive stars that drive galactic and chemical evolution.
DOI: 10.57780/esa-stjgxop
title: 17202

description: We propose multi-epoch STIS FUV spectroscopy of the only Be star + black hole binary candidate comma  MWC 656. These observations will reveal the nature of the Be star.s elusive companiondoublePoint a black hole comma  or an intermediate-mass (virgul3 Msun) stripped helium star. Either scenario would be extraordinarydoublePoint intermediate-mass stripped stars are the main progenitors of stripped-envelope supernovae comma  X-ray binaries comma  and merging neutron stars comma  yet they have remained elusive for decades  the black hole would be in the mass gap and would be the only known X-ray faint high-mass X-ray binary containing a black hole. Our proposed observations will unambiguously distinguish between these two scenarios comma  as the UV spectrum of a massive stripped star will be very different from that of a black hole accretion disk. FUV spectra will also constrain the spectral type comma  mass comma  and RV variability of the Be star more reliably than has been possible with optical data comma  which are strongly contaminated by the Be star.s circumstellar disk.
DOI: 10.15156/bio/sh1284251.09fu
title: SH1284251.09FU

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-sufl816
title: 16829

description: This program uses the deuterium lamp to illuminate the regions of the detector being used to collect spectra during Cycle 29. The data obtained will be used to create gain maps of the detector. Because of the strongly varying intensity of the lamp as a function of wavelength comma  G130M-1309 data will be obtained for Segment A comma  and G160M-1600 will be used for Segment B.  Gain map data will be obtained at virgul6 month intervals for modes where the voltage is unchanged. Obtaining a gain map at these times will help to improve the modeling of the modal gain as a function of time and extracted charge comma  since it will provide data that cover the full time span of each high voltage at each LP. Improving these models will allow better predictions of the future lifetime of the detector.
DOI: 10.57780/esa-suxv3gm
title: 16280

description: The goal of this project is to probe the nature and origin of the Hilda asteroids comma  a population of small bodies with orbits in stable mean-motion resonance with Jupiter. We will accomplish this objective by observing and characterizing the physical properties of quasi-Hilda objects comma  an unstable population hidden among the Hildas.We selected observational targets based on the dynamical study of objects close to Hilda region. Our analysis show that these quasi-Hilda objects are probable Centaur interlopers that migrated inward comma  temporally residing near the Hildas. We will monitor these objects for low-level activity and acquire their optical colors. Comparison between properties of these groups will provide valuable information about the surface of evolution of Centaurs when placed in a Hilda environment comma  which will enable us to distinguish if Hildas and Centaurs can share a similar origin comma  as proposed by dynamical models for the formation and evolution of the solar system.
DOI: 10.15156/bio/sh1284252.09fu
title: SH1284252.09FU

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-svfsd7k
title: 17010

description: Due to damage to the silicon lattice of the UVIS CCD chips over time comma  the charge transfer efficiency (CTE) of the UVIS camera degrades comma  impacting science and calibration observations. A way to slow the impact of CTE loss is by applying a pixel-based CTE correction. Such a correction requires an algorithm that can identify and locate traps that are responsible for charge loss. This program will locate and characterize these charge traps comma  map their distribution across the CCD chips comma  and monitor the trap population growth over time.  Previous programsdoublePoint 12693 comma  13084 comma  13569 comma  14013 comma  14379 comma  14542 comma  14991 comma  15577 comma  15722 comma  16402 comma  16574
DOI: 10.15156/bio/sh1284253.09fu
title: SH1284253.09FU

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-svm6hgv
title: 16212

description: The extremely luminous comma  fast comma  hot transient AT2018cow has provoked a reconsideration in our view of the transient sky.  This event comma  by far the nearest example of the class of fast-rising luminous transients (sometimes referred to as FBOTs or FELTs) comma  displayed an array of peculiar properties that highly strain theoretical models for what is possible in a supernova explosion.  For all their peculiarities comma  however comma  fast-rising transients are not rare in a volumetric sense - and with ZTF and ATLAS both obtaining high-cadence observations of wide areas of the northern sky it is probable that another such event will be observed in the coming year.  These are primarily ultraviolet phenomena comma  and UV spectroscopy has the power to reveal similarities or differences betwen this event and other known varieties of transient (including young CCSNe comma  superluminous SNe comma  and TDEs) that are not apparent in optical observations alone comma  and to discover (or rule out) the presence of a dense stellar wind around the progenitor.  We propose to obtain target-of-opportunity UV spectroscopy of another event of this type in Cycle 28 to critically evaluate these links and secure the physical origins of this class while HST.s unique UV spectroscopic resource is still available.
DOI: 10.57780/esa-t2d4yd6
title: 16192

description: We propose to closely follow the expected re-activation of the unusual binary main-belt comet 288P (300163) in the fall of 2021 comma  to identify the active component(s). This is a crucial parameter to understand the formation and evolution of this system which is unique among the known binary asteroids both because of its comet-like activity and because of its wide comma  eccentric and asynchronous mutual orbit in combination with similarly sized components. We request a total of 8 orbits. Seven orbits comma  distributed across one month comma  will serve to measure the brightness increase due to dust as the system re-approaches perihelion in 2021. In addition comma  we request 1 orbit in 2021 June to probe for a potential orbit instability. It is currently unclear why no other systems with similar orbital properties as 288P are known. There is a strong detection bias against such systems comma  and the binary nature of 288P was only identified because of its activity. One the other hand comma  if activity is needed to form such systems comma  they may indeed be rare. Our proposed observations will shed light on the frequency of similar systems and on the processes behind binary asteroid formation and evolution. Since the re-activation is expected for the 2021 September-October time frame comma  we request 4 orbits in Cycle 28 and 4 orbits in Cycle 29.
DOI: 10.15156/bio/sh1284254.09fu
title: SH1284254.09FU

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-t5rqje2
title: 16928

description: The tension in the value of the Hubble constant as derived from the distance scale in the local universe and modeled from the anisotropies in the Cosmic Microwave Background continues to grow. While theoretical reasons for the tension are being explored comma  determining if systematics within rungs of the distance scale is the cause of the tension requires the use of independent techniques. Of late the tip of the red giant branch (TRGB) has provided a key test of the calibration of type supernova Ia by Cepheids and has not yet revealed a systematic effect at this stage. Another concern is both expanding the Supernova Ia calibration sample comma  itself comma  and expanding the sample beyond star-forming hosts due to variance in the supernova with host properties. The TRGB applied in the infrared is poised to be a powerful tool to probe ever larger volumes and reach a wider set of supernova Ia hosts. However comma  anchoring the IR-TRGB is challenging because the two primary systems comma  the Milky Way and the Large Magellanic Cloud comma  only have observations in the 2MASS filter system. Comparison of IR-TRGB calibrations from the ground suggests that there are strong differences between the WFC3-IR and 2MASS filter system that are hard to reconcile at distance-ladder required precision. Here pure parallel orbits in Large and Small Magellanic Cloud are proposed to produce a robust filter-calibration to secure the foundation for the IR-TRGB distance scale. The proposal uses a combination of IR imaging and spectroscopy to enable a broader set of calibrations for other facilities where the IR-TRGB can be applied.