cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.57780/esa-48n1yj5
title: 16458

description: Long-duration gamma-ray bursts are associated with the collapse of massive stars comma  occurring ubiquitously in star-forming environments. These insights are based on studies of the more than 1000 bursts localised over the past 20 years. However comma  last year one burst comma  GRB 191019A comma  was discovered which appeared to challenge this rule. GRB 191019A is a regular long GRB coincident with the nucleus of an apparently passive galaxy at z=0.248. The probability of chance alignment within 0.1d_comma of the galaxy nucleus is minimal (virgul10elev-6) comma  and so the association appears secure.  There is no sign of any underlying supernova (SN) to limits >10 times fainter than typically in GRB supernovae. There is also no indication of nuclear SMBH activity in the galaxy (no X-ray detection to deep limits comma  or emission lines in the optical spectrum) comma  and the source vanishes within a few hours comma  too quick for the expected evolution of tidal disruption events. This event may therefore represent a genuinely new route to the creation of a long GRB. Here we request deep UV observations to search for any underlying star formation to limits of <0.01 Msol-yr. The detection of even weak star formation would favour the origin in a massive star comma  in keeping with other GRBs. In this case comma  it is likely to provide evidence for the direct collapse of a massive star to a black hole. Alternatively comma  the absence of star formation may suggest a dynamical channel in the dense nuclear regions of the host galaxy. These HST observations are hence crucial in determining the origin of this new comma  and possibly so-far unidentified signal of stellar death.
DOI: 10.15156/bio/sh1283914.09fu
title: SH1283914.09FU

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-49vu26i
title: 16982

description: This monitor is used in order to track possible changes in the postflash light distribution or in the brightness of the LED. Further comma  these results are used to provide updated postflash reference files for use in the CALWF3 pipeline. These reference files are generated from the data within this monitor.
DOI: 10.15156/bio/sh1283915.09fu
title: SH1283915.09FU

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-4avplxs
title: 16809

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-4b9x5c7
title: 16240

description: Treating metals as homogeneous distributions throughout star-forming galaxies (SFGs) is no longer acceptable. Chemical inhomogeneities have been detected in the ionized gas of numerous SFGs via spatially resolved studies comma  with large implications for the flow of metals within and around galaxies. However comma  metals exist in multiple phases and comma  at present comma  the spatial distribution of metals throughout the neutral gas in SFGs remains V1.0. Recent high-resolution galaxy-scale hydrodynamical simulations have made significant advancements comma  opening up crucial questions concerning mixing timescales and the presence of localized enrichment between the two gas phases. Answers can only be found by measuring both the neutral and ionized gas abundances along multiple identical sightlines throughout a nearby SFG. Here we propose COS G130M spectroscopy of 6 sightlines in NGC5253 (4 new comma  2 archival) comma  to measure the neutral gas abundances towards clusters ranging between 1-15Myr. When combined with ionized gas abundances of spatially matched spectra from VLT-MUSE comma  this unique dataset will provide the first spatially resolved study of metals both within and between two phases within a galaxy. Determining whether metal abundance offsets exist between the two phases comma  both globally and locally across a range of HII region properties comma  enables an exceptionally detailed sampling of chemical mixing scenarios and enrichment mechanisms experienced in SFGs. NGC5253.s low-metallicity and high SFR make our findings applicable to both nearby and high-z SFGs. This remarkable study will provide the first observational test of multi-phase abundance patterns in cosmological simulations of dwarf galaxies.
DOI: 10.15156/bio/sh1283916.09fu
title: SH1283916.09FU

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-4brq23g
title: 16278

description: A total of four bright microlensing events (<26.5 mag AB) of individual luminous stars at redshift z=1-2 have recently been discovered in Hubble Space Telescope observations of galaxy-cluster gravitational lenses. The frequency of these events appears to be greater than expected comma  and a sufficiently elevated rate would directly imply the existence of compact objects consisting of even 1-2% of dark matter. Galaxy-cluster fields also highly magnify the galaxies responsible for the reionization of the universe comma  yet lens models require improvement to predict the magnifications of high-redshift galaxies accurately. Finally comma  we lack constraints on the stellar luminosity function at z=1-2.  We propose two epochs of unfiltered ACS WFC and WFC3 UVIS imaging of each of the six Hubble Frontier Field (HFF) galaxy clusters fields with a single-visit five-sigma limiting magnitude of 31 AB. The observations will detect of order 100 microlensing events at three-sigma and two dozen at five-sigma significance comma  as well as an equal number of always-visible pairs of stellar images. If only 2% of dark matter consists of primordial black holes comma  then we will detect five times as many microlensing events.   The pairs of stellar images will stringently constrain lens models comma  probe the abundance of low-mass dark-matter halos comma  and evaluate the possibility that dark matter consists of ultra-light bosons.  The relative rates of microlensing events across lensed galaxies will measure variations in their stellar luminosity functions.    The proposed imaging program will comma  finally comma  identify low-redshift contaminants in James Webb Space Telescope Lyman-break galaxy samples comma  and detect ultra-faint galaxies.
DOI: 10.15156/bio/sh1283917.09fu
title: SH1283917.09FU

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-4cwzhu6
title: 16659

description: In the last 20 years comma  the study of compact interacting binaries has led to two major breakthroughs in astrophysicsdoublePoint the discovery of dark energy and the first detection of gravitational waves. Although binaries are critically important to probe the properties of the Universe and to test fundamental physical theories comma  our understanding of their evolution and final fate is still far from being complete. Accreting white dwarfs are ideal laboratories in which to test the models of compact binary evolution. We here propose a COS Treasury program specifically designed to explore those regions of the parameter space that have been previously poorly studied and where major discrepancies between the theory and observations are found. Combining the high-quality ultraviolet data with the parallaxes from Gaia comma  we will accurately measure effective temperatures comma  masses and accretion rates for 43 accreting white dwarfs (the minimum number required to homogeneously sample the entire physical parameter space spanned by this diverse population) thereby testing the mechanisms of angular momentum loss which drive the evolution of all kinds of binaries. The white dwarf masses are a key ingredient in the pathway toward Supernova Type Ia explosions and by obtaining their accurate values comma  we will constrain both the single and the double-detonation scenarios. Finally comma  only the ultraviolet allows the detection of the nitrogen and carbon resonance lines. From their abundances comma  we will establish the formation channel for the most compact systems comma  which will later be used to verify the performance of the space-mission LISA and calibrate the detector for future gravitational wave source discoveries.
DOI: 10.15156/bio/sh1283918.09fu
title: SH1283918.09FU

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-4fwy9lk
title: 16206

description: We propose to measure the mass of the isolated M subdwarf 2MASS J13055171-7218081 (hereafter J1305) comma  using both photometric and astrometric microlensing techniques. Searches of the recent Gaia DR2 have led to predictions of over 100 close passages of nearby stars in front of background sources that will occur in the next 20 years. Among these comma  J1305 is the closest of all comma  predicted to have a remarkably small impact parameter of virgul5.8 mas comma  occuring in 2019 November.  As J1305 passes in front comma  it will cause a relativistic deflection of the background star by virgul0.9 milliarcsec comma  and a photometric brightening by virgul5.5%. The deflections and the amplifications comma  measured with HST.s WFC3 comma  will provide the first opportunity to derive a lens mass through BOTH photometric and astrometric microlensing methods. The estimated accuracy of our mass measurement is virgul4%.  J1305 is of special interest as an extreme halo M subdwarf comma  having a transverse velocity of 236 km-s comma  and lying 3 magnitudes below the Population I main sequence. Spectroscopic observations show it to be an M3 dwarf with a very low metallicity of CORCHETE_OPENFe-HCORCHETE_CLOSE = -1.8. Its estimated mass is virgul0.11 Msun comma  but this is exquisitely sensitive to luminosity comma  effective temperature comma  and metallicity.  To date comma  there are only a small number of mass measurements comma  based on binary stars comma  for metal-deficient M dwarfs comma  and none at all for masses less than 0.17 Msun or for CORCHETE_OPENFe-HCORCHETE_CLOSE < -0.9. Our program will provide the first direct comma  model-independent mass determination for an extremely metal-deficient M dwarf comma  and a critical test of theoretical models for metal poor comma  low-mass stars.
DOI: 10.57780/esa-4ilbvhw
title: 16583

description: This program will observe GD-153 comma  GD-71 and GRW+70 to verify the flux calibration near the center of the field (-20 comma  0) and a few other positions using the WFC3 IR G102 and G141 grisms.  These calibrations will be compared with those derived from previous programsdoublePoint 16408 (GD-153 comma  GD-71 comma  GRW+70) comma  15728 (GD-153) comma  15587 (GD-153) comma  14994 (GD-153) comma  14544 (GD-153) comma  14386 (GD-153) comma  14024 (GD-71) comma  13579 (GD-153) comma  13092 (GD-153) comma  12702 (GD-71) comma  12357 (GD-71) comma  11937 (GD-71) to check for any time evolution. The data will also be used to calculate wavelength solutions for the grisms and to check for time dependent sensitivity evolution of the G102 and G141 observing modes.
DOI: 10.15156/bio/sh1283919.09fu
title: SH1283919.09FU

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-4j7lo5w
title: 16653

description: Proxima Centauri is the closest star to the Sun and the closest known exo-planetary system to Earth. It is therefore a key benchmark for detailed investigations of multi-planet system architecture comma  particularly for low mass stars. Recent ground-based radial velocity campaigns indicate the presence of at least one --and possibly a second-- exo-planet orbiting Proxima Centauri.   To test the multi-planet configuration of this system comma  we propose to use HST in spatial-scanning mode to obtain the most precise relative astrometry for Proxima Centauri to date (virgul20 micro-arc-seconds). The proposed sequence of six (6) epochs of observations over three (3) years will unambiguously detect the astrometric perturbation of Proxima Centauri induced by the hypothesized planet c comma  and constrain that planet.s orbital geometry and mass.
DOI: 10.15156/bio/sh1283920.09fu
title: SH1283920.09FU

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-4ki4kal
title: 16290

description: Observational studies of planet-hosting T Tauri stars (TTS) provide crucial insight into the earliest evolutionary stages of planet formation at ages of a few Myr. In a exciting new discovery comma  two giant protoplanets have been directly imaged orbiting in the disk gap of the nearby (113 pc) TTS PDS 70. The gap is gas-depleted comma  directly exposing the protoplanets to UV and X-ray irradiation from the star. PDS 70 is the closest planet-hosting TTS discovered so far and viewed through very low extinction comma  making it an exceptional target for UV spectroscopy with HST.  We propose to obtain the first UV spectra of PDS 70 using STIS FUV (G140L) and NUV (G230L) gratings. Our main objectives are to determine the star.s accretion rate (which remains controversial) and use the UV spectra comma  along with existing X-ray spectra comma  to assess the impact of UV-X-ray irradiation on disk and protoplanet atmosphere ionization and heating. Stellar UV and X-ray emission influence disk dissipation and mass-loss comma  thus affecting the timescale for planet-formation comma  a key constraint for planet-formation models.
DOI: 10.57780/esa-4kxynzg
title: 16839

description: Since the discovery of globular cluster LMXBs in the 1970s comma  it was long assumed there was only one luminous LMXB per cluster. Deep Chandra observations of globular clusters have revealed that they contain numerous quiescent LMXB systems comma  any of which could go into outburst. Past Chandra studies have shown that globular clusters can indeed harbor multiple transients and that more quiescent LMXBs are hiding under the sensitivity limits of even relatively deep Chandra exposures. Here we propose a Chandra program to precisely localize new transients in globular clusters comma  with the aim of gaining better insight into globular cluster LMXB populations. As part of this effort we further request HST observations to identify the optical counterparts of these transients.
DOI: 10.15156/bio/sh1283921.09fu
title: SH1283921.09FU

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.