cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.57780/esa-wbppvs2
title: 17112

description: Hot white dwarfs (WDs) represent the beginning of the end of the vast majority of stars. They are key objects to reconstruct the various evolutionary pathways of sun-like stars and serve as powerful tools to address a multitude of (astro-)physical questions. However comma  the physics operating in the hottest (Teff>50kK) WDs remains poorly to hardly understood comma  since several investigations on these short-lived stars rely on low-number statistics. Progress can only be made with further high-resolution FUV spectra uniquely allowing reliable Teff and metal abundances determinations. Gaia and extensive spectroscopic follow-up has now allowed us for the first time to assemble an all-sky sample of the brightest and hottest WDs comma  suitable for follow-up with the HST. The proposed Treasury program will triple the number of high-resolution FUV spectra of WDs in the enormous Teff interval 50-200kK and be precious to a broad scientific community. Key science cases aredoublePoint (1) Map metal abundance patterns along the early WD cooling sequence to decrypt several phenomena occurring during that stage (2) Provide powerful observational constraints to test theoretical diffusion comma  planet accretion comma  and wind models comma  as well as stellar evolutionary calculations (3) Assess systematic errors on Teff introduced by optical spectral analysis only comma  and by that calibrate our stellar atmosphere and binary light curve models that will be applied to thousands of hot WD from upcoming surveys (4) Identify (hitherto undetected) trans-iron elements to uncover opacity sources and to derive atomic data comma  which will allow to investigate heavy elements in hot stars in general
DOI: 10.15156/bio/sh1284294.09fu
title: SH1284294.09FU

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-wdtow2y
title: 16475

description: This program is the Cycle 27 implementation of the HST Optical Monitoring Program.  The 6 orbits comprising this proposal will utilize ACS (Wide Field channel) and WFC3 (UVIS channel) to observe stellar cluster members in parallel with multiple exposures over an orbit. Phase retrieval performed on the PSF in each image will be used to measure primarily focus comma  with the ability to explore apparent coma comma  astigmatism comma  and third order spherical changes in WFC3.   The goals of this program are todoublePoint 1. monitor the overall OTA focal length for the purposes of maintaining focus within science tolerances. 2. determine focus offset between the imagers and identify any SI-specific focus behavior and dependencies.  Starting with cycle 25 comma  POSTARGY = -41 is used to make the UVIS detector rotate about its center instead of about the center of the chip UVIS1 as ORIENT changes over the course of the year.  The resulting smaller area covered by UVIS has been matched to a dense part of the cluster to ensure a resonably large number of bright stars on UVIS in each visit.  The combination of the new target position (NGC-188-DENSE) and POSTARGY has moved the center of rotation by (+46 arcsec comma  -23 arcsec) in (RA comma  Dec).  The density of bright stars in the annulus sampled by the ACS-WFC parallel exposures has also been checked.  Where needed comma  the intervals between visits have been adjusted to ensure that each chip of each detector will cover an adequate number of stars.
DOI: 10.57780/esa-wempxke
title: 16305

description: We propose STIS coronagraphic imaging of an emblematic transition disk system comma  PDS 70 comma  known to be hosting a transition disk with a large cavity comma  a dust ring with an asymmetric brightness distribution and two forming giant proto-planets that are still in their gas accretion phase. PDS 70 is currently the only known system where giant planet formation can be witnessed and studied directly. With this program we propose to obtained the deepest images ever obtained of this system comma  with the same spatial resolution as ground-based 8-m telescope in the near-infrared. With these optical images showing light scattered by submicron particles that follow gas drag in the system comma  we will study 1- gas accretion by the forming protoplanets carving the cavity comma  and 2- the extended structure of the disk beyond 80au that has never been resolved from the ground.
DOI: 10.57780/esa-wg93a2o
title: 17163

description: We propose to obtain high spatial resolution imaging polarimetry of the surface of Europa to localize features in the polarization phase curve which are diagnostic of fresh deposition comma  sintering and aging comma  allowing identification of regions of recent cryovolcanism and subsurface activity. We will seek a relationship between polarization and global thermal inertia maps comma  and between polarization and spectroscopically distinct compositional units. Polarization and thermal inertia probe regolith porosity comma  surface transparency comma  composition and topography comma  while spectroscopically distinct regions relate to absorbing chemical admixtures. The overall global polarization pattern will constrain the systematic ice scattering characteristics. This polarimetric suite of high-resolution HST images comma  with its unique emphasis on surface physics comma  will complement the wide variety of upcoming observations from major flagship missions JWST comma  Europa Clipper comma  JUICE and Juno as well as thermal ALMA imaging. With Europa and its global saline ocean at the forefront of strategic planning for NASA and ESA as a target of exceptional astrobiological importance comma  it is essential to advance our understanding of the Europa surface to the maximum.
DOI: 10.15156/bio/sh1284295.09fu
title: SH1284295.09FU

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-wkeiali
title: 16447

description: Clone from Phase 1doublePoint This 8-orbit mid-cycle proposal requests HST-STIS coronagraphic imaging to confirm a candidate wide-separation protoplanet seen around AB Aur.  Near infrared data sets obtained over multiple epochs but only fully analyzed in May 2020 suggest a protoplanet whose colors-spectrum are distinguishable from scattered starlight and whose astrometry hints at orbital motion.    Optical imaging roughly contemporaneous with recently scheduled ground-based extreme AO follow-up observations in Fall 2020-Winter 2021 are required.  Only optical imaging can conclusively rule out the alternate hypothesisdoublePoint that this signal is a static disk feature. STIS is the only suitable optical high-contrast imaging instrumentdoublePoint its ability to yield unbiased detections of disks and point sources is unmatched by any ground or space-based facility.    The analysis will decisively point to one of 3 interpretationsdoublePoint 1) thermal emission from a protoplanet formed by disk instability comma  2) an orbiting disk region heated and puffed up by an unseen planet comma  or 3) a non-rotating disk feature whose pathological colors and near-IR variability can be mistaken for an orbiting protoplanet.  Our STIS imaging multi-roll reference star differential imaging will easily achieve the required contrast to distinguish these scenarios.    If interpretations 1) or 2) are supported comma  this candidate would be HST.s first bona fide exoplanet direct imaging discovery comma  given the recent controversy over Fomalhaut b.  Moreover comma  if 1) is correct comma  the program rewrites the field.s understanding of planet formation comma  decisively demonstrating the existence of multiple mechanisms for forming jovian planetsdoublePoint core accretion AND disk instability.
DOI: 10.15156/bio/sh1284296.09fu
title: SH1284296.09FU

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-wlqiseh
title: 16577

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 28.s program 16405.  Ramp pairs are taken twice a year comma  providing two separate calculations of gain each cycle.
DOI: 10.57780/esa-woqfdsi
title: 16395

description: This UVIS daily monitor program obtains full-frame comma  four-amp readout bias and dark frames.  All exposures are post-flashed at a 20 e--pixel level  a separate program (16397) will be used to obtain un-flashed UVIS darks to monitor non-postflashed behavior. The biases and darks from this proposal comma  in addition to those that are obtained as part of the WFC3-UVIS anneal program (16414) comma  will be used to create superbias and superdark calibration reference files for the Calibration Reference Data System (CRDS) and monitor the evolution of hot pixels comma  dark current comma  bias level and readnoise.  This is the second of three daily monitoring programs of Cycle 28 (the others are 16394 and 16396).  It covers March 15th comma  2021 through July 14th comma  2021. The combination of the three programs provides full coverage of Cycle 28.
DOI: 10.15156/bio/sh1284297.09fu
title: SH1284297.09FU

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-woqol2f
title: 16671

description: Some apparent supernovae (SNe) with strong circumstellar interaction are likely the explosion of very massive stars. Surprisingly comma  a significant fraction of these explosions is preceded by outbursts from weeks to years before. When and why outbursts herald terminal SN explosions is still V1.0. Moreover comma  in some cases comma  it is not even clear whether the star has undergone a terminal SN explosion or has rather experienced an extreme comma  but non-terminal comma  eruption as a d_commasupernova impostor... To answer these questions comma  we must first obtain clear evidence that these stars have indeed undergone a core-collapse supernova explosion. We propose to use HST+WFC3 to visit the field of four of these transients after they have faded to obtain a deep comma  high-resolution image. This will allow us to search for (or place limits on) any surviving stellar progenitor and hence test whether these are terminal explosions or not.
DOI: 10.15156/bio/sh1284298.09fu
title: SH1284298.09FU

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-wpw1op1
title: 16742

description: The observed growth in both the size and mass of galactic disks since redshift two requires an even larger increase in the specific angular momentum of the gas accreted from the circumgalactic medium comma  which is the only reservoir of gas that can sustain disk star formation for 10 billion years. The rotation of inflowing circumgalactic gas is therefore central to the development of the angular momentum of stellar disks. Observing gas accretion is complicated by the galactic outflows that feedback from massive stars drive out of the galactic plane. While the position angle and axis ratio describe the projected shape of the galactic disk comma  this leaves an ambiguity of which side of the galaxy minor axis tips toward the observer. This ambiguity produces degenerate solutions in modeling gas flows and identifying the origin of the observed gas comma  because observers do not know where the gas lies along line-of-sight. We propose new WFC3-UVIS imaging observation to map the spiral structures of 11 z=0.25 galaxies with circumgalactic Mg II absorption detected in the quasar sightlines. We will determine the 3D disk orientation using rotation curves and the wrapping direction of galaxy spiral arms. The imaging sample will be combined with 3 Mg II absorbing galaxies with spiral arms detected in archival images comma  bringing our sample to 14 galaxies. We collected high-resolution spectra of the quasars paired with the galaxies  these spectra resolved multiple Mg II components. The 3D orientation will constrain parameters of physical models (disks comma  radial inflow comma  and conical outflow) in individual sightlines. The measured gas flow properties will provide new constraints for models of disk growth.
DOI: 10.57780/esa-wrclqot
title: 16593

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/sh1284299.09fu
title: SH1284299.09FU

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-wsc6rie
title: 16247

description: A complete characterization of the spatial distributions of the different multiple stellar populations in Omega Centauri is of fundamental importance to study their formation and dynamical history. Recent studies have revealed a very complex picture of this cluster and found the presence of 15 different sub-populations groups. While previous studies have found a radial gradient in the number fraction of the two major groups of stellar populations comma  nothing is known about the radial variation of all the other groups of sub-populations. Studies of all the sub-populations are available in the core (from the literature) and in the outermost regions (from HST archival observations) of the cluster comma  while data in the intermediate regions are missing. These intermediate regions are those where the strongest radial gradient of the two major groups of stars has been found and they are thus essential to explore possible structural differences between all the different sub-groups.    Here we propose to collect the missing observations needed  to separate and identify all the sub-groups multiple populations in these intermediate regions. This will give us the opportunity to obtain the necessary radial coverage to trace for the first time the radial gradient of all the multiple populations along almost the entire cluster. Such a major improvement requires a relatively modest investment of only two additional HST orbits.
DOI: 10.15156/bio/sh1284300.09fu
title: SH1284300.09FU

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.