cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.57780/esa-xnbbxqp
title: 16498

description: ASASSN-14ko is a recently discovered comma  periodically flaring comma  nuclear transient within known AGN ESO 253-G003. The flares have a mean period of virgul114 days and a nonzero comma  negative period derivative. The exact origin of these UV-optical flares is currently V1.0. STIS UV observations of the rise comma  peak comma  and decline in the UV revealed rapid and dramatic evolution in Dec 2020 showing strong P Cygni profiles in the FUV for C IV and N V that rapidly changed. The UV spectra during all of the epochs substantially differ from any tidal disruption event (TDE) with UV spectroscopic observations and also differ from any AGN-quasar spectrum the proposers are familiar with.  The rapid evolution itself is also unprecedented for TDEs which thus far have exhibited static or slowly evolving UV spectra. Most intriguing is that the appearance of the P Cygni profiles appears to correlate with X-ray diminings which are consistent with being due to obscuration.  Combining the X-ray and STIS observations for the Dec flare a consistent picture of a rapid outflow comma  possibly a tidal stream comma  is emerging. Here we propose for 2 additional early-time STIS spectra covering the earliest phases of ASASSN-14ko.s April 2021 outburst.  These observations will bring into focus these dramatic spectroscopic and X-rays changes.
DOI: 10.15156/bio/sh1284307.09fu
title: SH1284307.09FU

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-xo8mpug
title: 16525

description: This program will obtain a direct calibration of photometric losses due to imperfect CTE by imaging stars in 47 Tuc
DOI: 10.57780/esa-xq1hi3q
title: 16373

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/sh1284308.09fu
title: SH1284308.09FU

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-xq2o6ft
title: 16283

description: Multiple populations are recognized to be a common trait of nearly all ancient Globular Clusters (GCs) comma  but no model or scenario so far proposed for their formation satisfies all the observational constraints comma  and observations are still necessary to discriminate among competing models. HST observations have largely contributed to define the properties of multiple populations  in particular comma  HST observations have clearly revealed the photometric manifestation of the presence chemically distinct groups of stars. A recent spectroscopic investigation of NGC6402 has shown that this massive GC hosts three populations comma  including a primordial comma  a quasi-primordial and an extreme group comma  this latter displaying light elements abundances that in other GCs comma  (e.g.NGC2808) comma  are associated with a very high helium. This peculiar distribution of abundances has stimulated innovative formation scenarios where the cluster requires two distinct sources and timescales of enrichment. We propose to derive the 'chromosome map. two-color diagram that harnesses the unique UV capabilities of the UVIS channel of WFC3 and investigate the possible abundance gap in these spectro--photometric data comma  by separating the different groups. We will then determine the relative helium abundances of the groups comma  and discern between two competing scenarios for the formation of the extreme population in this clusterdoublePoint either a scenario in which these stars formed from pristine gas mixed with ejecta of a supermassive star formed and living in the first virgul5-15 Myr in the cluster core  or the Asympotic Giant Branch (AGB) scenario comma  in which the extreme stars are formed from the pure ejecta of super-- AGB stars.
DOI: 10.15156/bio/sh1284309.09fu
title: SH1284309.09FU

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-xujdp8i
title: 16249

description: A quantitative description of dark energy is assembled from observations of supernovae Ia at different redshifts. The fluxes of supernovae are compared with nearby supernovae in the rest frame comma  thus accurate relative flux with wavelength calibration is critical to understand the nature of dark energy. The dominant systematic error in measuring relative fluxes is currently from uncertainties in the flux of stellar standards. Our proposal will directly address this critical barrier.  We propose STIS and WFC3 low resolution observations that will lead to a network of 16 cool (Teff < 20 comma 000 K) white dwarfs. This will provide a new set of primary flux standards that is expected to have higher accuracy at near-IR and IR wavelengths compared to the currently most precise set of fluxes which comes from HST spectrophotometry of three hot white dwarfs (Teff > 30 comma 000 K). Our program will provide the legacy for flux calibration of near-IR and IR instruments onboard future missions such as JWST comma  Euclid and WFIRST. We also expect that our network will lead to an accuracy of <0.5% on the wavelength-dependent flux calibration in the optical (ground or space) comma  increasing by a factor of two the precision on the luminosity of the tens of thousands of supernovae Ia to be detected from LSST.
DOI: 10.57780/esa-xwvri01
title: 16884

description: We ask for 4 WFC3 orbits to observe the subluminous 1991bg-like Type Ia supernova (SN Ia) SN 2021qvv when it is 150-250 days past maximum light. With observations in F125W (J) comma  F160W (H) comma  and F350LP (optical) in each of four visits comma  we will determine whether this SN Ia subtype undergoes a similar near-infrared (NIR) plateau as the one recently discovered in so-called d_commanormald_comma SNe Ia. The latter have long been used as standard candles in cosmology comma  yet the nature of their progenitors and explosion mechanism remains elusive. The abundance of SN Ia subtypes comma  including 1991bg-like SNe Ia comma  only complicates matters. It is still unclear whether several (or all) SN Ia subtypes share the same progenitor and explosion method as normal SNe Ia comma  or whether each subtype originates in a different type of star and explosion physics. The first option ties into the nagging question of how standard SNe Ia really are as standard candles. Revealing the progenitors of normal SNe Ia and the other SN Ia subtypes would go some way to answering this question. The recently discovered NIR plateau at 150-500 days offers a new way to constrain the progenitors and explosion physics. In normal SNe Ia comma  this plateau could be a third NIR maximum comma  similar to the second NIR maximum seen shortly after the first peak. These additional peaks could be due to the recombination of iron in the expanding ejecta. These secondary NIR peaks are not seen in 1991bg-like SNe Ia comma  a fact used to constrain the mass comma  temperature comma  and chemical composition of the progenitor. The presence or absence of the late-time NIR plateau in 1991bg-like SNe would place further constraints on the progenitor and the recombination wave model.
DOI: 10.15156/bio/sh1284310.09fu
title: SH1284310.09FU

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-xxefp8f
title: 16210

description: Dual quasars are expected to be common in the hierarchical structure formation paradigm. Despite their significance comma  no confirmed dual quasar is known with <10 kpc separations at 1<z<3 comma  in stark contrast to theoretical expectations. We propose STIS (G750L) slit spectroscopy for 14 double-core quasars to systematically discover close dual or lensed SMBHs at redshifts 1<z<3 for the first time. Our sample probes a new regime at higher redshifts and smaller merger separations than previous work - crucial for understanding the significance of mergers in triggering quasar activity in the cosmic d_commahigh noond_comma. Our targets are selected using the new astrometric techniquedoublePoint when two close-by AGN vary stochastically comma  their combined light centroid shifts comma  which is detectable by Gaia. Follow-up HST imaging of Gaia-selected targets has uncovered double-cored morphology with nuclear separations of virgul0.3d_comma-0.6d_comma. The proposed STIS spectra will reject interlopers such as chance superpositions with stars-galaxies to unambiguously confirm the targets as dual or lensed quasars. The results will provide empirical constraints on the merger rate of supermassive black holes and therefore on the stochastic gravitational wave background from binary supermassive black holes.
DOI: 10.15156/bio/sh1284311.09fu
title: SH1284311.09FU

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: 10.15156/bio/sh1284312.09fu
title: SH1284312.09FU

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-y0i2fc0
title: 16355

description: This program aims at obtaining FUV-MAMA  flat-field observations to create a  new p-flats with  a SNR of virgul100 per  (low resolution) pixel. The flats  are obtained with  the Krypton-lamp and  the MR grating G140M comma  similarly to the cycle 17 comma  18 comma  20 comma  22 comma  24 and 26 programs.
DOI: 10.57780/esa-y0pzquk
title: 16569

description: The goal for this program is to monitor the degradation of the Charge Transfer Efficiency (CTE) and the efficacy of using post-flash mode over time. These are monitored using a series of WFC3-UVIS darks with NO post-flash taken before and after the monthly UVIS anneal. There is another program that collects post-flashed darks to monitor the hot-warm pixel growth and median dark current of the detector comma  and so this is a supplementary program to that one comma  to compare un-flashed internals to these post-flashed ones. When used in conjunction with the post-flashed internals comma  the un-flashed internals allow for an assessment of how well the post-flash is mitigating the CTE losses.  The products generated from this program include on-going analysis of the post-flash efficacy and an updated report on the CTE degradation over time. This is usually in the form of an ISR.  Prior result is WFC3 ISR 2019-10doublePoint Post-flashed superdarks contain at least 50% more hot pixels comma  and had 2 e--hr lower dark current for each anneal cycle
DOI: 10.15156/bio/sh1284313.09fu
title: SH1284313.09FU

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-y6zilsb
title: 16857

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/sh1284314.09fu
title: SH1284314.09FU

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-y78gge8
title: 16214

description: C-2017 K2 is intrinsically the brightest Oort cloud comet found in recent history comma  and presents a unique opportunity to efficiently characterize the constituent properties of a still primitive comet on its way in toward the inner solar system for the very first time. Its exceptional brightness in the outer solar system suggests it to be much larger than typical Oort cloud comets---normally too faint to observe at these distances---and makes it a particularly compelling target for early polarimetric characterization comma  which requires a high signal-to-noise ratio to usefully constrain its dust properties. Imaging polarimetry of nearby comets has previously revealed varied polarized structures comma  such as halos and jets comma  that reflect spatial variation in grain size and structure. Jets are of particular interest as they entrain and expose fresh grains from beneath the surface comma  previously shielded from the space environment since the formation of the solar system comma  and are too small-narrow to be resolved in the outer solar system by ground-based imaging polarimetry. We propose to use high resolution HST-ACS polarimetry and color imaging of C-2017 K2 at a pre-perihelion epoch 6.5--7 au from the Sun comma  well before the onset of water ice sublimation comma  to constrain the properties of refractory grains in the jets and surrounding coma comma  and their physical evolution as they move outward from the nucleus. These observations comma  in concert with analogous results from more evolved comets in the inner solar system comma  will probe the formation environments and evolutionary histories of these assorted comets comma  and their implications on the formation and evolution of the solar system as a whole.