cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.57780/esa-bc24maw
title: 17098

description: The leading determination of the Hubble constant comes from observations of Cepheid variables by HST calibrated by parallaxes from Gaia. This measurement is in tension with the value predicted by LambdaCDM calibrated by the CMB. The suggested limitation of the current cosmological model is a clue we must be pursue.  The sample of Milky Way Cepheids observed by HST offers the means to build a still superior distance ladder and reach the long-targeted legacy goal of a 1% measurement of H0. Unfortunately comma  an unexpected Gaia anomaly has reduced the available precision of a Cepheid calibration sample planned well before Gaia.s launch.  We thus propose an HST SNAP program to double the current sample by imaging all remaining Milky Way Cepheids in Gaia.s ''sweet spot.. for the greatest gain comma  using the same WFC3 bands for their extragalactic counterparts to nullify the effects of calibration errors along the distance ladder. The MW variables were selected to have the highest signal-to-noise in the measured parallaxes comma  the lowest reddening comma  to be fainter than Gaia.s saturation limit comma  and with periods that directly calibrate extragalactic Cepheids and H0. The proposed sample has also been cleansed of astrometric binaries which degrade parallax precision comma  newly revealed by Gaia.s EDR3 (December 2020).  Together comma  Gaia and HST comma  each doing what they do best comma  can achieve what neither can do alone. Collecting these observations will lay a cornerstone for a 1% determination of H0 and continue to steadily advance our knowledge of what appears to be a new feature in the cosmological model.
DOI: 10.15156/bio/sh1284021.09fu
title: SH1284021.09FU

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-bd29yik
title: 16766

description: Super-luminous supernovae (SLSNe) are rare stellar explosions whose explosion mechanism and source of immense luminosity are not well established. SN2020abjc is the longest-lasting SLSN known. Its properties are extreme comma  even for slow-evolving SLSNe. Its spectrum shows no sign of interaction of the SN ejecta with a circumstellar medium and its light curve (shape and colour) rejects a central engine such as a magnetar. We are thus left with the conclusion that a long-lasting light curve equals a long diffusion time comma  which again requires a very high total mass. The pair-instability-supernova (PISN) mechanism naturally provides both the energy source (a lot of Ni) and the long diffusion time (large mass). Could SN2020abjc be a PISNquestionMark We propose to obtain slitless near-IR spectroscopy with WFC3-IR and the G102 and G141 grisms to measure the amount of iron comma  sulphur comma  silicon and helium in the ashes of the SN progenitor. This will enable us to unveil the explosion mechanism and the progenitor of this unusual SLSN.
DOI: 10.15156/bio/sh1284022.09fu
title: SH1284022.09FU

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-bdcr3kq
title: 16439

description: We aim to measure the time dependent sensitivity loss for WFC3-IR using spatial scans of the open cluster M35.  We use spatial scanning as the SNR achieved from scanning is higher than conventional staring observations. The spatial scans build on the F140W observations performed in HST program 14020 and the F140W and F098M observations performed in HST program 16031. The observations are performed over two identical visits virgul3 months apart and the observation structure in each visit is also identical with that executed in program 16031. The proposed data will extend the existing baseine by virgul1 year and the short interval between the visits will provide additional sampling for the short-term repeatability analysis.
DOI: 10.15156/bio/sh1284023.09fu
title: SH1284023.09FU

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-bf9qi6w
title: 17022

description: Throughout the lifetime of WFC3 comma  a growing number of blobs (small comma  circular regions with slightly decreased sensitivity) have appeared in WFC3-IR images. Dark-Earth flats (observations of the dark side of the Earth) can be used to monitor the number and positions of blobs that appear in IR images due to dust on the channel select mechanism (CSM). These flats provide a high enough background level due to the dark-Earth airglow (virgul1000 DN - virgul3500 DN per pixel in each virgul25 second SPARS25 sample for F153M) which make the blobs easier to detect. By limiting the exposure time to 102.9 seconds comma  we avoid saturating the detector and yet will obtain several 25-sec samples to select from comma  in case some are contaminated by city lights. In addition to monitoring the number and positions of these blobs on the IR detector comma  this program will allow us to monitor the repeatability of WFC3.s channel select mechanism movements to ensure it does not exhibit anomalous behavior. More information can be found in WFC3 ISR 2018-06. In addition comma  observations are critical for evaluating and updating the WFC3-IR blob convolutional neural network comma  which identifies new blobs (see WFC3 ISR 2021-08).
DOI: 10.57780/esa-bhm1tuc
title: 17231

description: What is the cosmic star formation historyquestionMark How do galaxies assemble and grow their stellar massquestionMark Answering those questions requires multiwavelength high resolution data comma  covering from the ultraviolet tracers of current star formation to the optical-infrared tracers of older stellar populations. This kind of data is limited to zvirgul3 in existing HST surveys. We propose to obtain the first deep high resolution panchromatic view of galaxies at z>4 by taking deep ACS-F606W-F775W images of the very first deep public extragalactic field to be imaged by NIRcam as part of the ERS-1324 program (reaching 29AB in 7 bands from F090W to F444W). The combined dataset will be public immediately and provide the community with a sample of >100 galaxies at z<4<6 with full rest frame UV-to optical coverage. This sample will provide first answers to the following specific questionsdoublePoint 1) Does the spatial distribution of starforming regions and underlying quiescent stellar populations evolve in the same wayquestionMark 2) Is star formation mostly in situ or merger drivenquestionMark 3) Is our current measurement of the global star formation history reliablequestionMark 4) How clumpy is star formation and dust extinction at high redshiftquestionMark We will make the reduced data public immediately to provide rapid understanding in the community of galaxy evolution in this epoch in time for JWST Cycle-2 proposals. We anticipate that the images will be used by the community for many more applications comma  beyond those listed above.
DOI: 10.15156/bio/sh1284024.09fu
title: SH1284024.09FU

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-bjeuyi5
title: 17255

description: The goal of his program is to demonstrate a new way to pin the pixel-based CTE model.  We will take a set of 500s dark exposures with a variety of post-flash levels comma  from 0e to 40 comma 000e.  Each expousure by design should have the same WPs (warm pixels) before readout comma  but the various backgrounds will result in different CTE losses for each WP in each recorded exposure.    By studying the survival of the electrons in each WP comma  we can compare the pixel-based model.s predictions for losses-vs-WP intensity-vs-sky background against the results seen in the actual detector.  Previous programs have taken sets of short darks and long darks comma  but there were not always enough WPs in the short darks to make those exposures useful.  This was particularly the case at higher background levels where fainter WPs cannot be reliably measured on account of the noise in the background itself.  The longer darks employed for all exposure levels here should alleviate these concerns.  The current plan is to take a program like this in our routine yearly suite of calibrations.
DOI: 10.57780/esa-bjhr2b2
title: 17019

description: This calibration program takes a series of ultraviolet and visible wavelength internal flat images throughout the year comma  which allows us to track the randomly distributed population of pixels that exhibit anomalous Quantum Efficiency variations between anneals. The anomalous pixels are distinguished by a sensitivity loss that is more pronounced in blue wavelengths than in red wavelengths. The population of pixels is unique for each anneal cycle and has clustering in the UV range.
DOI: 10.15156/bio/sh1284025.09fu
title: SH1284025.09FU

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-bkrir3k
title: 16356

description: The performance of MAMA microchannel plates can be monitored using a MAMA fold distribution procedure. The fold distribution provides a measurement of the distribution of charge cloud sizes incident upon the anode giving some measure of change in the pulse-height distribution of the MCP and comma  therefore comma  MCP gain. This proposal executes the same steps as the STIS MAMA Fold Distribution comma  Proposal 15754 comma  as Cycle 27.
DOI: 10.15156/bio/sh1284026.09fu
title: SH1284026.09FU

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-bljlu01
title: 16317

description: The advent of GALEX and COS have revolutionized our view of HeII reionization comma  the final major phase transition of the intergalactic medium. Efficient COS surveys have provided a statistical sample of strongly fluctuating HeII Lyman alpha absorption at 2.7<z<3 comma  evoking a picture of overlapping HeIII zones around quasars at the end of HeII reionization. Unexpectedly comma  the seven rare quasars probing z>3.5 have revealed a set of HeII transmission .spikes. and larger regions with nonzero transmission that suggest HeII reionization was well underway by z=4. This is in striking conflict with radiative transfer simulations of a HeII reionization driven by bright quasars. Explaining these measurements may require either faint quasars or more exotic sources of hard photons at z>4 comma  with concomitant implications for HI reionization. A recent survey for high-redshift quasars in the southern hemisphere has uncovered the highest-redshift far-UV-bright quasar known (z=3.95 comma  FUV=21.7). We propose here for COS G140L follow-up spectroscopy to (i) confirm its utility for HeII absorption studies by identifying possible interloping low-z HI absorbers comma  (ii) provide accurate measurements of the HeII Lyman alpha effective optical depth that are limited by systematics for much fainter already observed quasars comma  and (iii) constrain the lifetime of the background quasar from its ionized proximity zone. Moreover comma  the proposed observations would provide only the third z>3.5 sightline that would allow for high-resolution G130M spectroscopy before the end of HST.s mission.
DOI: 10.57780/esa-boqk4mw
title: 16476

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/sh1284027.09fu
title: SH1284027.09FU

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-bplacol
title: 17259

description: The goal of his program is to demonstrate a new way to pin the pixel-based CTE model.    We will take a set of virgul500s dark exposures with a variety of post-flash levels comma  from 0e to 30 comma 000e (the maximum possible).  Each expousure by design should have the same WPs (warm pixels) before readout comma  but the various backgrounds will result in different CTE losses for each WP in each exposure.  By studying the survival of the electrons in each WP comma  we can compare the pixel-based model.s predictions for losses-vs-WP intensity-vs-background against the results seen in the actual detector.  Previous programs have taken sets of short darks and long darks comma  but there were not always enough WPs in the short darks to make those exposures useful.  This was particularly the case at higher background levels where fainter WPs cannot be reliably measured on account of the noise in the background itself.  The longer darks employed for all exposure levels here should alleviate these concerns.  The current plan is to take a program like this in our routine yearly cal suite.
DOI: 10.15156/bio/sh1284028.09fu
title: SH1284028.09FU

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-bs8vmi6
title: 15904

description: We propose to use long-slit STIS-G140M spectroscopy to spatially resolve red giant winds for the first time.  Specifically comma  we will study the H I Lyman-alpha wind scattering around two red giant stars comma  Alpha Tau (K5 III) and Gamma Cru (M3.5 III).  This project is stimulated by the very recent realization that in existing STIS-E140M spectra of these giants and others comma  the Lyman-alpha emission is to a large extent uniformly filling the 0.2x0.2 arcsecond STIS aperture comma  especially for the M giants.  The only obvious way to explain this surprising result is to propose that H is actually ionized close to the stars comma  only becoming neutral far from the star (>10 R_star).  Such a picture could dramatically alter our understanding of red giant winds comma  potentially increasing mass loss rate estimates for such stars by over an order of magnitude.  Our proposed new observations will determine exactly how far the Lyman-alpha scattering region truly extends around K and M giants.  In combination with constraints on the winds from existing STIS echelle spectra comma  we will be able to make more accurate mass loss rate measurements comma  involving better constrained assessments of wind temperature and ionization structure.  Finally comma  as these winds are known to be variable comma  we could potentially be able to detect and study spatial structure in red giant winds for the first time.