cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.57780/esa-6sp086v
title: 16487

description: We recently published evidence for a steep decline in chromospheric ultraviolet emission compared with coronal X-ray emission for mid-to-late M dwarfs. Very late M dwarfs appear to be underluminous in the ultraviolet by two orders of magnitude. If confirmed comma  this chromospheric decline will have profound implications for the habitability of exoplanet systems similar to TRAPPIST-1. The chromospheric decline may also point to a change in stellar dynamo mechanism at the fully convective boundary. We propose XMM-Newton and HST observations of three very late M dwarfs in order to test that the chromospheric decline is a common feature of the class.
DOI: 10.15156/bio/sh1283954.09fu
title: SH1283954.09FU

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-6uk8cpm
title: 16753

description: The white dwarf ZTF J1901+1458 is extreme in almost every regarddoublePoint it rotates every 6.94 minutes comma  one of the shortest periods measured for an isolated white dwarf comma  it is threaded by a magnetic field of almost a billion Gauss comma  and is the smallest white dwarf for which a radius has been measured comma  with a size comparable to that of the Moon. The white dwarf is so compact comma  that it might be gravitationally unstable and headed toward collapse. The radius.s measurement comma  however comma  hinges on assumptions on the white dwarf.s spectral distribution that can only be verified by ultraviolet spectroscopy. Moreover comma  a UV spectrum will allow a detailed modeling of the white dwarf.s magnetic field strength and morphology.
DOI: 10.57780/esa-6vqq6u0
title: 16505

description: The origin of the Fast Radio Bursts (FRBs) has become one of the central questions in contemporary astrophysics. Several lines of evidence have pointed to their association with some form of magnetar flare comma  occurring in external galaxies. However comma  this is by no means a unique explanation comma  with other viable models also suggested. A significant step forward in this field occurred with the apparent detection of a millisecond radio burst (essentially an FRB) from the Galactic magnetar SGR 1935+2154. This magnetar is one of the most active known and continues to undergo an unprecedented period of activity with an intensive ongoing campaign. Fortuitously comma  HST has previously observed the magnetar comma  locating an IR counterpart. Here we request a single orbit observation that will detect it in its current active state. This observation will enable us to test how the optical-IR emission appears after the FRB providing vital insight to other searches for optical-IR counterparts of FRBs in external galaxies. Furthermore comma  as the source is currently active and sufficiently bright for detection comma  a proper motion measurement with a 6-year baseline will be possible. The proper motion will enable the magnetar to be tracked back to its birth-site comma  testing its assocaition with a supernova remnant comma  as well as providing a route for comparing its velocity with that of the general pulsar population.
DOI: 10.15156/bio/sh1283955.09fu
title: SH1283955.09FU

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-6wzq1r5
title: 15491

description: We propose to study the last HST-accessible white dwarf (WD) cooling sequence (CS) for a nearby globular cluster (GC) comma  the chemically complex comma  extreme blue horizontal branch cluster NGC 6752.   Over 97% of stars end their lives as WDs comma  and the WD CS provides constraints not only on the age comma  but also potentially the star formation history of a GC. The CS of WDs also lies in the least-explored region of the color-magnitude diagram of old stellar populations. Recent deep imaging with HST has successfully reached the end of the WD CS in only three d_commaclassicald_comma old GCs comma  M4 comma  NGC 6397 and 47 Tuc comma  and reveals an unexpectedly complex comma  and double-peaked comma  WD CS in the metal rich old open cluster NGC 6791. One more investigation is in progress on the massive globular Omega Centauri comma  where over 14 sub-populations are known to exist.  While almost every cluster is known to host multiple populations comma  every single cluster is unique. NGC 6752 is a bridge between the relatively simple globular clusters comma  and Omega Cen comma  the most complex globular cluster known. NGC 6752 has an extended blue horizontal branch comma  a collapsed core and 3 chemically distinct populations. It is our last chance to add diversity to our very limited sample of WD CS comma  so far containing only 3 globular clusters comma  one old open cluster comma  and the complex Omega Cen system. We need to undertake this investigation while HST is still operational comma  as there is no foreseeable opportunity in the post-HST era to have one extra WD CS in the homogeneus optical photometric system of HST.
DOI: 10.15156/bio/sh1283956.09fu
title: SH1283956.09FU

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-6zsdlam
title: 17245

description: Millisecond pulsars (MSPs) are the fastest spinning compact stars known to date. They can appear as radio pulsars powered by the rotation of the NS magnetic field or accreting X-ray pulsars powered by the accretion of mass transferred by a companion star. The accreting millisecond X-ray pulsar SAX J1808.4-3658 has revealed an abrupt increase in intensity beginning in 19 August 2022 comma  indicating the onset of a new outburst. This activity has never been observed since the last outburst in 2019. During the outburst this source emits X-ray pulsations at the neutron star spin period comma  which have been already detected with NICER. Ultraviolet millisecond pulsations have also been detected from SAX J1808.4-3658 during its 2019 outburst with HST-STIS comma  representing the first discovery of this kind in accreting MSPs. For the first time in forty years of pulsar studies comma  we might have witnessed that electrons are accelerated to relativistic energies by the rotation of the neutron star magnetosphere even during the accretion phase. To probe the nature of this new phenomenon comma  we require disruptive activation time to observe SAX J1808.4-3658 with HST STIS-NUV-MAMA instrument combination to study UV pulses during the 2022 outburst. The detection of UV pulsations close to the peak of the outburst comma  when the mass accretion rate is maximum comma  would allow us to probe the UV pulse emission mechanism over a range of mass accretion rates spanning 2-3 orders of magnitude.
DOI: 10.57780/esa-717zze7
title: 16315

description: We request 5 orbits to observe the interstellar object 2I-2019 Q4 (Borisov) during the post-perihelion portion of its orbit comma  once it comes out of the HST solar avoidance region in mid-January 2021.  Photometry from HST and from the ground shows that the comet is still bright comma  consistent with continued CO-driven activity comma  and that it is likely still to be bright enough to observe when it emerges again from solar conjunction.  The requested data will be combined with high quality ground-based data comma  and HST imaging data obtained from several programs to perform detailed thermal modeling of the comet.s activity comma  search for structures in the coma comma  and to perform high precision astrometry on the outbound orbit to model the non-gravitational forces acting on the nucleus. This is a unique object comma  only the second of its class discovered. 2I is now past perihelion at a heliocentric distance of 2.7 au and is heading out of the solar system and will never return. There is intense scientific interest in this object because it is likely a remnant of the planet building process from an exoplanetary system that we have been given the opportunity to observe in close detail comma  thus it is important to finish the observations necessary to fully utilize the huge scientific investment already made on this object.
DOI: 10.15156/bio/sh1283957.09fu
title: SH1283957.09FU

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-72u7tc4
title: 16189

description: Type Ia supernovae (SNe Ia) are well known for their use as precise cosmological distance indicators due to a standardizable peak luminosity resulting from a thermonuclear explosion.  A growing subset of SNe Ia comma  however comma  show evidence for interaction with a dense circumstellar medium during the first year post-explosion comma  and sometimes longer (SNe Ia-CSM).  The origin of this dense CSM is V1.0 and suggests either (a) the less typical single-degenerate progenitor scenario must be considered comma  or (b) the exploding star was not a thermonuclear explosion of a white dwarf at all (i.e. comma  core collapse).  The ultraviolet (UV) offers a unique opportunity to determine the true nature of the SNe Ia-CSM subclass.  Unlike optical wavelengths comma  which can sometimes yield ambiguous classifications comma  the UV has distinguishing features due to its sensitivity to the composition of the optically thin ejecta that are illuminated by X-rays generated by shock interaction.  Yet not a single UV spectrum exists for this subclass.  Here we propose a non-disruptive ToO with HST-STIS to obtain 3 epochs (5 orbits each) of UV spectra of a SN Ia-CSM within 100 Mpc.  This program will not only distinguish between the SN explosion mechanisms comma  but also trace CSM interaction comma  constrain the progenitor mass loss history comma  and identify late-time heating mechanisms of warm dust.  Coinciding with Cycle 28.s UV Initiative comma  this program offers new insights regarding both the progenitor and explosion characteristics of the SN Ia-CSM subclass.
DOI: 10.15156/bio/sh1283958.09fu
title: SH1283958.09FU

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-734kllk
title: 16876

description: Studies of the most highly ionized galaxies in the universe offer insights into the complex interplay between feedback comma  shocks comma  and radiative cooling comma  driven by extreme star formation or accreting supermassive black holes. We here propose eight orbits of broad and narrowband imaging of J1356-2313 comma  a puzzling comma  newly discovered gravitationally lensed source at z=2.6 with the highly unusual combination of extreme high ionization UV line emission from O VI comma  N V comma  He II and C IV coupled with damped Lya absorption. Integral field spectroscopy of the kinematically narrow O VI emission reveals that it is gravitationally lensed into an arc comma  indicating a spatially extended source larger than an AGN narrow-line region  further comma  the line is kinematically inconsistent with a quasar outflow. The very high ionization emission lines may instead be a signature of catastrophic radiative cooling comma  which may suppress feedback in the most extreme starbursts.  With the proposed broadband imaging comma  we will construct a lensing model and determine the intrinsic luminosity of the source and the structure of the emitting region(s). Modeling of the spectral energy distribution will offer further constraints on the nature of the ionizing source. We also propose narrowband imaging of the extremely strong and spatially extended O VI emission comma  which is fortuitously redshifted into the F373N filter. The spatial resolution of HST in combination with the magnification of gravitational lensing will provide an unprecedented map of extremely high ionization line emission in the distant universe comma  allowing tests of the emission mechanisms discussed above.
DOI: 10.15156/bio/sh1283959.09fu
title: SH1283959.09FU

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-744yf17
title: 16375

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/sh1283960.09fu
title: SH1283960.09FU

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-794vpkq
title: 16889

description: HI-absorption-selected galaxies associated with damped Ly-alpha absorbers (DLAs) provide a unique opportunity to study the gas in .typical. galaxies at high redshifts comma  without a luminosity bias. We have used ALMA and NOEMA to detect CORCHETE_OPENCIICORCHETE_CLOSE-158 micron or CO emission from 13 DLA galaxies at z virgul 2-4 comma  and the JVLA to detect CO(2-1) or CO(1-0) emission from three of these galaxies. We propose to continue this successful ALMA+JVLA project comma  with (1) a JVLA search for CO(1-0) or CO(2-1) emission from five DLA galaxies at zvirgul2-4 with ALMA-NOEMA detections of CO or CORCHETE_OPENCIICORCHETE_CLOSE-158 micron emission comma  and (2) an HST ACS-WFC3 imaging of 3 of the 5 DLA galaxies comma  covering the rest-frame near-UV continuum. The JVLA observations will yield molecular gas masses for all five galaxies comma  and CO excitation information for four systems comma  while the HST observations will measure the dust-unobscured star formation rates  the combination of ALMA-NOEMA comma  JVLA and HST data will allow us to obtain the most complete picture of high-z DLA galaxies to date comma  and to directly test whether such galaxies might have been missed in emission-selected samples due to dust obscuration. We request 36.5 hours of JVLA time and 3 orbits of HST time.
DOI: 10.57780/esa-79ncxic
title: 16557

description: Test the repeatibility of the slit wheel by taking a sequence of comparison lamp spectra with grating G230MB (2697) and the three smallest long slits (52X0.2 comma  52X0.1 comma  and 52X0.05). This is a clone of Cycle 27 Program 15746.
DOI: 10.15156/bio/sh1283961.09fu
title: SH1283961.09FU

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.