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74 results for “white dwarfs”
A strange dwarf scenario for the formation of the peculiar double white dwarf binary SDSS J125733.63+542850.5
<p>MESA inlists associated with <a href="https://ui.adsabs.harvard.edu/#abs/2018MNRAS.476..109J/abstract">Jiang et al. (2018)</a>. MESA version 8845.</p> <p>Publication DOI: <a href="https://doi.org/10.1093/mnras/sty238">10.1093/mnras/sty238</a></p>
Residual Carbon in Oxygen–Neon White Dwarfs and Its Implications for Accretion-induced Collapse
<p>MESA inlists associated with <a href="http://adsabs.harvard.edu/abs/2019ApJ...872..131S">Schwab & Rocha (2019)</a>. MESA version r9793 and r10108.</p>
Convection Destroys the Core/Mantle Structure in Hybrid C/O/Ne White Dwarfs
<p>MESA inlists and run_star_extras associated with <a href="https://ui.adsabs.harvard.edu/?#abs/2017ApJ...834L...9B">Brooks et al. (2017)</a>. MESA version 5118.</p> <p>Publication DOI: <a href="https://doi.org/10.3847/2041-8213/834/2/L9">10.3847/2041-8213/834/2/L9</a></p>
Models of low-mass helium white dwarfs including gravitational settling, thermal and chemical diffusion, and rotational mixing⋆
<p>MESA inlists, data (from a single run: rotation + diffusion, M1=1.4, M2=1.2, Porb=3.4 days, Z=0.02) and run_star_extras associated with <a href="http://adsabs.harvard.edu/abs/2016A%26A...595A..35I">Istrate et. al 2016</a>. MESA version 7624. The grid of models produced in this paper can be found <a href="http://adsabs.harvard.edu/abs/2016yCat..35950035I">here</a>.</p>
Heat transport and convective velocities in compositionally-driven convection in neutron star and white dwarf interiors
<p>MESA (version r22.11.1) inlists and source code used for the paper "Heat transport and convective velocities in compositionally-driven convection in neutron star and white dwarf interiors". cool_wd.zip contains the MESA files to reproduce the results discussed in section 4 of the paper. A Python-based Dedalus v3 script to reproduce the 3D numerical simulations presented in section 3 of the paper is included as Compositionally_driven_convection_3D_shell.py.</p>
Planets or asteroids? A geochemical method to constrain the masses of White Dwarf pollutants (video)
<p>The PLATO mission will discover a large number of terrestrial exoplanets, providing measurements of their radii. However, to determine whether an exoplanet is ‘Earth-like’, we must also understand its geological composition. The composition of a planet has wide ranging implications for its subsequent evolution and habitability. Ground-based follow-up to the PLATO detections can constrain planet masses and inform our knowledge of planetary interiors. In this talk, I will discuss a complimentary technique that can further improve our understanding of planetary composition and the geology of rocky exoplanets.</p> <p>Polluted white dwarfs which have accreted fragments of rocky objects provide a unique opportunity to probe exoplanetary interiors. These accreted fragments are often rich in either core-like or mantle-like material, which inform us about the core and mantle compositions we can expect to find in exoplanetary bodies.</p> <p>In this talk, I will present an approach to modelling the abundances of non-Earth-like core and mantle compositions observed in polluted white dwarfs. We use data from metal-silicate partitioning experiments to calculate the effect of non-Earth-like conditions on the distribution of elements between the core and the mantle. The resulting non-Earth-like compositions may be useful for interior structure models of exoplanets.</p>
The detonation of a sub-Chandrasekhar-mass white dwarf at the origin of the low-luminosity Type Ia supernova 1999by
<p>Multi-epoch spectra of the MCh model DDC25 and the sub-MCh model SCH2p0 used to confront to SN 1999by observations in <a href="https://ui.adsabs.harvard.edu/abs/2018MNRAS.474.3931B">Blondin et al. 2018, MNRAS, 474, 3931</a>. These files also include the input hydrodynamical models at 0.5 d (for DDC25) and 0.75 d (for SCH2p0) past explosion.</p>
HST Ultraviolet Detection of Hot White Dwarf Companions to Blue Lurkers in M67
<p>We present the results of our Hubble Space Telescope far-ultraviolet survey of the blue lurkers (BLs) in M67. We find evidence for two white dwarf companions among the BLs that are indicative of mass transfer from an evolved companion, one in WOCS 14020 and the other in WOCS 3001. The cooling ages of the white dwarfs suggest that mass transfer in these systems occurred ~300--540 Myr and ~600--900 Myr ago, respectively. The rotation periods and cooling ages of the BLs are consistent with spin-up and subsequent single-star spin-down models, and binary evolution models yield plausible evolutionary pathways to both BLs via highly non-conservative mass transfer. We conclude that the BLs are lower-luminosity analogues to the classical blue stragglers.</p> <p>These are the inlists and starting models corresponding to our best-fit MESA models to both WOCS 14020 and WOCS 3001.</p>
MESA files for "Supernova Shocks Cannot Explain the Inflated State of Hypervelocity Runaways from White Dwarf Binaries"
<p>MESA inlists and output files for the paper "Supernova Shocks Cannot Explain the Inflated State of Hypervelocity Runaways from White Dwarf Binaries" .</p> <p>Averaged 1-dimensional Arepo outputs for the donor and the runaway are also provided.</p> <p>The Readme.txt provides details about how to run the models, and also the main parameters in run_stars_extras.</p> <p>MESA version: mesa-r23.05.1<br>MESA sdk version: mesasdk-x86_64-linux-22.6.1</p>
Hypoxia effect on embryonic hearts of Tibetan Chicken, Dwarf Recessive White Chicken and Shouguang Chicken
GEO Series GSE12675. Gallus gallus. 12 samples. Type: Expression profiling by array.
McCook-Sion White Dwarf Catalog (Web Version)
The Web Version of the McCook-Sion White Dwarf Catalog contains in excess of 500 more entries than the previous published version, the 4th Edition (1999) of the Villanova White Dwarf Catalog. It is a catalog of white dwarfs which have been identified spectroscopically. For each degenerate star, the following data entries with references are provided: (1) catalog coordinate designation or WD number, (2) the right ascension and declination, (3) the spectral type based upon the new system, (4) a catalog symbol denoting binary membership, (5) proper motion and position angle, (6) broad-band UBV Photometry, V, B-V, U-B, (7) multichannel spectrophotometry, V(MC), g-r, (8) Stromgren narrow-band photometry y, b-y, u-b, (9) an absolute visual magnitude based upon the best available color-magnitude calibration or trigonometric parallax, (10) the observed radial velocity uncorrected for gravitational redshift or solar motion, and (11) the trigonometric parallax, with mean error, when available. Note that finding charts for many of the white dwarfs present in this catalog can be found at the following URLs: <pre> <a href="http://procyon.lpl.arizona.edu/WD/charts/">http://procyon.lpl.arizona.edu/WD/charts/</a> <a href="http://deneb.astro.warwick.ac.uk/phsaap/wdcharts/">http://deneb.astro.warwick.ac.uk/phsaap/wdcharts/</a> </pre> The second URL contains the finding charts from T.R. Marsh. This is list with about 600 charts. The University of Arizona charts currently have about 2000 charts, but that list is a work in progress with the intent of eventually having all charts available. As discussed in more detail in the HEASARC_Implementation section, this HEASARC representation of the White Dwarf Catalog contains only a subset of the data presented in either the printed version or the version available at the Villanova website, but is intended to be suitable for cross-identification purposes with other catalogs, e.g., of X-ray sources. The original sources for this catalog should always be consulted for the full set of information that is available for these white dwarfs. This database table is based on the Web version of the Villanova White Dwarf Catalog. It was initially created by the HEASARC in May 2003. It is based on the files WD00-07.txt, WD08-15.txt, WD16-23.txt, and WDNewStars.txt obtained from <pre> <a href="ftp://astronomy.villanova.edu/mccook/Current%20Web%20Version%20of%20WD%20Catalog/">ftp://astronomy.villanova.edu/mccook/Current%20Web%20Version%20of%20WD%20Catalog/</a> </pre> It is automatically updated periodically whenever the catalog's authors update these files. This is a service provided by NASA HEASARC .
ROSAT All-Sky Survey: White Dwarfs
This database table lists all white dwarf stars, both previously-cataloged and newly discovered, which have been detected in the ROSAT All-Sky Survey. The positions and count rates of the X-ray sources associated with each star are given, as well as spectral types and other star names for those stars which have been previously cataloged. This database table also lists distances estimated via Balmer line profile fitting, corrected (for IS absorption) X-ray luminosities, and each star's contribution to the X-ray luminosity function for all DA white dwarfs which were detected in the ROSAT All-Sky Survey. This is a service provided by NASA HEASARC .
Sloan Digital Sky Survey DR7 White Dwarf Catalog
This table contains a new catalog of spectroscopically confirmed white dwarf stars from the Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7) spectroscopic catalog. The authors find 20,407 white dwarf spectra, representing 19,712 stars, and provide atmospheric model fits to 14,120 DA and 1011 DB white dwarf spectra from 12,843 and 923 stars, respectively. These numbers represent more than a factor of two increase in the total number of white dwarf stars from the previous SDSS white dwarf catalogs based on DR4 data. The distribution of subtypes varies from previous catalogs due to the authors' more conservative, manual classifications of each star in our catalog, supplementing their automatic fits. In particular, they find a large number of magnetic white dwarf stars whose small Zeeman splittings mimic increased Stark broadening that would otherwise result in an overestimated log g if fit as a non-magnetic white dwarf. The authors calculate mean DA and DB masses for their clean, non-magnetic sample and find the DB mean mass is statistically larger than that for the DAs. This table lists the 20,407 white dwarf spectra corresponding to 19,712 distinct stars. This table was created by the HEASARC in January 2013 based on the electronic version of Table 2 from the reference paper which was obtained from the ApJS web site. One duplicate entry was removed from the table in June 2019. This is a service provided by NASA HEASARC .
Sloan Digital Sky Survey DR10 New White Dwarf Catalog
The authors report the discovery of 9,088 new spectroscopically confirmed white dwarfs and subdwarfs in the Sloan Digital Sky Survey (SDSS) Data Release 10 (DR10). They obtain T<sub>eff</sub>, log g and masses for hydrogen-atmosphere white dwarf stars (DAs) and helium-atmosphere white dwarf stars (DBs), and estimate the calcium/helium abundances for the white dwarf stars with metallic lines (DZs) and carbon/helium for carbon-dominated spectra (DQs). They found 1 central star of a planetary nebula, 2 new oxygen spectra on helium-atmosphere white dwarfs, 71 DQs, 42 hot DO/PG1159s, 171 white dwarf+main-sequence star binaries, 206 magnetic DAHs, 327 continuum-dominated DCs, 397 metal-polluted white dwarfs, 450 helium-dominated white dwarfs, 647 subdwarfs and 6887 new hydrogen-dominated white dwarf stars. The targeted white dwarfs were required to be point sources with clean photometry, and to have USNO-B Catalog counterparts (Monet et al.. 2003, AJ, 125, 984, <a href="https://cdsarc.cds.unistra.fr/ftp/cats/I/284">CDS Cat. I/284</a>). They were also restricted to regions inside the DR7 imaging footprint and required to have colors within the ranges g < 19.2, (u-r) < 0.4, -1 < (u-g) < 0.3, -1 < (g-r) < 0.5 and to have low Galactic extinction A<sub>r</sub> < 0.5 mag. Additionally, targets that did not have (u-r) < -0.1 and (g-r) < -0.1 were required to have USNO proper motions larger than 2 arcseconds per century (20 milliarcseconds per year). Objects satisfying the selection criteria that had not been observed previously by the SDSS were denoted by the WHITEDWARF_NEW target flag, while those with prior SDSS spectra are assigned the WHITEDWARF_SDSS flag. Some of the latter were re-observed with BOSS in order to obtain the extended wavelength coverage that the BOSS spectrograph offers. The color selection used includes DA stars with temperatures above ~14,000 K, helium-atmosphere white dwarfs above ~8000 K, as well as many rarer classes of white dwarfs. Hot subdwarfs (sdB and sdO) were targeted as well. Note that this catalog does not include stars from the earlier SDSS white dwarf catalogs, e.g., Eisenstein et al. (2006, ApJS, 167, 40, available in the HEASARC database as the SDSSDWDSD table), Kleinman et al. (2013, ApJS, 205, 5, available in the HEASARC database as the SDSSDR7WD table).. This table was created by the HEASARC in October 2017 based on an electronic version of Table 6 from the reference paper which was obtained from the CDS as their catalog J/MNRAS/446/4078 file table6.dat. This is a service provided by NASA HEASARC .
ScienceDex guides
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These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.