General relativistic effects in the structure of massive white dwarfs
Sign Up to like & getrecommendations! Published in 2018 at "General Relativity and Gravitation"
DOI: 10.1007/s10714-018-2354-8
Abstract: In this work we investigate the structure of white dwarfs using the Tolman–Oppenheimer–Volkoff equations and compare our results with those obtained from Newtonian equations of gravitation in order to put in evidence the importance of… read more here.
Keywords: dwarfs; white dwarfs; massive white; radius ... See more keywords
M dwarfs found in the first Byurakan spectral sky survey database. Gaia EDR3 and TESS data. Some preliminary results
Sign Up to like & getrecommendations! Published in 2023 at "Publications of the Astronomical Society of Australia"
DOI: 10.1017/pasa.2023.20
Abstract: Abstract In order to gain more information on the 236 M dwarfs identified in the First Byurakan Survey (FBS) low-resolution (lr) spectroscopic database, Gaia EDR3 high-accuracy astrometric and photometric data and Transiting Exoplanet Survey Satellite… read more here.
Keywords: database gaia; gaia edr3; dwarfs; survey ... See more keywords
Black dwarf supernova in the far future
Sign Up to like & getrecommendations! Published in 2020 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/staa2262
Abstract: In the far future long after star formation has ceased the universe will be populated by sparse degenerate remnants, mostly white dwarfs, though their ultimate fate is an open question. These white dwarfs will cool… read more here.
Keywords: dwarfs; white dwarfs; far future; supernova ... See more keywords
Formation of dwarf galaxies in major gas-rich disc–disc mergers
Sign Up to like & getrecommendations! Published in 2021 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stab672
Abstract: Galaxies usually follow a mass–metallicity relation, where higher mass galaxies are typically more metal-rich than lower mass galaxies. Yet, tidal dwarf galaxies are outliers to this relation. These kinds of dwarfs are formed in galactic… read more here.
Keywords: disc; dwarfs; dwarf galaxies; gas rich ... See more keywords
Surveying nearby brown dwarfs with HGCA: Direct imaging discovery of a faint, high-mass brown dwarf orbiting HD 176535 A
Sign Up to like & getrecommendations! Published in 2023 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stad1315
Abstract: Brown dwarfs with well-measured masses, ages and luminosities provide direct benchmark tests of substellar formation and evolutionary models. We report the first results from a direct imaging survey aiming to find and characterize substellar companions… read more here.
Keywords: dwarf; high mass; direct imaging; dwarfs ... See more keywords
Optical and near-infrared linear polarization of low and intermediate-gravity ultra-cool dwarfs
Sign Up to like & getrecommendations! Published in 2017 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stw3278
Abstract: We aim to study the optical and near-infrared linear polarimetric properties of a sample of young M7-L7 dwarfs ($\approx$1-500 Myr) with spectroscopic signatures of low- and intermediate-gravity atmospheres. We collected optical ($RIZ$) and near-infrared ($YJHK_{\rm… read more here.
Keywords: dwarfs; linear polarization; near infrared; gravity ... See more keywords
Four new massive pulsating white dwarfs including an ultramassive DAV
Sign Up to like & getrecommendations! Published in 2017 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stx320
Abstract: We report the discovery of four massive ($M > 0.8\,M_\odot$) ZZ Ceti white dwarfs, including an ultramassive $1.16\,M_\odot$ star. We obtained ground based, time-series photometry for thirteen white dwarfs from the Sloan Digital Sky Survey… read more here.
Keywords: dwarfs; white dwarfs; including ultramassive; odot ... See more keywords
Parallaxes and Infrared Photometry of three Y0 dwarfs
Sign Up to like & getrecommendations! Published in 2017 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stx723
Abstract: We have followed up the three Y0 dwarfs WISEPA J041022.71+150248.5, WISEPA J173835.53+273258.9 and WISEPC J205628.90+145953.3 using the United Kingdom Infrared Telescope Wide Field Camera. We find parallaxes that are more consistent and accurate than previously… read more here.
Keywords: dwarfs; photometry three; parallaxes infrared; three dwarfs ... See more keywords
The sdA problem – III. New extremely low-mass white dwarfs and their precursors fromGaiaastrometry
Sign Up to like & getrecommendations! Published in 2018 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/sty2979
Abstract: The physical nature of the sdA stars---cool hydrogen-rich objects with spectroscopic surface gravities intermediate between main sequence and canonical mass white dwarfs---has been elusive since they were found in Sloan Digital Sky Survey Data Release… read more here.
Keywords: mass white; dwarfs; white dwarfs; main sequence ... See more keywords
Dwarf galaxies in CDM, WDM, and SIDM: disentangling baryons and dark matter physics
Sign Up to like & getrecommendations! Published in 2019 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stz2613
Abstract: We present a suite of FIRE-2 cosmological zoom-in simulations of isolated field dwarf galaxies, all with masses of $M_{\rm halo} \approx 10^{10}\, {\rm M}_{\odot }$ at z = 0, across a range of dark matter models.… read more here.
Keywords: dwarfs; matter; dark matter; physics ... See more keywords
K2 Ultracool Dwarfs Survey – V. High superflare rates on rapidly rotating late-M dwarfs
Sign Up to like & getrecommendations! Published in 2019 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stz886
Abstract: We observed strong superflares (defined as flares with energy in excess of 1033 erg) on three late-M dwarfs: 2MASS J08315742+2042213 (hereafter 2M0831+2042; M7 V), 2MASS J08371832+2050349 (hereafter 2M0837+2050; M8 V), and 2MASS J08312608+2244586 (hereafter 2M0831+2244; M9 V). 2M0831+2042… read more here.
Keywords: dwarfs; energy; 2m0837 2050; 2m0831 2042 ... See more keywords