Binary Star Orbits. V. The Nearby White Dwarf/Red Dwarf Pair 40 Eri BC [PDF]
, 2017 A new relative orbit solution with new dynamical masses is determined for the nearby white dwarf–red dwarf pair 40 Eri BC. The period is 230.29 ± 0.68 years.
B. Mason, W. Hartkopf, Korie N. Miles
semanticscholar +1 more source
White dwarf pollution by asteroids from secular resonances [PDF]
Monthly notices of the Royal Astronomical Society, 2018 In the past few decades, observations have revealed signatures of metals polluting the atmospheres of white dwarfs. The diffusion timescale for metals to sink from the atmosphere of a white dwarf is of the order of days for a hydrogen-dominated ...
Jeremy L. Smallwood +3 more
semanticscholar +1 more source
Cooling Process of White Dwarf Stars in Palatini f(R) Gravity
Universe, 2022 A simple cooling model of white dwarf stars is re-analyzed in Palatini f(R) gravity. Modified gravity affects the white dwarf structures and consequently their ages.
Surajit Kalita +2 more
doaj +1 more source
A Dark Spot on a Massive White Dwarf [PDF]
, 2015 We present the serendipitous discovery of eclipse-like events around the massive white dwarf SDSS J152934.98+292801.9 (hereafter J1529+2928). We selected J1529+2928 for time-series photometry based on its spectroscopic temperature and surface gravity ...
Bell, Keaton J. +9 more
core +2 more sources
A White Dwarf with Transiting Circumstellar Material Far outside the Roche Limit
Astrophysical Journal, 2019 We report the discovery of a white dwarf exhibiting deep, irregularly shaped transits, indicative of circumstellar planetary debris. Using Zwicky Transient Facility DR2 photometry of ZTF J013906.17+524536.89 and follow-up observations from the Las ...
Z. Vanderbosch +11 more
semanticscholar +1 more source
A radio-pulsing white dwarf binary star [PDF]
Nature, 2016 White dwarfs are compact stars, similar in size to Earth but approximately 200,000 times more massive. Isolated white dwarfs emit most of their power from ultraviolet to near-infrared wavelengths, but when in close orbits with less dense stars, white ...
T. Marsh +28 more
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Cubic crystal elastic constants of a white dwarf stellar core determined via modal analysis
AIP Advances, 2021 In this work, we present the cubic crystal elastic constants of a fully crystallized white dwarf stellar core. Elastic constants were calculated utilizing modal analysis of three-dimensional single-layer and stratified multi-layer crystalline core models.
K. A. Pestka II +3 more
doaj +1 more source
Evidence from K2 for rapid rotation in the descendant of an intermediate-mass star [PDF]
, 2017 Using patterns in the oscillation frequencies of a white dwarf observed by K2, we have measured the fastest rotation rate, 1.13(02) hr, of any isolated pulsating white dwarf known to date.
Bell, Keaton J. +11 more
core +3 more sources
White Dwarf Rotation as a Function of Mass and a Dichotomy of Mode Line Widths: Kepler Observations of 27 Pulsating DA White Dwarfs through K2 Campaign 8 [PDF]
, 2017 We present photometry and spectroscopy for 27 pulsating hydrogen-atmosphere white dwarfs (DAVs; a.k.a. ZZ Ceti stars) observed by the Kepler space telescope up to K2 Campaign 8, an extensive compilation of observations with unprecedented duration (>75 ...
J. Hermes +17 more
semanticscholar +1 more source
A Photometric and Spectroscopic Investigation of the DB White Dwarf Population Using SDSS and Gaia Data [PDF]
Astrophysical Journal, 2019 We present a comprehensive analysis of DB white dwarfs drawn from the Sloan Digital Sky Survey, based on model fits to ugriz photometry and medium-resolution spectroscopy from the Sloan Digital Sky Survey.
C. Genest-Beaulieu, P. Bergeron
semanticscholar +1 more source