Results 71 to 80 of about 1,989,293 (378)

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, R. Martin, M. Livio, S. Lubow   +3 more
semanticscholar   +1 more source

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, A. M. Crews, R. C. Highley, L. K. Deale   +3 more
doaj   +1 more source

The Mystery Deepens: Spitzer Observations of Cool White Dwarfs [PDF]

, 2006
We present 4.5$\mu$m and 8$\mu$m photometric observations of 18 cool white dwarfs obtained with the Spitzer Space Telescope. Our observations demonstrate that four white dwarfs with T_eff< 6000 K show slightly depressed mid-infrared fluxes relative to ...
Adam Burrows, Borysow A., D. E. Winget, Fergal Mullally, Jorgensen U. G., Marc J. Kuchner, Mukremin Kilic, Ted von Hippel, Wickramasinghe D. T., William T. Reach   +9 more
core   +3 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, J. Hermes, E. Dennihy, B. Dunlap, P. Izquierdo, P. Tremblay, P. Cho, Boris T Gaensicke, O. Toloza, K. Bell, Michael H. Montgomery, D. Winget   +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, B. Gänsicke, Stefan Hümmerich, F. Hambsch, K. Bernhard, C. Lloyd, E. Breedt, E. Stanway, D. Steeghs, S. Parsons, O. Toloza, M. Schreiber, P. Jonker, P. Jonker, J. Roestel, T. Kupfer, A. Pala, V. Dhillon, V. Dhillon, V. Dhillon, L. Hardy, S. Littlefair, A. Aungwerojwit, S. Arjyotha, D. Koester, J. Bochiński, C. Haswell, P. Frank, P. Wheatley   +28 more
semanticscholar   +1 more source

Electromagnetic Characterization of the LISA Verification Binary ZTF J0526+5934

The Astrophysical Journal, 2023
We present an analysis of new and archival data to the 20.506 minute LISA verification binary J052610.42+593445.32 (J0526+5934). Our joint spectroscopic and photometric analysis finds that the binary contains an unseen M _1 = 0.89 ± 0.11 M _⊙ CO-core ...
Alekzander Kosakowski, Thomas Kupfer, P. Bergeron, Tyson B. Littenberg   +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., Clemens, J. C., Dennihy, E., Dunlap, B. H., Gaensicke, B. T., Hermes, J. J., Kawaler, Steven D., Kepler, S. O., Montgomery, M. H., Redfield, S., Romero, A. D., Tremblay, P. -E.   +11 more
core   +3 more sources

Prospects for detection of detached double white dwarf binaries with Gaia, LSST and LISA [PDF]

, 2017
Double white dwarf (DWD) binaries are expected to be very common in the Milky Way, but their intrinsic faintness challenges the detection of these systems. Currently, only a few tens of detached DWDs are know.
V. Korol, E. Rossi, P. Groot, G. Nelemans, S. Toonen, Anthony G. A. Brown   +5 more
semanticscholar   +1 more source

A Young Ultramassive White Dwarf in the AB Doradus Moving Group [PDF]

Astrophysical Journal, 2018
We use Gaia Data Release 2 (DR2) kinematic data and white dwarf evolutionary models to determine that the young and ultramassive 1.28 ± 0.08 M⊙ white dwarf GD 50 is a likely member of the AB Doradus moving group (ABDMG).
J. Gagn'e, G. Fontaine, A. Simon, J. Faherty   +3 more
semanticscholar   +1 more source

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, B. Gänsicke, S. Kawaler, S. Greiss, P. Tremblay, N. G. Fusillo, R. Raddi, S. Fanale, K. Bell, E. Dennihy, J. Fuchs, B. Dunlap, J. Clemens, M. Montgomery, D. Winget, P. Chote, T. Marsh, S. Redfield   +17 more
semanticscholar   +1 more source