Results 111 to 120 of about 1,914,179 (372)

Measuring the Mass–Radius Relation of White Dwarfs Using Wide Binaries

The Astrophysical Journal
Measuring the mass–radius relation of individual white dwarfs is an empirically challenging task that has been performed for only a few dozen stars. We measure the white dwarf mass–radius relation using the gravitational redshifts and radii of 135 white ...
Stefan Arseneau, Vedant Chandra, Hsiang-Chih Hwang, Nadia L. Zakamska, Gautham Adamane Pallathadka, Nicole R. Crumpler, J. J. Hermes, Kareem El-Badry, Hans-Walter Rix, Keivan G. Stassun, Boris T. Gänsicke, Joel R. Brownstein, Sean Morrison   +12 more
doaj   +1 more source

A Chondritic Solar Neighborhood

The Planetary Science Journal, 2023
A persistent question in exoplanet demographics is whether exoplanetary systems form from similar compositional building blocks to our own. Polluted white dwarf stars offer a unique way to address this question, as they provide measurements of the bulk ...
Isabella L. Trierweiler, Alexandra E. Doyle, Edward D. Young   +2 more
doaj   +1 more source

X-Ray Emissions from Accreting White Dwarfs: A Review [PDF]

, 2017
Interacting binaries in which a white dwarf accretes material from a companion—cataclysmic variables (CVs) in which the mass donor is a Roche-lobe filling star on or near the main sequence, and symbiotic stars in which the mass donor is a late type giant—
K. Mukai
semanticscholar   +1 more source

Resistance Drift of Phase Change Materials Beyond the Power Law

Advanced Electronic Materials, EarlyView.
The timedependent resistance of phase change materials is important for their application as electronic memory. Here, resistance measurements of melt‐quenched germanium telluride from nanoseconds to minutes are presented. By going far beyond the usually considered measurement regime, deviations from the ubiquitous power law behavior are observed, that ...
Jakob Ballmaier, Sebastian Walfort, Martin Salinga   +2 more
wiley   +1 more source

Cool DZ white dwarfs – I. Identification and spectral analysis [PDF]

, 2017
White dwarfs with metal lines in their spectra act as signposts for post-main sequence planetary systems. Searching the Sloan Digital Sky Survey (SDSS) data release 12, we have identified 231 cool ( 300 kms-1.
M. Hollands, D. Koester, V. Alekseev, E. Herbert, B. Gaensicke   +4 more
semanticscholar   +1 more source

Gaiaphotometry for white dwarfs [PDF]

Astronomy & Astrophysics, 2014
Context. White dwarfs can be used to study the structure and evolution of the Galaxy by analysing their luminosity function and initial mass function. Among them, the very cool white dwarfs provide the information for the early ages of each population.
Piotr M. Kowalski, Carme Jordi, Silvia Catalan, Silvia Catalan, J. M. Carrasco, Ralf Napiwotzki, Annie C. Robin, Pier-Emmanuel Tremblay, Xavier Luri   +8 more
openaire   +7 more sources

Unique Na5−xSbSe Phase Enables High‐Rate Performance of Sb2Se3 Anodes in Na‐Ion Batteries

Advanced Energy Materials, EarlyView.
The (de)sodiation mechanism of Sb2Se3 is revealed through advanced operando techniques and ab initio simulations and underscores the value of complementary methods in exploring battery mechanisms. A new Na5−xSbSe phase is identified as the final sodiation product of Sb2Se3 anodes in Na‐ion batteries (NIBs), which enables the remarkably high‐rate ...
Amalie Skurtveit, Andrew Pastusic Jr., Anders Brennhagen, Faduma M. Maddar, Chris Erik Mohn, Abhoy Karmakar, Christopher A. O'Keefe, Ivana Hasa, Carmen Cavallo, Bjørnar Arstad, Helmer Fjellvåg, David S. Wragg, Alexey Y. Koposov   +12 more
wiley   +1 more source

Detection of the Temperature Dependence of the White Dwarf Mass–Radius Relation with Gravitational Redshifts

The Astrophysical Journal
Models predict that the well-studied mass–radius relation of white dwarf stars depends on the temperature of the star, with hotter white dwarfs having larger masses at a given radius than cooler stars.
Nicole R. Crumpler, Vedant Chandra, Nadia L. Zakamska, Gautham Adamane Pallathadka, Stefan Arseneau, Nicola Gentile Fusillo, J. J. Hermes, Carles Badenes, Priyanka Chakraborty, Boris T. Gänsicke, Stephen P. Schmidt   +10 more
doaj   +1 more source

Recent Results from Infrared Observations of White Dwarfs, their Companions, and the Dust that Surrounds Them [PDF]

, 2007
Although "traditionally" observed at short wavelengths, white dwarfs have displayed many surprising features when probed in the infrared. We present an overview of recent results from ground- and space-based near- to mid-infrared observations of white ...
Brinkworth, C. S., Hoard, D. W., Wachter, S.   +2 more
core  

Discovery of New Ultracool White Dwarfs in the Sloan Digital Sky Survey

, 2004
We report the discovery of five very cool white dwarfs in the Sloan Digital Sky Survey (SDSS). Four are ultracool, exhibiting strong collision induced absorption (CIA) from molecular hydrogen and are similar in color to the three previously known coolest
Atsuko Nitta, Dan Long, Don Q. Lamb, Eric H. Neilsen, Jr., Evalyn Gates, Geza Gyuk, Howard Brewington, Hugh C. Harris, J. Brinkmann, James Liebert, Jorgensen U. G., Jurek Krzesinski, Mark Subbarao, Michael Harvanek, Peter R. Newman, S. J. Kleinman, Scott Anderson, Stephanie A. Snedden   +17 more
core   +2 more sources