scholarly journals Probing the dark matter-electron interactions via hydrogen-atmosphere pulsating white dwarfs

2018 ◽  
Vol 98 (10) ◽  
Author(s):  
Jia-Shu Niu ◽  
Tianjun Li ◽  
Weikai Zong ◽  
Hui-Fang Xue ◽  
Yang Wang
Keyword(s):  
Dark Matter ◽  
White Dwarfs ◽  
Hydrogen Atmosphere ◽  
Electron Interactions

scholarly journals Direct detection of atomic dark matter in white dwarfs

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
David Curtin ◽  
Jack Setford
Keyword(s):  
Dark Matter ◽  
Energy Loss ◽  
Cooling Rate ◽  
White Dwarf ◽  
White Dwarfs ◽  
Luminosity Function ◽  
Direct Detection ◽  
Matter Density ◽  
Mixing Parameter ◽  
First Time

Abstract Dark matter could have a dissipative asymmetric subcomponent in the form of atomic dark matter (aDM). This arises in many scenarios of dark complexity, and is a prediction of neutral naturalness, such as the Mirror Twin Higgs model. We show for the first time how White Dwarf cooling provides strong bounds on aDM. In the presence of a small kinetic mixing between the dark and SM photon, stars are expected to accumulate atomic dark matter in their cores, which then radiates away energy in the form of dark photons. In the case of white dwarfs, this energy loss can have a detectable impact on their cooling rate. We use measurements of the white dwarf luminosity function to tightly constrain the kinetic mixing parameter between the dark and visible photons, for DM masses in the range 10−5–105 GeV, down to values of ϵ ∼ 10−12. Using this method we can constrain scenarios in which aDM constitutes fractions as small as 10−3 of the total dark matter density. Our methods are highly complementary to other methods of probing aDM, especially in scenarios where the aDM is arranged in a dark disk, which can make direct detection extremely difficult but actually slightly enhances our cooling constraints.

scholarly journals A Spectroscopic Survey in the EUV of the “Coolest” Hot DA Stars

1996 ◽  
Vol 152 ◽  
pp. 217-222
Author(s):  
Jean Dupuis ◽  
Stéphane Vennes
Keyword(s):  
Effective Temperature ◽  
White Dwarfs ◽  
Heavy Element ◽  
Extreme Ultraviolet ◽  
Diffusion Theory ◽  
Hydrogen Atmosphere ◽  
Element Abundance ◽  
Pure Hydrogen ◽  
Element Abundances ◽  
The One

We present an analysis of the extreme ultraviolet (EUV) spectroscopy of a sample of 10 DA white dwarfs observed by the Extreme Ultraviolet Explorer (EUVE). We have selected white dwarfs cooler than about 50,000 K and with presumably low heavy element abundances. The goal of this study is to determine the fundamental atmospheric parameters, namely the effective temperature and chemical composition, of these stars by fitting their continua with synthetic spectra computed from pure hydrogen LTE/line-blanketed model atmospheres. The question of the presence (or absence) of trace elements is explored by comparing EUV-determined effective temperatures to the one obtained from a fit of hydrogen balmer lines. It is found that the majority of the DA in the sample are consistent with having a pure hydrogen atmosphere. One of the star, MCT0027-634, is another possible example of a HZ 43-type white dwarf, having an effective temperature above 50000 K and a low heavy element abundance, i.e., much lower than predicted by diffusion theory.

scholarly journals Crystal responses to general dark matter-electron interactions

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Riccardo Catena ◽  
Timon Emken ◽  
Marek Matas ◽  
Nicola A. Spaldin ◽  
Einar Urdshals
Keyword(s):  
Dark Matter ◽  
Electron Interactions

scholarly journals Improved treatment of dark matter capture in white dwarfs

2021 ◽  
Vol 2021 (10) ◽  
pp. 083
Author(s):  
Nicole F. Bell ◽  
Giorgio Busoni ◽  
Maura E. Ramirez-Quezada ◽  
Sandra Robles ◽  
Michael Virgato
Keyword(s):  
Dark Matter ◽  
White Dwarfs

scholarly journals Dark-matter admixed white dwarfs

2013 ◽  
Vol 87 (12) ◽  
Author(s):  
S.-C. Leung ◽  
M.-C. Chu ◽  
L.-M. Lin ◽  
K.-W. Wong
Keyword(s):  
Dark Matter ◽  
White Dwarfs

scholarly journals The contribution of red dwarfs and white dwarfs to the halo dark matter

2008 ◽  
Vol 486 (2) ◽  
pp. 427-435 ◽  
Author(s):  
S. Torres ◽  
J. Camacho ◽  
J. Isern ◽  
E. García-Berro
Keyword(s):  
Dark Matter ◽  
White Dwarfs ◽  
Red Dwarfs

scholarly journals White Dwarfs and Planetary Central Stars

1989 ◽  
Vol 131 ◽  
pp. 545-554
Author(s):  
James Liebert
Keyword(s):  
White Dwarf ◽  
White Dwarfs ◽  
High Surface ◽  
Planetary Nebulae ◽  
Hydrogen Atmosphere ◽  
Surface Gravity ◽  
Surface Hydrogen ◽  
Central Stars

Studies of hot white dwarf samples constrain the properties and evolution of planetary nuclei and the nebulae. In particular, the white dwarf and planetary nebulae formation rates are compared. I discuss the overlap of the sequences of white dwarfs having hydrogen (DA) and helium-rich (DO) atmospheres with known central stars of high surface gravity. There is evidence that the hydrogen atmosphere nuclei have “thick” outer hydrogen layers (≳ 10−4 M⊙), but that DA white dwarfs may have surface hydrogen layers orders of magnitude thinner. Finally, a DA planetary nucleus is discussed (0950+139) which has undergone a late nebular ejection; this object may be demonstrating that a hydrogen layer can be lost even after the star has entered the white dwarf cooling sequence.

Sign in / Sign up

Export Citation Format

Share Document