Results 111 to 120 of about 2,016,206 (398)
An irradiated brown-dwarf companion to an accreting white dwarf [PDF]
Nature, 2016 Brown dwarfs and giant planets orbiting close to a host star are subjected to significant irradiation that can modify the properties of their atmospheres. In order to test the atmospheric models that are used to describe these systems, it is necessary to obtain accurate observational estimates of their physical properties (masses, radii, temperatures ...
S. P. Littlefair +10 more
openaire +9 more sources
Testing the white dwarf mass-radius relationship with eclipsing binaries [PDF]
, 2017 We present high-precision, model-independent, mass and radius measurements for 16 white dwarfs in detached eclipsing binaries and combine these with previously published data to test the theoretical white dwarf mass–radius relationship.
S. Parsons +19 more
semanticscholar +1 more source
Insect I‐Type Lysozymes Function as Antiviral Proteases by Forming Biomolecular Condensates
Advanced Science, EarlyView.Upon rice viral infection, the insect vector activates the Toll–MyD88–Dorsal signaling cascade, inducing i‐type lysozyme (Lyz‐I1) expression. Lyz‐I1 functions as an antiviral protease through its conserved catalytic dyad Glu/Asp (E/D), mediating cleavage of viral proteins at specific Lys (K) residues.
Yu Du +5 more
wiley +1 more source
The White Dwarf in EM Cygni: Beyond The Veil
, 2009 We present a spectral analysis of the FUSE spectra of EM Cygni, a Z Cam DN system. The FUSE spectrum, obtained in quiescence, consists of 4 individual exposures (orbits): two exposures, at orbital phases phi ~ 0.65 and phi ~ 0.90, have a lower flux; and ...
Agafonov +32 more
core +1 more source
The mass ratio distribution of short period double degenerate stars [PDF]
, 2002 Short period double degenerates (DDs) are close white dwarf - white dwarf binary stars which are the result of the evolution of interacting binary stars.
Marsh, T. R. +2 more
core +2 more sources
White Dwarf Crystallization [PDF]
International Astronomical Union Colloquium, 1994 AbstractThe inclusion of a detailed treatment of solidification processes in the cooling theory of carbon–oxygen white dwarfs is of crucial importance for the determination of their luminosity function. Carbon–oxygen separation at crystallization yields delays larger than 2 Gyr to cool down to luminosities corresponding to the observed cut–off.
Enrique García-Berro, M. Hernanz
openaire +2 more sources
The Halo White Dwarf Population [PDF]
The Astrophysical Journal, 1998 29 pages (AASTeX), 7 eps figures included, accepted for publication in ...
Enrique García-Berro +4 more
openaire +3 more sources
Unstable low-mass planetary systems as drivers of white dwarf pollution [PDF]
, 2017 At least 25 percent of white dwarfs show atmospheric pollution by metals, sometimes accompanied by detectable circumstellar dust/gas discs or (in the case of WD 1145+017) transiting disintegrating asteroids.
A. Mustill +4 more
semanticscholar +1 more source
Polarimetric evidence of a white dwarf pulsar in the binary system AR Scorpii [PDF]
Nature Astronomy, 2016 The variable star AR Scorpii (AR Sco) was recently discovered to pulse in brightness every 1.97 min from ultraviolet wavelengths into the radio regime. The system is composed of a cool, low-mass star in a tight, 3.55-hour orbit with a more massive white ...
D. Buckley +4 more
semanticscholar +1 more source
Unraveling Alkali Ion Electron Donation for Enhancing Heterogeneous Catalytic Oxidation
Advanced Science, EarlyView.A new mechanistic pathway for potassium (K) ions as electron donors is identified by constructing single K ion chains confined within hexagonal WO3 tunnels. The as‐produced high‐electron‐density Kδ+ (0<δ<1) ions not only facilitate the formation of oxygen vacancies that behave classical electronic effect but, more importantly, also directly donate ...
Jin Wang +6 more
wiley +1 more source