منابع مشابه
PHL 5038 : A spatially resolved white dwarf + brown dwarf binary
A near-infrared excess is detected at the white dwarf PHL 5038 in UKIDSS photometry, consistent with the presence of a cool, substellar companion. We have obtained Hand K-grism spectra and images of PHL 5038 using NIRI on Gemini North. The target is spatially and spectrally resolved into two components; an 8000 K DA white dwarf, and a likely L8 brown dwarf companion, separated by 0.94 ′′. The s...
متن کاملθ Hya : spectroscopic identification of a second B star + white dwarf binary
We report the identification, in an Extreme Ultraviolet Explorer (EUVE) spectrum, of a hot white dwarf companion to the 3rd magnitude late-B star θ Hya (HR3665, HD79469). This is the second B star+white dwarf binary to be conclusively identified; Vennes et al. (1997), and Burleigh & Barstow (1998) had previously reported the spectroscopic discovery of a hot white dwarf companion to the B5V star...
متن کاملThe first binary star evolution model producing a Chandrasekhar mass white dwarf
Today, Type Ia supernovae are essential tools for cosmology, and recognized as major contributors to the chemical evolution of galaxies. The construction of detailed supernova progenitor models, however, was so far prevented by various physical and numerical difficulties in simulating binary systems with an accreting white dwarf component, e.g., unstable helium shell burning which may cause sig...
متن کاملThe Possible White Dwarf{neutron Star Connection
The current status of the problem of whether neutron stars can form, in close binary systems, by accretion{induced collapse (AIC) of white dwarfs is examined. We nd that, in principle, both initially cold C+O white dwarfs in the high{mass tail of their mass distribution in binaries and O+Ne+Mg white dwarfs can produce neutron stars. Which fractions of neutron stars in diierent types of binaries...
متن کاملDetached white dwarf main-sequence star binaries
We initiated a comprehensive state of the art binary population synthesis study of white dwarf main-sequence star (WDMS) binaries to serve as a foundation for subsequent studies on pre-cataclysmic variables, double white dwarfs, and white dwarf + B-star binaries. We considered seven distinct formation channels subdivided into three main groups according to the evolutionary process that gives ri...
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ژورنال
عنوان ژورنال: Nature
سال: 2016
ISSN: 0028-0836,1476-4687
DOI: 10.1038/nature18620