Mathematics – Logic
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21333003r&link_type=abstract
American Astronomical Society, AAS Meeting #213, #330.03; Bulletin of the American Astronomical Society, Vol. 41, p.386
Mathematics
Logic
Scientific paper
White dwarfs in close binary systems play a crucial role in astrophysics. First, close binaries involving white dwarfs account for the vast majority of X-ray binary stars in the Universe (e.g., Magnetic CVs and Supersoft X-ray sources), a number of which are precursors to explosive events such as novae and possibly Type Ia supernovae. Second, binaries consisting of two white dwarfs are predicted to be numerous in the Milky Way (> 108), and are a guaranteed source of gravitational waves for the future gravitational wave observatory LISA. Detailed observations of 1000 double white dwarfs with LISA will enable an unprecedented understanding of white dwarf physics and close binary evolution. Third, binary systems involving one (Single Degenerate) or two (Double Degenerate) white dwarfs are likely to be the progenitors of Type Ia supernovae; the most important standard candles used on cosmological distance scales. Despite the great relevance of SNe Ia to cosmology and chemical evolution of Galaxies, the nature of the progenitor(s) of SNe Ia remains unknown. With the binary evolution population synthesis code StarTrack, important questions pertaining to all three of these aforementioned areas of study have been addressed in my dissertation work. I will present the results of my thesis projects relevant to Galactic centre X-ray sources, the LISA gravitational wave signal from close white dwarf binaries in the Milky Way, and formation channels (and resulting delay times and rates) of possible Type Ia supernovae progenitors. My research is currently supported by a Graduate Research Enhancement Grant and a Merit-Based Enhancement award, both awarded through New Mexico State University.
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