Bulletin of the American Physical Society
2007 APS April Meeting
Volume 52, Number 3
Saturday–Tuesday, April 14–17, 2007; Jacksonville, Florida
Session J3: Compact Inspirals |
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Sponsoring Units: DAP Chair: James Ryan, University of New Hampshire Room: Hyatt Regency Jacksonville Riverfront Grand 2 |
Sunday, April 15, 2007 10:30AM - 11:06AM |
J3.00001: The Double Pulsar Invited Speaker: The double pulsar PSR J0737-3039A/B is a unique laboratory for precision tests of strong-field gravity, with the pulsars' mass ratio available in addition to five ``post-Keplerian'' relativistic effects. We have recently shown that the most precisely measured parameters are consistent with the predictions of general relativity to within 0.05\%, the most stringent test to date in the strong-field regime. Furthermore, consideration of the binary system's low space velocity leads to the conclusion that the progenitor of the second-born pulsar was most likely a Helium star of less than 2 solar masses which suffered only a small asymmetric kick during its supernova explosion. [Preview Abstract] |
Sunday, April 15, 2007 11:06AM - 11:42AM |
J3.00002: Compact Binary Inspirals and Gravity Waves Invited Speaker: The evolution of compact astrophysical binaries during their closest approach---while fundamentally driven by gravity wave emission----can be strongly influenced by a myriad of other physics. These physics include, but are not limited to, the effects of mass transfer, systematic losses of angular momentum, and tidal interactions between the two components. How these physics influence a binary's evolution directly impacts its gravity wave signal evolution, providing opportunities for gravity wave observations to contribute to our understanding of the relevant physics. Here I will discuss how some of these physics enter into compact binary evolution and how this impacts their gravity wave signal, focusing throughout on ways gravity wave observations may contribute to our understanding of these physics. [Preview Abstract] |
Sunday, April 15, 2007 11:42AM - 12:18PM |
J3.00003: Compact white dwarf binaries as sources of gravitational waves Invited Speaker: Interacting binaries involving a compact stellar remnant produce the bulk of the energetic objects found in our galaxy. But such compact systems are also expected to make a dominant contribution to the galactic gravitational wave emission. I will briefly summarize the formation and evolution of such systems and focus on the dominant source population: binaries containing white dwarfs. Depending on the makeup of the two stars in the binary, some are expected to merge on short timescales, others can exchange mass for giga-years, and yet others may be able to detonate the white dwarf to produce a Type Ia supernova. Efforts are underway to survey the galaxy and provide a census of the compact binary population using a variety of wavebands. These include large optical surveys of the galactic plane, the large number of sources identified through their X-ray emission as well as serendipitous discoveries in extra-galactic surveys such as the SDSS. These surveys allow us to both identify individual systems, but also provides important constraints on the unresolved background emission from all these binaries. Our multi-wavelength arsenal of telescopes allows us to characterize such sources and derive crucial system parameter estimates such as the masses and compositions of the stars. I illustrate recently identified systems with orbital periods of only minutes that are expected to be the strongest galactic sources of gravitational waves that will be crucial for facilities such as LISA. [Preview Abstract] |
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