KOI-54: The Remarkable Pulsating, Periastron-Pumped Binary Star

Details KOI-54: The Remarkable Pulsating, Periastron-Pumped Binary Star KOI-54: The Remarkable Pulsating, Periastron-Pumped Binary Star

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21710307w&link_type=abstract

American Astronomical Society, AAS Meeting #217, #103.07; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

A previously-known unremarkable A star has been discovered by Kepler to be a fascinating object: KOI-54 exhibits sharp brightening events every 42 days and a beat-pattern of pulsations locked in phase with the brightenings. We have determined that this is a highly eccentric face-on binary star system and the brightenings are due to tidal distortion plus mutual irradiation of the stars at periastron passage. The periodic driving produces a rich set of tidally-induced g-mode pulsations locked to the orbital period. We present spectral analysis, radial velocities, the exquisite Kepler photometry of KOI-54, and a model that successfully reproduces these observations.
Kepler was selected as the 10th mission of the Discovery Program. Funding for this mission is provided by NASA, Science Mission Directorate.

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