Ellipsoidal Variability in the OGLE Planetary Transit Candidates

Details Ellipsoidal Variability in the OGLE Planetary Transit Candidates Ellipsoidal Variability in the OGLE Planetary Transit Candidates

2003-02-10

arxiv.org/abs/astro-ph/0302175v2

Astrophys.J. 592 (2003) 1217-1224

Astronomy and Astrophysics

Astrophysics

22 pages, 9 figures, discussion enhanced, accepted by ApJ

Scientific paper

10.1086/375735

We analyze the photometry of 117 OGLE stars with periodic transit events for the presence of ellipsoidal light variations, which indicate the presence of massive companions. We find that ~50% of objects may have stellar companions, mostly among the short period systems. In our Table 1 we identify a coefficient of ellipsoidal variability for each star, a_{c2}, which can be used to select prime candidates for planetary searches. There is a prospect of improving the analysis, and the systems with smaller ellipsoidal variability will be identified, when the correlations in the OGLE photometry are corrected for in the future, thereby providing a cleaner list of systems with possible planets.

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