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Asymmetric Transit Curves as Indication of Orbital Obliquity: Clues from the Brown Dwarf Companion in KOI-13

Published online by Cambridge University Press:  23 April 2012

G. M. Szabó
Affiliation:
Konkoly Observatory of the Hungarian Academy of Sciences, P.O. Box 67, H-1525 Budapest, Hungary, email: szgy@konkoly.hu
R. Szabó
Affiliation:
Konkoly Observatory of the Hungarian Academy of Sciences, P.O. Box 67, H-1525 Budapest, Hungary, email: szgy@konkoly.hu
J. M. Benkö
Affiliation:
Konkoly Observatory of the Hungarian Academy of Sciences, P.O. Box 67, H-1525 Budapest, Hungary, email: szgy@konkoly.hu
H. Lehmann
Affiliation:
Thüringer Landessternwarte, 07778 Tautenburg, Germany
G. Mezö
Affiliation:
Konkoly Observatory of the Hungarian Academy of Sciences, P.O. Box 67, H-1525 Budapest, Hungary, email: szgy@konkoly.hu
A. E. Simon
Affiliation:
Konkoly Observatory of the Hungarian Academy of Sciences, P.O. Box 67, H-1525 Budapest, Hungary, email: szgy@konkoly.hu
Z. Kövári
Affiliation:
Konkoly Observatory of the Hungarian Academy of Sciences, P.O. Box 67, H-1525 Budapest, Hungary, email: szgy@konkoly.hu
G. Hodosán
Affiliation:
Konkoly Observatory of the Hungarian Academy of Sciences, P.O. Box 67, H-1525 Budapest, Hungary, email: szgy@konkoly.hu
Z. Regály
Affiliation:
Konkoly Observatory of the Hungarian Academy of Sciences, P.O. Box 67, H-1525 Budapest, Hungary, email: szgy@konkoly.hu
L. L. Kiss
Affiliation:
Konkoly Observatory of the Hungarian Academy of Sciences, P.O. Box 67, H-1525 Budapest, Hungary, email: szgy@konkoly.hu Sydney Institute for Astronomy, School of Physics A28, University of Sydney, NSW 2006, Australia
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Abstract

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Exoplanets orbiting rapidly rotating stars may have unusual light curve shapes. These objects transit across an oblate disk with non-isotropic surface brightness, caused by the gravitational darkening. If such asymmetries are measured, one can infer the orbital obliquity of the exoplanet and the gravity darkened star, even without the analysis of the Rossiter-McLaughlin effect or interferometry. Here we introduce KOI-13 as the first example of a transiting system with a gravity darkened star.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2012

References

Barnes, J. W. 2009, ApJ, 705, 683Google Scholar
Szabó, Gy. M. et al. , 2011, ApJ (Letters), 736, 4Google Scholar
Szabó, Gy. M. & Kiss, L. L. 2011, ApJ (Letters), 727, 44CrossRefGoogle Scholar