Modeling the Orbital Sampling Effect of Extrasolar Moons

René Heller (1), Michael Hippke (2), Brian Jackson (3,4) ((1) Max Planck Institute for Solar System Research, Göttingen (GER), (2) Neukirchen-Vluyn (GER) (3) Carnegie Department of Terrestrial Magnetism, Washington DC (USA), (4) Boise State University, Boise ID (USA))
(Submitted on 23 Mar 2016)

The orbital sampling effect (OSE) appears in phase-folded transit light curves of extrasolar planets with moons. Analytical OSE models have hitherto neglected stellar limb darkening and non-zero transit impact parameters and assumed that the moon is on a circular, co-planar orbit around the planet. Here, we present an analytical OSE model for eccentric moon orbits, which we implement in a numerical simulator with stellar limb darkening that allows for arbitrary transit impact parameters. We also describe and publicly release a fully numerical OSE simulator (PyOSE) that can model arbitrary inclinations of the transiting moon orbit. Both our analytical solution for the OSE and PyOSE can be used to search for exomoons in long-term stellar light curves such as those by Kepler and the upcoming PLATO mission. Our updated OSE model offers an independent method for the verification of possible future exomoon claims via transit timing variations and transit duration variations. Photometrically quiet K and M dwarf stars are particularly promising targets for an exomoon discovery using the OSE.

Comments: published in ApJ; 11 figures (8 b/w, 3 col); OSE simulator available at this https URL
Subjects: Earth and Planetary Astrophysics (astro-ph.EP)
Journal reference: The Astrophysical Journal (2016) 820, 88
DOI: 10.3847/0004-637X/820/2/88
Cite as: arXiv:1603.07112 [astro-ph.EP] (or arXiv:1603.07112v1 [astro-ph.EP] for this version)
Submission history
From: René Heller
[v1] Wed, 23 Mar 2016 10:05:11 GMT (2193kb)
http://arxiv.org/abs/1603.07112