Kepler-210: An active star with at least two planets

Abstract

We report the detection and characterization of two short-period, Neptune-sized planets around the active host star Kepler-210. The host star's parameters derived from those planets are (a) mutually inconsistent and (b) do not conform to the expected host star parameters. We furthermore report the detection of transit timing variations (TTVs) in the O-C diagrams for both planets. We explore various scenarios that explain and resolve those discrepancies. A simple scenario consistent with all data appears to be one that attributes substantial eccentricities to the inner short-period planets and that interprets the TTVs as due to the action of another, somewhat longer period planet. To substantiate our suggestions, we present the results of N-body simulations that modeled the TTVs and that checked the stability of the Kepler-210 system.

arXiv comment8 pages, 8 Encapsulated Postscript figures

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• Atmospheric mass loss of extrasolar planets orbiting magnetically active host stars
• Glimpses of stellar surfaces. I. Spot evolution and differential rotation of the planet host star Kepler-210
• Non-Sinusoidal Transit Timing Variations for the Exoplanet HAT-P-12b
• The connection between starspots and superflares: a case study of two stars
• A highly mutually-inclined, compact warm-Jupiter system KOI-984 ?
• Searching for Possible Exoplanet Transits from BRITE Data through a Machine Learning Technique