Volume 564, April 2014
|Number of page(s)||8|
|Section||Planets and planetary systems|
|Published online||01 April 2014|
Kepler-210: An active star with at least two planets⋆
1 Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
2 Centre for Astrophysics and Planetary Science, School of Physical Sciences (SEPnet), The University of Kent, Canterbury, CT2 7NH, UK
3 Dept. of Astronomy, Box 351580, University of Washington, Seattle WA 98195, USA
Received: 6 September 2013
Accepted: 31 January 2014
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.
Key words: planetary systems / methods: data analysis / stars: individual: Kepler 210
Tables 5–8 are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (220.127.116.11) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/564/A33
© ESO, 2014
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