The Oldest Known Rocky-exoplanet Hosting System: Kepler-10 Revisited

Since the discovery of Kepler-10, the system has received considerable interest because it contains a small, rocky planet which orbits the star in less than a day. 

The system’s parameters, announced by the Kepler team and subsequently used in further research, were based on only 5 months of data. We have reanalyzed this system using the full span of 29 months of Kepler photometric data, and obtained improved information about its star and the planets. A detailed asteroseismic analysis of the extended time series provides a significant improvement on the stellar parameters: Not only can we state that Kepler-10 is the oldest known rocky-planet-harboring system at 10.41 +/- 1.36 Gyr, but these parameters combined with improved planetary parameters from new transit fits gives us the radius of Kepler-10b to within just 125 km. 

A new analysis of the full planetary phase curve leads to new estimates on the planetary temperature and albedo, which remain degenerate in the Kepler band. Our modeling suggests that the flux level during the occultation is slightly lower than at the transit wings, which would imply that the nightside of this planet has a non-negligible temperature.

Accurate parameters of the Oldest Known Rocky-exoplanet Hosting System: Kepler-10 Revisited

Alexandra Fogtmann-Schulz, Brian Hinrup, Vincent Van Eylen, Jorgen Christensen-Dalsgaard, Hans Kjeldsen, Victor Silva Aguirre, Brandon Tingley (Submitted on 25 Nov 2013)

Comments: 14 pages (in the used format), 4 figures. Submitted to The Astrophysical Journal at the 22nd of November 2013

Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Solar and Stellar Astrophysics (astro-ph.SR)

Cite as: arXiv:1311.6336 [astro-ph.EP] (or arXiv:1311.6336v1 [astro-ph.EP] for this version) 

Submission history From: Alexandra Fogtmann-Schulz [v1] Mon, 25 Nov 2013 15:30:55 GMT (109kb)