Accurate Stellar Parameters of Low-Mass Kepler Planet Hosts

Details Accurate Stellar Parameters of Low-Mass Kepler Planet Hosts Accurate Stellar Parameters of Low-Mass Kepler Planet Hosts

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21933004m&link_type=abstract

American Astronomical Society, AAS Meeting #219, #330.04

Astronomy and Astrophysics

Astronomy

Scientific paper

We report stellar parameters for low-mass planet-candidate host stars recently announced by the Kepler Mission. We obtained medium-resolution, K-band spectra of 84 low-mass Kepler Objects of Interest (KOIs). We identified one KOI as a giant; for the remaining dwarfs, we estimated effective temperatures by comparing measurements of K-band regions dominated by H2O opacity with predictions of synthetic spectra for low-mass stars. We measured overall metallicities ([M/H]) using the equivalent widths of Na I and Ca I absorption features and an empirical metallicity relation calibrated with nearby stars. With effective temperatures and metallicities, we estimate the masses and radii of the low-mass KOIs by interpolation onto two sets of evolutionary isochrones. The resultant stellar radii are significantly less than the values reported in the Kepler Input Catalogue and, by construction, correlate better with effective temperature. Using either set of isochrones, our results significantly reduce the sizes of the corresponding planet candidates, with many less than 1 Earth radius. We report recalculated equilibrium temperatures for the planet-candidates and the implications for Kepler's yield of terrestrial exoplanets in the habitable zones of their host stars.

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