Validation of the exoplanet Kepler-21b using PAVO/CHARA long-baseline interferometry

Huber, D; Ireland, Michael; Bedding, Timothy Russell; Howell, Steve B; Maestro, V; Merand, A; Tuthill, Peter G; White, T. R; Farrington, C; Goldfinger, P. J; McAlister, H; Schaefer, G. H; Sturmann, J; Sturmann, Laszlo; ten Brummelaar, Theo; Turner, Nils

Validation of the exoplanet Kepler-21b using PAVO/CHARA long-baseline interferometry

Date

2012

Authors

Huber, D

Ireland, Michael

Bedding, Timothy Russell

Howell, Steve B

Maestro, V

Merand, A

Tuthill, Peter G

White, T. R

Farrington, C

Goldfinger, P. J

Publisher

Blackwell Publishing

Abstract

We present long-baseline interferometry of the Kepler exoplanet host star HD179070 (Kepler-21) using the Precision Astronomical Visible Observations (PAVO) beam combiner at the Center for High Angular Resolution Astronomy (CHARA) Array. The visibility data are consistent with a single star and exclude stellar companions at separations ~1-1000 mas (~0.1-113 au) and contrasts <3.5 mag. This result supports the validation of the 1.6R⊕ exoplanet Kepler-21b by Howell et al. and complements the constraints set by adaptive optics imaging, speckle interferometry and radial-velocity observations to rule out false positives due to stellar companions. We conclude that long-baseline interferometry has strong potential to validate transiting extrasolar planets, particularly for future projects aimed at brighter stars and for host stars where radial-velocity follow-up is not available.