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

Daniel Huber*, Michael J. Ireland, Timothy R. Bedding, Steve B. Howell, Vicente Maestro, Antoine Ḿerand, Peter G. Tuthill, Timothy R. White, Christopher D. Farrington, P. J. Goldfinger, Harold A. McAlister, Gail H. Schaefer, Judit Sturmann, Laszlo Sturmann, Theo A. ten Brummelaar, Nils H. Turner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)L16-L20
JournalMonthly Notices of the Royal Astronomical Society: Letters
Issue number1
Publication statusPublished - Jun 2012
Externally publishedYes


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