The Rotation Period of the Planet-Hosting Star HD 189733

Abstract

We present synoptic optical photometry of HD 189733, the chromospherically active parent star of one of the most intensively studied exoplanets. We have significantly extended the timespan of our previously reported observations and refined the estimate of the stellar rotation period by more than an order of magnitude: $P=11.953\pm 0.009$ days. We derive a lower limit on the inclination of the stellar rotation axis of $56\arcdeg$ (with 95% confidence), corroborating earlier evidence that the stellar spin axis and planetary orbital axis are well aligned.

arXiv commentTo appear in AJ

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Cited by in corpus (73)

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• Homogeneous studies of transiting extrasolar planets. I. Light curve analyses
• Evaporation of the planet HD189733b observed in HI Lyman-alpha
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• Exoplanetary Spin-Orbit Alignment: Results from the Ensemble of Rossiter-McLaughlin Observations
• SOAP 2.0: A tool to estimate the photometric and radial velocity variations induced by stellar spots and plages
• Multi-Wavelength Constraints on the Day-Night Circulation Patterns of HD 189733b
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• A Rocky Composition for an Earth-sized Exoplanet
• Line-profile tomography of exoplanet transits I: The Doppler shadow of HD 189733b
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• The 8 Micron Phase Variation of the Hot Saturn HD 149026b
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• First Evidence of a Retrograde Orbit of Transiting Exoplanet HAT-P-7b
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• A Spitzer Transmission Spectrum for the Exoplanet GJ 436b, Evidence for Stellar Variability, and Constraints on Dayside Flux Variations
• On the Inference of a Star's Inclination Angle from its Rotation Velocity and Projected Rotation Velocity
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• An HST/STIS Optical Transmission Spectrum of Warm Neptune GJ 436b
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• LUNA: An algorithm for generating dynamic planet-moon transits
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• Planetary systems around close binary stars: the case of the very dusty, Sun-like, spectroscopic binary BD+20 307
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