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.

To appear in AJ

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• Exoplanetary atmospheric sodium revealed by the orbital motion. Narrow-band transmission spectroscopy of HD 189733b with UVES
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• High-energy irradiation and mass loss rates of hot Jupiters in the solar neighborhood
• An HST/STIS Optical Transmission Spectrum of Warm Neptune GJ 436b
• Evidence for disequilibrium chemistry from vertical mixing in hot Jupiter atmospheres. A comprehensive survey of transiting close-in gas giant exoplanets with warm-Spitzer/IRAC
• Classical and relativistic node precessional effects in WASP-33b and perspectives for detecting them
• Planetary systems around close binary stars: the case of the very dusty, Sun-like, spectroscopic binary BD+20 307
• Early science with SPIRou: near-infrared radial velocity and spectropolarimetry of the planet-hosting star HD 189733
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• Time-resolved UVES observations of a stellar flare on the planet host HD 189733 during primary transit
• Brown dwarfs as ideal candidates for detecting UV aurora outside the Solar System: Hubble Space Telescope observations of 2MASS J1237+6526
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• Super stellar abundances of alkali metals suggest significant migration for Hot Jupiters
• Polarization of hot Jupiter systems: a likely detection of stellar activity and a possible detection of planetary polarization
• The widest broadband transmission spectrum (0.38-1.71 $\mu$m) of HD 189733b from ground-based chromatic Rossiter-McLaughlin observations
• An ESPRESSO view of HD 189733 system. Broadband transmission spectrum, differential rotation, and system architecture
• ROME (Radio Observations of Magnetized Exoplanets). II. HD 189733 Does Not Accrete Significant Material from its Exoplanet like a T Tauri Star from A Disk
• Computation of the transmitted and polarized scattered fluxes by the exoplanet HD 189733b in X-rays
• A differential Least Squares Deconvolution method for high precision spectroscopy of stars and exoplanets I. Application to obliquity measurements of HARPS observations of HD189733b
• Precise Photometry and Spectroscopy of Transits
• Hot Jupiters accreting onto their parent stars: effects on the stellar activity
• Tidal star-planet interaction and its observed impact on stellar activity in planet-hosting wide binary systems