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arXiv · 1111.5016

A High Stellar Obliquity in the WASP-7 Exoplanetary System

Simon Albrecht·Joshua N. Winn·R. Paul Butler·Jeffrey D. Crane·Stephen A Shectman·Ian B. Thompson·Teruyuki Hirano·Robert A. Wittenmyer
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Abstract

We measure a tilt of 86+-6 deg between the sky projections of the rotation axis of the WASP-7 star, and the orbital axis of its close-in giant planet. This measurement is based on observations of the Rossiter-McLaughlin (RM) effect with the Planet Finder Spectrograph on the Magellan II telescope. The result conforms with the previously noted pattern among hot-Jupiter hosts, namely, that the hosts lacking thick convective envelopes have high obliquities. Because the planet's trajectory crosses a wide range of stellar latitudes, observations of the RM effect can in principle reveal the stellar differential rotation profile; however, with the present data the signal of differential rotation could not be detected. The host star is found to exhibit radial-velocity noise (``stellar jitter') with an amplitude of ~30m/s over a timescale of days.

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Simon Albrecht, Joshua N. Winn, R. Paul Butler, Jeffrey D. Crane, Stephen A Shectman, Ian B. Thompson, Teruyuki Hirano, Robert A. Wittenmyer. 2011-11-21. A High Stellar Obliquity in the WASP-7 Exoplanetary System. https://doi.org/10.1088/0004-637x%2F744%2F2%2F189

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