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arXiv · 0712.2569

A Possible Spin-Orbit Misalignment in the Transiting Eccentric Planet HD 17156b

Norio Narita·Bun'ei Sato·Osamu Ohshima·Joshua N. Winn
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Abstract

We present simultaneous photometric and spectroscopic observations of HD 17156b spanning a transit on UT 2007 November 12. This system is of special interest because of its 21-day period (unusually long for a transiting planet) and its high orbital eccentricity of 0.67. By modeling the Rossiter-McLaughlin effect, we find the angle between the sky projections of the orbital axis and the stellar rotation axis to be $62^{\circ} \pm 25^{\circ}$. Such a large spin-orbit misalignment, as well as the large eccentricity, could be explained as the relic of a previous gravitational interaction with other planets.

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Norio Narita, Bun'ei Sato, Osamu Ohshima, Joshua N. Winn. 2008-02-01. A Possible Spin-Orbit Misalignment in the Transiting Eccentric Planet HD 17156b. https://doi.org/10.1093/pasj%2F60.2.l1

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