Journal Article

The Rossiter–McLaughlin Effect of the Transiting Exoplanet XO-4b

Norio Narita, Teruyuki Hirano, Roberto Sanchis-Ojeda, Joshua N. Winn, Matthew J. Holman, Bun’ei Sato, Wako Aoki and Motohide Tamura

in Publications of the Astronomical Society of Japan

Volume 62, issue 6, pages L61-L65
Published in print December 2010 | ISSN: 0004-6264
Published online December 2010 | e-ISSN: 2053-051X | DOI: http://dx.doi.org/10.1093/pasj/62.6.L61
The Rossiter–McLaughlin Effect of the Transiting Exoplanet XO-4b

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  • Astronomical Instrumentation, Methods, and Techniques
  • Planetary Systems
  • Stars

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We report photometric and radial velocity observations of the XO-4 transiting planetary system, conducted with the FLWO 1.2 m telescope and the 8.2 m Subaru Telescope. Based on the new light curves, the refined transit ephemeris of XO-4b is [math] [math] 4.1250828[math]0.0000040 d and [math] [BJD[math]] [math] 2454485.93323[math]0.00039. We measured the Rossiter–McLaughlin effect of XO-4b and estimated the sky-projected angle between the stellar spin axis and the planetary orbital axis to be [math] [math] [math]46[math]7[math]. This measurement of [math] is less robust than in some other cases because the impact parameter of the transit is small, causing a strong degeneracy between [math] and the projected stellar rotational velocity. Nevertheless, our finding of a spin–orbit misalignment suggests that the migration process for XO-4b involved few-body dynamics rather than interaction with a gaseous disk. In addition, our result conforms with the pattern reported by Winn et al. (2010, ApJ, 718, L145) that high obliquities are preferentially found for stars with effective temperatures hotter than 6250 K.

Keywords: planets and satellites: individual (XO-4); stars: rotation; techniques: photometric; techniques: radial velocities; techniques: spectroscopic

Journal Article.  4019 words.  Illustrated.

Subjects: Astronomical Instrumentation, Methods, and Techniques ; Planetary Systems ; Stars

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