The Rossiter-McLaughlin Effect of the Transiting Exoplanet XO-4b
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 $P$ $=$ 4.1250828$\ \pm\ $0.0000040 d and $T_{\rm c}$ [BJD$...
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| Language: | en_US |
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Astronomical Society of Japan
2012
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| Online Access: | http://hdl.handle.net/1721.1/73119 https://orcid.org/0000-0002-4265-047X |
| _version_ | 1826209051845853184 |
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| author | Narita, Norio Hirano, Teruyuki Sanchis Ojeda, Roberto Winn, Joshua Nathan Holman, Matthew J. Sato, Bunei Aoki, Wako Tamura, Motohide |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Narita, Norio Hirano, Teruyuki Sanchis Ojeda, Roberto Winn, Joshua Nathan Holman, Matthew J. Sato, Bunei Aoki, Wako Tamura, Motohide |
| author_sort | Narita, Norio |
| collection | MIT |
| description | 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 $P$ $=$ 4.1250828$\ \pm\ $0.0000040 d and $T_{\rm c}$ [BJD$_{\rm TDB}$] $=$ 2454485.93323$\ \pm\ $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 $\lambda$ $=$ $-$46$^\circ\!\!\!.$7 $\ ^{{+8^\circ\!\!\!.1}}_{{\ -6^\circ\!\!\!.1}}$. This measurement of $\lambda$ is less robust than in some other cases because the impact parameter of the transit is small, causing a strong degeneracy between $\lambda$ 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. |
| first_indexed | 2024-09-23T14:16:54Z |
| format | Article |
| id | mit-1721.1/73119 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T14:16:54Z |
| publishDate | 2012 |
| publisher | Astronomical Society of Japan |
| record_format | dspace |
| spelling | mit-1721.1/731192022-10-01T20:17:54Z The Rossiter-McLaughlin Effect of the Transiting Exoplanet XO-4b Narita, Norio Hirano, Teruyuki Sanchis Ojeda, Roberto Winn, Joshua Nathan Holman, Matthew J. Sato, Bunei Aoki, Wako Tamura, Motohide Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Winn, Joshua Nathan Winn, Joshua Nathan Sanchis Ojeda, Roberto Hirano, Teruyuki 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 $P$ $=$ 4.1250828$\ \pm\ $0.0000040 d and $T_{\rm c}$ [BJD$_{\rm TDB}$] $=$ 2454485.93323$\ \pm\ $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 $\lambda$ $=$ $-$46$^\circ\!\!\!.$7 $\ ^{{+8^\circ\!\!\!.1}}_{{\ -6^\circ\!\!\!.1}}$. This measurement of $\lambda$ is less robust than in some other cases because the impact parameter of the transit is small, causing a strong degeneracy between $\lambda$ 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. Japan Society for the Promotion of Science (Fellowship for Research DC1: 22-5935) Japan Society for the Promotion of Science (Fellowship for Research PD: 20-8141) United States. National Aeronautics and Space Administration (Origins program grant NNX09AD36G) United States. National Aeronautics and Space Administration (Origins program grant NNX09AB33G) 2012-09-24T15:25:55Z 2012-09-24T15:25:55Z 2010-12 2010-08 Article http://purl.org/eprint/type/JournalArticle 0004-6264 http://hdl.handle.net/1721.1/73119 Narita, Norio. et al. "The Rossiter-McLaughlin Effect of the Transiting Exoplanet XO-4b." Publ. Astron. Soc. Japan 62, L61–L65, 2010 December 25 (c) 2010. Astronomical Society of Japan https://orcid.org/0000-0002-4265-047X en_US http://pasj.asj.or.jp/v62/v62n6.html Publications of the Astronomical Society of Japan Creative Commons Attribution-Noncommercial-Share Alike 3.0 http://creativecommons.org/licenses/by-nc-sa/3.0/ application/pdf Astronomical Society of Japan Prof. Winn via Mat Willmott |
| spellingShingle | Narita, Norio Hirano, Teruyuki Sanchis Ojeda, Roberto Winn, Joshua Nathan Holman, Matthew J. Sato, Bunei Aoki, Wako Tamura, Motohide The Rossiter-McLaughlin Effect of the Transiting Exoplanet XO-4b |
| title | The Rossiter-McLaughlin Effect of the Transiting Exoplanet XO-4b |
| title_full | The Rossiter-McLaughlin Effect of the Transiting Exoplanet XO-4b |
| title_fullStr | The Rossiter-McLaughlin Effect of the Transiting Exoplanet XO-4b |
| title_full_unstemmed | The Rossiter-McLaughlin Effect of the Transiting Exoplanet XO-4b |
| title_short | The Rossiter-McLaughlin Effect of the Transiting Exoplanet XO-4b |
| title_sort | rossiter mclaughlin effect of the transiting exoplanet xo 4b |
| url | http://hdl.handle.net/1721.1/73119 https://orcid.org/0000-0002-4265-047X |
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