Spin-Orbit Alignment of the TrES-4 Transiting Planetary System and Possible Additional Radial-Velocity Variation
We report new radial velocities of the TrES-4 transiting planetary system, including observations of a full transit, with the High Dispersion Spectrograph of the Subaru 8.2m telescope. Modeling of the Rossiter-McLaughlin effect indicates that TrES-4b has closely aligned orbital and stellar spin ax...
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| 语言: | en_US |
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Astronomical Society of Japan
2011
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| 在线阅读: | http://hdl.handle.net/1721.1/61996 https://orcid.org/0000-0002-4265-047X |
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| author | Narita, Norio Sato, Bunei Hirano, Teruyuki Winn, Joshua Nathan Aoki, Wako Tamura, Motohide |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Narita, Norio Sato, Bunei Hirano, Teruyuki Winn, Joshua Nathan Aoki, Wako Tamura, Motohide |
| author_sort | Narita, Norio |
| collection | MIT |
| description | We report new radial velocities of the TrES-4 transiting planetary system, including observations of
a full transit, with the High Dispersion Spectrograph of the Subaru 8.2m telescope. Modeling of the
Rossiter-McLaughlin effect indicates that TrES-4b has closely aligned orbital and stellar spin axes, with [lambda]=6.3[degrees]±4.7[degrees]. The close spin-orbit alignment angle of TrES-4b seems to argue against a migration history
involving planet-planet scattering or Kozai cycles, although there are two nearby faint stars that could be binary companion candidates. Comparison of our out-of-transit data from 4 different runs suggest that the star exhibits radial velocity variability of 20 m s[superscript −1] in excess of a single Keplerian orbit. Although the cause of the excess radial velocity variability is unknown, we discuss various possibilities including systematic measurement errors, starspots or other intrinsic motions, and additional companions besides the transiting planet. |
| first_indexed | 2024-09-23T16:01:16Z |
| format | Article |
| id | mit-1721.1/61996 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:01:16Z |
| publishDate | 2011 |
| publisher | Astronomical Society of Japan |
| record_format | dspace |
| spelling | mit-1721.1/619962022-10-02T05:43:39Z Spin-Orbit Alignment of the TrES-4 Transiting Planetary System and Possible Additional Radial-Velocity Variation Narita, Norio Sato, Bunei Hirano, Teruyuki Winn, Joshua Nathan 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 We report new radial velocities of the TrES-4 transiting planetary system, including observations of a full transit, with the High Dispersion Spectrograph of the Subaru 8.2m telescope. Modeling of the Rossiter-McLaughlin effect indicates that TrES-4b has closely aligned orbital and stellar spin axes, with [lambda]=6.3[degrees]±4.7[degrees]. The close spin-orbit alignment angle of TrES-4b seems to argue against a migration history involving planet-planet scattering or Kozai cycles, although there are two nearby faint stars that could be binary companion candidates. Comparison of our out-of-transit data from 4 different runs suggest that the star exhibits radial velocity variability of 20 m s[superscript −1] in excess of a single Keplerian orbit. Although the cause of the excess radial velocity variability is unknown, we discuss various possibilities including systematic measurement errors, starspots or other intrinsic motions, and additional companions besides the transiting planet. National Science Foundation (U.S.) (Grant No. NSF PHY05-51164) Japan Society for the Promotion of Science ((JSPS) Fellowship for Research (PD: 20-8141)) 2011-03-30T15:55:41Z 2011-03-30T15:55:41Z 2010-06 2010-02 Article http://purl.org/eprint/type/JournalArticle 0004-6264 http://hdl.handle.net/1721.1/61996 Narita, Norio, et al. "Spin-Orbit Alignment of the Tres-4 Transiting Planetary System and Possible Additional Radial-Velocity Variation." Publications of the Astronomical Society of Japan 62 3 (2010): 653-60. https://orcid.org/0000-0002-4265-047X en_US http://pasj.asj.or.jp/v62/n3/620311/620311a.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 Sato, Bunei Hirano, Teruyuki Winn, Joshua Nathan Aoki, Wako Tamura, Motohide Spin-Orbit Alignment of the TrES-4 Transiting Planetary System and Possible Additional Radial-Velocity Variation |
| title | Spin-Orbit Alignment of the TrES-4 Transiting Planetary System and Possible Additional Radial-Velocity Variation |
| title_full | Spin-Orbit Alignment of the TrES-4 Transiting Planetary System and Possible Additional Radial-Velocity Variation |
| title_fullStr | Spin-Orbit Alignment of the TrES-4 Transiting Planetary System and Possible Additional Radial-Velocity Variation |
| title_full_unstemmed | Spin-Orbit Alignment of the TrES-4 Transiting Planetary System and Possible Additional Radial-Velocity Variation |
| title_short | Spin-Orbit Alignment of the TrES-4 Transiting Planetary System and Possible Additional Radial-Velocity Variation |
| title_sort | spin orbit alignment of the tres 4 transiting planetary system and possible additional radial velocity variation |
| url | http://hdl.handle.net/1721.1/61996 https://orcid.org/0000-0002-4265-047X |
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