MEASUREMENTS OF STELLAR INCLINATIONS FOR KEPLER PLANET CANDIDATES. II. CANDIDATE SPIN-ORBIT MISALIGNMENTS IN SINGLE- AND MULTIPLE-TRANSITING SYSTEMS
We present a test for spin-orbit alignment for the host stars of 25 candidate planetary systems detected by the Kepler spacecraft. The inclination angle of each star's rotation axis was estimated from its rotation period, rotational line broadening, and radius. The rotation periods were determi...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | en_US |
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IOP Publishing
2014
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| Online Access: | http://hdl.handle.net/1721.1/88677 https://orcid.org/0000-0002-4265-047X |
| _version_ | 1826205734400950272 |
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| author | Hirano, Teruyuki Takeda, Yoichi Narita, Norio Takahashi, Yasuhiro H. Sanchis Ojeda, Roberto Winn, Joshua Nathan |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Hirano, Teruyuki Takeda, Yoichi Narita, Norio Takahashi, Yasuhiro H. Sanchis Ojeda, Roberto Winn, Joshua Nathan |
| author_sort | Hirano, Teruyuki |
| collection | MIT |
| description | We present a test for spin-orbit alignment for the host stars of 25 candidate planetary systems detected by the Kepler spacecraft. The inclination angle of each star's rotation axis was estimated from its rotation period, rotational line broadening, and radius. The rotation periods were determined using the Kepler photometric time series. The rotational line broadening was determined from high-resolution optical spectra with the Subaru High Dispersion Spectrograph. Those same spectra were used to determine the star's photospheric parameters (effective temperature, surface gravity, metallicity), which were then interpreted with stellar-evolutionary models to determine stellar radii. We combine the new sample with the seven stars from our previous work on this subject, finding that the stars show a statistical tendency to have inclinations near 90°, in alignment with the planetary orbits. Possible spin-orbit misalignments are seen in several systems, including three multiple-planet systems (KOI-304, 988, 2261). Ideally, these systems should be scrutinized with complementary techniques, such as the Rossiter-McLaughlin effect, starspot-crossing anomalies, or asteroseismology, but the measurements will be difficult owing to the relatively faint apparent magnitudes and small transit signals in these systems. |
| first_indexed | 2024-09-23T13:17:45Z |
| format | Article |
| id | mit-1721.1/88677 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:17:45Z |
| publishDate | 2014 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/886772022-10-01T14:21:30Z MEASUREMENTS OF STELLAR INCLINATIONS FOR KEPLER PLANET CANDIDATES. II. CANDIDATE SPIN-ORBIT MISALIGNMENTS IN SINGLE- AND MULTIPLE-TRANSITING SYSTEMS Hirano, Teruyuki Takeda, Yoichi Narita, Norio Takahashi, Yasuhiro H. Sanchis Ojeda, Roberto Winn, Joshua Nathan Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Sanchis Ojeda, Roberto Winn, Joshua Nathan We present a test for spin-orbit alignment for the host stars of 25 candidate planetary systems detected by the Kepler spacecraft. The inclination angle of each star's rotation axis was estimated from its rotation period, rotational line broadening, and radius. The rotation periods were determined using the Kepler photometric time series. The rotational line broadening was determined from high-resolution optical spectra with the Subaru High Dispersion Spectrograph. Those same spectra were used to determine the star's photospheric parameters (effective temperature, surface gravity, metallicity), which were then interpreted with stellar-evolutionary models to determine stellar radii. We combine the new sample with the seven stars from our previous work on this subject, finding that the stars show a statistical tendency to have inclinations near 90°, in alignment with the planetary orbits. Possible spin-orbit misalignments are seen in several systems, including three multiple-planet systems (KOI-304, 988, 2261). Ideally, these systems should be scrutinized with complementary techniques, such as the Rossiter-McLaughlin effect, starspot-crossing anomalies, or asteroseismology, but the measurements will be difficult owing to the relatively faint apparent magnitudes and small transit signals in these systems. United States. National Aeronautics and Space Administration (Origins program NNX11AG85G) Kepler Participating Scientist Program (NNX12AC76G) 2014-08-11T18:20:11Z 2014-08-11T18:20:11Z 2014-02 2013-11 Article http://purl.org/eprint/type/JournalArticle 0004-637X 1538-4357 http://hdl.handle.net/1721.1/88677 Hirano, Teruyuki, Roberto Sanchis-Ojeda, Yoichi Takeda, Joshua N. Winn, Norio Narita, and Yasuhiro H. Takahashi. “ MEASUREMENTS OF STELLAR INCLINATIONS FOR KEPLER PLANET CANDIDATES. II. CANDIDATE SPIN-ORBIT MISALIGNMENTS IN SINGLE- AND MULTIPLE-TRANSITING SYSTEMS .” The Astrophysical Journal 783, no. 1 (March 1, 2014): 9. https://orcid.org/0000-0002-4265-047X en_US http://dx.doi.org/10.1088/0004-637X/783/1/9 The Astrophysical Journal Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf IOP Publishing arXiv |
| spellingShingle | Hirano, Teruyuki Takeda, Yoichi Narita, Norio Takahashi, Yasuhiro H. Sanchis Ojeda, Roberto Winn, Joshua Nathan MEASUREMENTS OF STELLAR INCLINATIONS FOR KEPLER PLANET CANDIDATES. II. CANDIDATE SPIN-ORBIT MISALIGNMENTS IN SINGLE- AND MULTIPLE-TRANSITING SYSTEMS |
| title | MEASUREMENTS OF STELLAR INCLINATIONS FOR KEPLER PLANET CANDIDATES. II. CANDIDATE SPIN-ORBIT MISALIGNMENTS IN SINGLE- AND MULTIPLE-TRANSITING SYSTEMS |
| title_full | MEASUREMENTS OF STELLAR INCLINATIONS FOR KEPLER PLANET CANDIDATES. II. CANDIDATE SPIN-ORBIT MISALIGNMENTS IN SINGLE- AND MULTIPLE-TRANSITING SYSTEMS |
| title_fullStr | MEASUREMENTS OF STELLAR INCLINATIONS FOR KEPLER PLANET CANDIDATES. II. CANDIDATE SPIN-ORBIT MISALIGNMENTS IN SINGLE- AND MULTIPLE-TRANSITING SYSTEMS |
| title_full_unstemmed | MEASUREMENTS OF STELLAR INCLINATIONS FOR KEPLER PLANET CANDIDATES. II. CANDIDATE SPIN-ORBIT MISALIGNMENTS IN SINGLE- AND MULTIPLE-TRANSITING SYSTEMS |
| title_short | MEASUREMENTS OF STELLAR INCLINATIONS FOR KEPLER PLANET CANDIDATES. II. CANDIDATE SPIN-ORBIT MISALIGNMENTS IN SINGLE- AND MULTIPLE-TRANSITING SYSTEMS |
| title_sort | measurements of stellar inclinations for kepler planet candidates ii candidate spin orbit misalignments in single and multiple transiting systems |
| url | http://hdl.handle.net/1721.1/88677 https://orcid.org/0000-0002-4265-047X |
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