NDLI: MEASUREMENTS OF STELLAR INCLINATIONS FORKEPLERPLANET CANDIDATES. II. CANDIDATE SPIN-ORBIT MISALIGNMENTS IN SINGLE- AND MULTIPLE-TRANSITING SYSTEMS

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MEASUREMENTS OF STELLAR INCLINATIONS FORKEPLERPLANET CANDIDATES. II. CANDIDATE SPIN-ORBIT MISALIGNMENTS IN SINGLE- AND MULTIPLE-TRANSITING SYSTEMS

Content Provider	Scilit
Author	Hirano, Teruyuki Sanchis-Ojeda, Roberto Takeda, Yoichi Winn, Joshua N. Narita, Norio Takahashi, Yasuhiro H.
Copyright Year	2014
Description	Journal: The Astrophysical Journal 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.
Related Links	http://iopscience.iop.org/article/10.1088/0004-637X/783/1/9/pdf
ISSN	0004637X
DOI	10.1088/0004-637x/783/1/9
Journal	The Astrophysical Journal
Issue Number	1
Volume Number	783
Language	English
Publisher	IOP Publishing
Publisher Date	2014-02-06
Access Restriction	Open
Subject Keyword	Journal: The Astrophysical Journal Astronomy and Astrophysics
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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