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Hot Stars With Hot Jupiters Have High Obliquities

Author(s)
Winn, Joshua Nathan; Fabrycky, Daniel C.; Albrecht, Simon H.; Johnson, John Asher
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Abstract
We show that stars with transiting planets for which the stellar obliquity is large are preferentially hot (T [subscript eff] > 6250 K). This could explain why small obliquities were observed in the earliest measurements, which focused on relatively cool stars drawn from Doppler surveys, as opposed to hotter stars that emerged more recently from transit surveys. The observed trend could be due to differences in planet formation and migration around stars of varying mass. Alternatively, we speculate that hot-Jupiter systems begin with a wide range of obliquities, but the photospheres of cool stars realign with the orbits due to tidal dissipation in their convective zones, while hot stars cannot realign because of their thinner convective zones. This in turn would suggest that hot Jupiters originate from few-body gravitational dynamics and that disk migration plays at most a supporting role.
Date issued
2010-07
URI
http://hdl.handle.net/1721.1/61999
Department
Massachusetts Institute of Technology. Department of Physics; MIT Kavli Institute for Astrophysics and Space Research
Journal
Astrophysical Journal. Letters
Publisher
American Physical Society
Citation
Winn, Joshua N. et al. "Hot stars with hot Jupiters have high obliquities." Astrophysical Journal: Letters, 718.2, p.L145–L149, 2010 August 1
Version: Author's final manuscript
ISSN
2041-8205
2041-8213

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