Astrophysics> Earth and Planetary Astrophysics
arXiv:1206.4037 (astro-ph)
[Submitted on 18 Jun 2012 (v1), last revised 19 Jun 2012 (this version, v2)]
Title:Doppler tomography of transiting exoplanets: A prograde, low-inclined orbit for the hot Jupiter CoRoT-11b
Authors:Davide Gandolfi, Andrew Collier Cameron, Michael Endl, Antonino F. Lanza, Cilia Damiani, Roi Alonso, William D. Cochran, Magali Deleuil, Malcolm Fridlund, Artie P. Hatzes, Eike W. Guenther
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Abstract:We report the detection of the Doppler shadow of the transiting hot Jupiter CoRoT-11b. Our analysis is based on line-profile tomography of time-series, Keck/HIRES high-resolution spectra acquired during the transit of the planet. We measured a sky-projected, spin-orbit angle of 0.1 +/- 2.6 degrees, which is consistent with a very low-inclined orbit with respect to the stellar rotation axis. We refined the physical parameters of the system using a Markov chain Monte Carlo simultaneous fitting of the available photometric and spectroscopic data. An analysis of the tidal evolution of the system shows how the currently measured obliquity and its uncertainty translate into an initial absolute value of less than about 10 degrees on the zero-age main sequence, for an expected average modified tidal quality factor of the star Q'* > 4 x 10^6. This is indicative of an inward migration scenario that would not have perturbed the primordial low obliquity of CoRoT-11b. Taking into account the effective temperature and mass of the planet host star (Teff=6440 K, M*=1.23 MSun), the system can be considered a new telling exception to the recently proposed trend, according to which relatively hot and massive stars (Teff>6250 K, M*>1.2 MSun) seem to be preferentially orbited by hot Jupiters with high obliquity.
| Comments: | 5 pages, 4 figures, accepted for publication in A&A Letters |
| Subjects: | Earth and Planetary Astrophysics (astro-ph.EP); Solar and Stellar Astrophysics (astro-ph.SR) |
| Cite as: | arXiv:1206.4037 [astro-ph.EP] |
| (or arXiv:1206.4037v2 [astro-ph.EP] for this version) | |
| https://doi.org/10.48550/arXiv.1206.4037
arXiv-issued DOI via DataCite
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| Related DOI: | https://doi.org/10.1051/0004-6361/201219533
DOI(s) linking to related resources
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Submission history
From: Davide Gandolfi [view email][v1] 2012年6月18日 19:51:25 UTC (321 KB)
[v2] 2012年6月19日 13:20:16 UTC (321 KB)
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