Bibcode
Gandolfi, D.; Collier Cameron, A.; Endl, M.; Lanza, A. F.; Damiani, C.; Alonso, R.; Cochran, W. D.; Deleuil, M.; Fridlund, M.; Hatzes, A. P.; Guenther, E. W.
Bibliographical reference
Astronomy and Astrophysics, Volume 543, id.L5
Advertised on:
7
2012
Journal
Citations
36
Refereed citations
31
Description
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
λ = 0.1° ± 2.6°, 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° on the zero-age main
sequence, for an expected average modified tidal quality factor of the
star ⟨ Q '* ' ⟩ ≳ 4 × 106.
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 M&sun;),
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
M&sun;) seem to be preferentially orbited by hot Jupiters
with high obliquity.
Related projects
Helio and Astero-Seismology and Exoplanets Search
The principal objectives of this project are: 1) to study the structure and dynamics of the solar interior, 2) to extend this study to other stars, 3) to search for extrasolar planets using photometric methods (primarily by transits of their host stars) and their characterization (using radial velocity information) and 4) the study of the planetary
Savita
Mathur