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.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 543, id.L5
Fecha de publicación:
7
2012
Revista
Número de citas
36
Número de citas referidas
31
Descripción
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.
Proyectos relacionados
Sismología Solar y Estelar y Búsqueda de Exoplanetas
Los objetivos genéricos de este Proyecto son: 1) el estudio de la estructura y dinámica del interior solar, 2) la extensión de dicho estudio al caso de otras estrellas, 3) la búsqueda y caracterización de planetas extrasolares por métodos fotométricos (principalmente mediante el método de tránsitos) y espectroscópico (variaciones en la velocidad
Savita
Mathur