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Article Dans Une Revue Earth, Moon, and Planets Année : 2009

CoRoT-2a Magnetic Activity: Hints for Possible Star-Planet Interaction

Résumé

CoRoT-2a is a young (≈0.5 Gyr) G7V star accompanied by a transiting hot-Jupiter, discovered by the CoRoT satellite (Alonso et al. Astron Astrophys 482:L21, 2008; Bouchy et al. Astron Astrophys 482:L25, 2008). An analysis of its photospheric activity, based on spot modelling techniques previously developed by our group for the analysis of the Sun as a star, shows that the active regions on CoRoT-2a arised within two active longitudes separated by about 180° and rotating with periods of 4.5221 and 4.5543 days, respectively, at epoch of CoRoT observations (112 continous days centered at ≈2007.6). We show that the total spotted area oscillates with a period of about 28.9 days, a value close to 10 times the synodic period of the planet with respect to the active longitude pattern rotating in 4.5221 days. Moreover, the variance of the stellar flux is modulated in phase with the planet orbital period. This suggests a possible star-planet magnetic interaction, a phenomenon already seen in other extrasolar planetary systems hosting hot-Jupiters.

Dates et versions

hal-03785748 , version 1 (23-09-2022)

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Isabella Pagano, Antonino F. Lanza, Giuseppe Leto, Sergio Messina, Pierre Barge, et al.. CoRoT-2a Magnetic Activity: Hints for Possible Star-Planet Interaction. Earth, Moon, and Planets, 2009, 105, pp.373-378. ⟨10.1007/s11038-009-9301-3⟩. ⟨hal-03785748⟩
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