Photospheric activity and rotation of the planet-hosting star CoRoT-4a

Aims. The space experiment CoRoT has recently detected a transiting hot Jupiter in orbit around a moderately active F-type mainsequence star (CoRoT-4a). This planetary system is of particular interest because it has an orbital period of 9.202 days, the second longest one among the transiting planets...

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Principais autores: Lanza, A. F., Aigrain, S., Messina, S., Leto, G., Pagano, I., Auvergne, M., Baglin, A., Barge, P., Bonomo, A. S., Cameron, A. Collier, Cutispoto, G., Deleuil, M., Medeiros, José Renan de, Foing, B., Moutou, C.
Formato: article
Idioma:English
Publicado em: Astronomy & Astrophysics
Assuntos:
Stars: magnetic fields
Stars: late-type
Stars: activity
Stars: rotation
Planetary systems
Stars: individual: CoRoT-4a
Endereço do item:https://repositorio.ufrn.br/jspui/handle/123456789/28988
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spelling ri-123456789-289882020-05-17T08:00:06Z Photospheric activity and rotation of the planet-hosting star CoRoT-4a Lanza, A. F. Aigrain, S. Messina, S. Leto, G. Pagano, I. Auvergne, M. Baglin, A. Barge, P. Bonomo, A. S. Cameron, A. Collier Cutispoto, G. Deleuil, M. Medeiros, José Renan de Foing, B. Moutou, C. Stars: magnetic fields Stars: late-type Stars: activity Stars: rotation Planetary systems Stars: individual: CoRoT-4a Aims. The space experiment CoRoT has recently detected a transiting hot Jupiter in orbit around a moderately active F-type mainsequence star (CoRoT-4a). This planetary system is of particular interest because it has an orbital period of 9.202 days, the second longest one among the transiting planets known to date. We study the surface rotation and the activity of the host star during an uninterrupted sequence of optical observations of 58 days. Methods. Our approach is based on a maximum entropy spot modelling technique extensively tested by modelling the variation in the total solar irradiance. It has been successfully applied to model the light curve of another active star with a transiting planet observed by CoRoT, i.e., CoRoT-2a. It assumes that stellar active regions consist of cool spots and bright faculae, analogous to sunspots and solar photospheric faculae, whose visibility is modulated by stellar rotation. Results. The modelling of the light curve of CoRoT-4a reveals three main active longitudes with lifetimes between ∼30 and ∼60 days that rotate quasi-synchronously with the orbital motion of the planet. The different rotation rates of the active longitudes are interpreted in terms of surface differential rotation, and a lower limit of 0.057 ± 0.015 is derived for its relative amplitude. The enhancement of activity observed close to the subplanetary longitude suggests a magnetic star-planet interaction, although the short duration of the time series prevents us from drawing definite conclusions. Conclusions. The present work confirms the quasi-synchronicity between stellar rotation and planetary orbital motion in the CoRoT4 system and provides a lower limit for the surface differential rotation of the star. This information can be important in trying to understand the formation and evolution of this highly interesting planetary system. Moreover, there is an indication of a possible star-planet magnetic interaction that needs to be confirmed by future studies. 2020-05-15T14:43:28Z 2020-05-15T14:43:28Z 2009-10 article Medeiros, Jose Renan de et al. Photospheric activity and rotation of the planet-hosting star CoRoT-4a. Astronomy & Astrophysics (Berlin. Print), v. 506, n. 1, p. 255-262, 2009. ISSN 1432-0746 versão online. DOI https://doi.org/10.1051/0004-6361/200811487. Disponível em: https://www.aanda.org/articles/aa/abs/2009/40/aa11487-08/aa11487-08.html. Acesso em: 15 maio 2020. Reproduzido com permissão da Astronomy & Astrophysics, © ESO. 0004-6361 (print); 1432-0746 (online) https://repositorio.ufrn.br/jspui/handle/123456789/28988 10.1051/0004-6361/200811487 en application/pdf Astronomy & Astrophysics
institution Repositório Institucional
collection RI - UFRN
language English
topic Stars: magnetic fields
Stars: late-type
Stars: activity
Stars: rotation
Planetary systems
Stars: individual: CoRoT-4a
spellingShingle Stars: magnetic fields
Stars: late-type
Stars: activity
Stars: rotation
Planetary systems
Stars: individual: CoRoT-4a
Lanza, A. F.
Aigrain, S.
Messina, S.
Leto, G.
Pagano, I.
Auvergne, M.
Baglin, A.
Barge, P.
Bonomo, A. S.
Cameron, A. Collier
Cutispoto, G.
Deleuil, M.
Medeiros, José Renan de
Foing, B.
Moutou, C.
Photospheric activity and rotation of the planet-hosting star CoRoT-4a
description Aims. The space experiment CoRoT has recently detected a transiting hot Jupiter in orbit around a moderately active F-type mainsequence star (CoRoT-4a). This planetary system is of particular interest because it has an orbital period of 9.202 days, the second longest one among the transiting planets known to date. We study the surface rotation and the activity of the host star during an uninterrupted sequence of optical observations of 58 days. Methods. Our approach is based on a maximum entropy spot modelling technique extensively tested by modelling the variation in the total solar irradiance. It has been successfully applied to model the light curve of another active star with a transiting planet observed by CoRoT, i.e., CoRoT-2a. It assumes that stellar active regions consist of cool spots and bright faculae, analogous to sunspots and solar photospheric faculae, whose visibility is modulated by stellar rotation. Results. The modelling of the light curve of CoRoT-4a reveals three main active longitudes with lifetimes between ∼30 and ∼60 days that rotate quasi-synchronously with the orbital motion of the planet. The different rotation rates of the active longitudes are interpreted in terms of surface differential rotation, and a lower limit of 0.057 ± 0.015 is derived for its relative amplitude. The enhancement of activity observed close to the subplanetary longitude suggests a magnetic star-planet interaction, although the short duration of the time series prevents us from drawing definite conclusions. Conclusions. The present work confirms the quasi-synchronicity between stellar rotation and planetary orbital motion in the CoRoT4 system and provides a lower limit for the surface differential rotation of the star. This information can be important in trying to understand the formation and evolution of this highly interesting planetary system. Moreover, there is an indication of a possible star-planet magnetic interaction that needs to be confirmed by future studies.
format article
author Lanza, A. F.
Aigrain, S.
Messina, S.
Leto, G.
Pagano, I.
Auvergne, M.
Baglin, A.
Barge, P.
Bonomo, A. S.
Cameron, A. Collier
Cutispoto, G.
Deleuil, M.
Medeiros, José Renan de
Foing, B.
Moutou, C.
author_facet Lanza, A. F.
Aigrain, S.
Messina, S.
Leto, G.
Pagano, I.
Auvergne, M.
Baglin, A.
Barge, P.
Bonomo, A. S.
Cameron, A. Collier
Cutispoto, G.
Deleuil, M.
Medeiros, José Renan de
Foing, B.
Moutou, C.
author_sort Lanza, A. F.
title Photospheric activity and rotation of the planet-hosting star CoRoT-4a
title_short Photospheric activity and rotation of the planet-hosting star CoRoT-4a
title_full Photospheric activity and rotation of the planet-hosting star CoRoT-4a
title_fullStr Photospheric activity and rotation of the planet-hosting star CoRoT-4a
title_full_unstemmed Photospheric activity and rotation of the planet-hosting star CoRoT-4a
title_sort photospheric activity and rotation of the planet-hosting star corot-4a
publisher Astronomy & Astrophysics
publishDate 2020
url https://repositorio.ufrn.br/jspui/handle/123456789/28988
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