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HAL - OMP | |
| HAL : hal-00287302, version 1 |
| arXiv : 0803.2029 |
| Code Bibliographique ADS : 2008A&A...482L...5V |
| DOI : 10.1051/0004-6361:20079342 |
| Fiche détaillée |  Récupérer au format |
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| Astronomy and Astrophysics 482 (2008) L5-L8 |
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| The exoplanet-host star ? Horologii: an evaporated member of the primordial Hyades cluster |
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| S. Vauclair 1M. Laymand 1 |
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| (05/2008) |
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| Aims. We show that the exoplanet-host star iota Horologii, alias HD 17051, which belongs to the so-called Hyades stream, was formed within the primordial Hyades stellar cluster and has evaporated towards its present location, 40 pc away. Methods: This result has been obtained unambiguously by studying the acoustic oscillations of this star, using the HARPS spectrometer in La Silla Observatory (ESO, Chili). Results: Besides the fact that ? Hor belongs to the Hyades stream, we give evidence that it has the same metallicity, helium abundance, and age as the other stars of the Hyades cluster. They were formed together, at the same time, in the same primordial cloud. Conclusions: This result has strong implications for theories of stellar formation. It also indicates that the observed overmetallicity of this exoplanet-host star, about twice that of the Sun, is original and not caused by planet accretion during the formation of the planetary system. ! |
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| 1 : | Laboratoire Astrophysique de Toulouse-Tarbes (LATT) |
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CNRS : UMR5572 – INSU – Observatoire Midi-Pyrénées – Université Paul Sabatier [UPS] - Toulouse III |
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| 2 : | Observatoire de Geneve |
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University of Geneva |
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| 3 : | Laboratoire d'Astrophysique de Marseille (LAM) |
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CNRS : UMR6110 – INSU – Université de Provence - Aix-Marseille I |
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| 4 : | Observatoire de Haute-Provence (OHP) |
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CNRS : USR2207 – INSU – Université de Provence - Aix-Marseille I |
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| 5 : | Institut d'Astrophysique de Paris (IAP) |
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CNRS : UMR7095 – INSU – Université Pierre et Marie Curie [UPMC] - Paris VI |
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| 6 : | UMS 831 unité mixte de service (UMS 831) |
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CNRS : UMS831 – Institut de recherche pour le développement [IRD] – CNES – INSU – Université Paul Sabatier [UPS] - Toulouse III – Observatoire Midi-Pyrénées |
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| Domaine | : | Physique/Astrophysique/Cosmologie et astrophysique extra-galactique |
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| stars: oscillations – stars: planetary systems – stars: abundances – Galaxy: open cluster and associations: individual: Hyades |
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| Lien vers le texte intégral : |
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| http://fr.arXiv.org/abs/0803.2029 |
| hal-00287302, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00287302 | |
| oai:hal.archives-ouvertes.fr:hal-00287302 | |
| Contributeur : Dominique Lullier | |
| Soumis le : Mercredi 11 Juin 2008, 14:50:57 | |
| Dernière modification le : Mercredi 11 Juin 2008, 14:50:57 | |
