EDP Sciences
Free access
Volume 440, Number 2, September III 2005
Page(s) 609 - 614
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20052697

A&A 440, 609-614 (2005)
DOI: 10.1051/0004-6361:20052697

Asteroseismology of the planet-hosting star $\mathsf{\mu}$ Arae

I. The acoustic spectrum
F. Bouchy1, 2, M. Bazot3, N. C. Santos4, 5, S. Vauclair3 and D. Sosnowska5

1  Laboratoire d'Astrophysique de Marseille, Traverse du Siphon, 13013 Marseille, France
    e-mail: Francois.Bouchy@oamp.fr
2  Observatoire de Haute Provence, 04870 St. Michel l'Observatoire, France
3  Université Paul Sabatier, Observatoire Midi-Pyrénées, 14 Av. E. Belin, 31400 Toulouse, France
4  Lisbon Observatory, Tapada da Ajuda, 1349-018 Lisboa, Portugal
5  Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland

(Received 13 January 2005 / Accepted 4 March 2005)

We present HARPS spectroscopy of $\mu$ Arae (HD 160691) performed for studying the origin of the metallicity excess in this planet-hosting stars. The asteroseismologic campaign led to the previously reported discovery of a 14 earth mass planetary companion (Santos et al. 2004b, A&A, 426, L19). The present analysis reinforces this interpretation by excluding other possible processes for explaining the observed Doppler variation and leads to the identification of up to 43 p-mode oscillations with l = 0-3, frequencies in the range 1.3-2.5 mHz and amplitudes in the range 10-40 cm s-1.

Key words: stars: individual: $\mu$ Arae -- stars: oscillations -- techniques: radial velocities -- stars: planetary systems

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