Asteroseismology of the planet-hosting star Arae

I. The acoustic spectrum

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

Abstract

We present HARPS spectroscopy of μ 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.