The HARPS survey for southern extra-solar planets II. A 14 Earth-masses exoplanet around mu Arae

Details The HARPS survey for southern extra-solar planets II. A 14 Earth-masses exoplanet around mu Arae The HARPS survey for southern extra-solar planets II. A 14 Earth-masses exoplanet around mu Arae

2004-08-25

arxiv.org/abs/astro-ph/0408471v2

Astron.Astrophys.426:L19-L23,2004

Astronomy and Astrophysics

Astrophysics

Replaced on 2004-09-10 by final version, accepted for publication in A&A Letters

Scientific paper

10.1051/0004-6361:200400076

In this letter we present the discovery of a very light planetary companion to the star mu Ara (HD160691). The planet orbits its host once every 9.5days, and induces a sinusoidal radial velocity signal with a semi-amplitude of 4.1 m/s, the smallest Doppler amplitude detected so far. These values imply a mass of m2 sini = 14 earth-masses. This detection represents the discovery of a planet with a mass slightly smaller than that of Uranus, the smallest ``ice giant" in our Solar System. Whether this planet can be considered an ice giant or a super-earth planet is discussed in the context of the core-accretion and migration models.

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