Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-02-18
Astronomy and Astrophysics
Astrophysics
Accepted for publication in A&A. In a few occasions in the text, HD219828 was mistyped as HD219218. This has been now correcte
Scientific paper
10.1051/0004-6361:20066845
Two years ago a new benchmark for the planetary survey was set with the discoveries of three extrasolar planets with masses below 20$M_\oplus$. In particular, the serendipitous discovery of the 14$M_\oplus$ planet around $\mu$ Ara found with HARPS with a semi-amplitude of only 4 m s$^{-1}$ put in evidence the tremendous potential of HARPS for the search of this class of very low-mass planets. Aiming to discovering new worlds similar to $\mu$ Ara b, we carried out an intensive campaign with HARPS to observe a selected sample of northern stars covering a range of metallicity from about solar to twice solar. Two stars in our program were found to present radial velocity variations compatible with the presence of a planet-mass companion. The first of these, HD 219218, was found to be orbited by a planet with a minimum mass of 19.8 $M_\oplus$ and an orbital period of 3.83 days. It is the 11th Neptune-mass planet found so far orbiting a solar-type star. The radial velocity data clearly show the presence of an additional body to the system, likely of planetary mass. The second planet orbits HD 102195, has a mass of 0.45$M_{Jup}$ and an orbital period of 4.11 days. This planet has been already announced by Ge et al. (2006). Our data confirm and improve the orbital solution found by these authors. We also show that the high residuals of the orbital solution are caused by stellar activity, and use the bisectors of the HARPS cross-correlation function to correct the noise introduced by stellar activity. An improved orbital solution is obtained after this correction. This kind of analysis may be used in the future to correct the radial-velocities for stellar activity induced noise.
Bouchy Florent
Gieren Wolfgang
Lovis Ch.
Mayor Marcel
Melo Claudio
No associations
LandOfFree
A new Neptune-mass planet orbiting HD 219828 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A new Neptune-mass planet orbiting HD 219828, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A new Neptune-mass planet orbiting HD 219828 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-591331