The HARPS search for southern extra-solar planets XX. Planets around the active star BD-08 degrees 2823

• Type: Article in International Scientific Journal
• Date: 2010

Authors

Hebrard, G (Author) Other; Udry, S (Author) Other; Lo Curto, G (Author) Other; Robichon, N (Author) Other; Naef, D (Author) Other; Ehrenreich, D (Author) Other; Benz, W (Author) Other; Bouchy, F (Author) Other; des Etangs, AL (Author) Other; Lovis, C (Author) Other; Mayor, M (Author) Other; Moutou, C (Author) Other; Pepe, F (Author) Other; Queloz, D (Author) Other; N.C. Santos (Author) FCUP; Segransan, D (Author) Other

Journal

Title: Astronomy and Astrophysics

Vol. 512

Final page: A46

ISSN: 0004-6361

Publisher: EDP Sciences

Indexing

ISI Web of Knowledge - 16 Citations

Scopus - 20 Citations

Other information

Authenticus ID: P-003-8ED

DOI: 10.1051/0004-6361/200913525

Abstract (EN): We report the detection of a planetary system around BD-08 degrees 2823 that includes at least one Uranus-mass planet and one Saturnmass planet. This discovery serendipitously originates from a search for planetary transits in the Hipparcos photometry database. This program preferentially selected active stars and did not allow the detection of new transiting planets. It allowed however the identification of the K3V star BD-08 degrees 2823 as a target harboring a multiplanet system, which we secured and characterized thanks to an intensive monitoring with the HARPS spectrograph at the 3.6-m ESO telescope in La Silla. The stellar activity level of BD-08 degrees 2823 complicates the analysis but does not prohibit the detection of two planets around this star. BD-08 degrees 2823b has a minimum mass of 14.4 +/- 2.1 M(circle dot) and an orbital period of 5.60 days, whereas BD-082 degrees 823c has a minimum mass of 0.33 +/- 0.03 M(Jup) and an orbital period of 237.6 days. This new system strengthens the observation that low-mass planets are preferentially found in multiplanetary systems, but not around high-metallicity stars as is the case for massive planets. It also supports the belief that active stars should not be neglected in exoplanet searches even when searching for low-mass planets.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10