The HARPS search for southern extra-solar planets XXIV. Companions to HD 85390, HD 90156, and HD 103197: a Neptune analog and two intermediate-mass planets

• Type: Article in International Scientific Journal
• Date: 2011

Authors

Mordasini, C (Author) Other; Mayor, M (Author) Other; Udry, S (Author) Other; Lovis, C (Author) Other; Segransan, D (Author) Other; Benz, W (Author) Other; Bertaux, JL (Author) Other; Bouchy, F (Author) Other; Lo Curto, G (Author) Other; Moutou, C (Author) Other; Naef, D (Author) Other; Pepe, F (Author) Other; Queloz, D (Author) Other; N.C. Santos (Author) FCUP

Journal

Title: Astronomy and Astrophysics

Vol. 526

Final page: A111

ISSN: 0004-6361

Publisher: EDP Sciences

Indexing

ISI Web of Knowledge - 21 Citations

Scopus - 21 Citations

Other information

Authenticus ID: P-002-VGT

DOI: 10.1051/0004-6361/200913521

Abstract (EN): We report the detection of three new extrasolar planets orbiting the solar type stars HD 85390, HD 90156 and HD 103197 with the HARPS spectrograph mounted on the ESO 3.6-m telescope at La Silla observatory. HD 85390 has a planetary companion with a projected intermediate mass (42.0 M-circle plus) on a 788-day orbit (a = 1.52 AU) with an eccentricity of 0.41, for which there is no analog in the solar system. A drift in the data indicates the presence of another companion on a long-period orbit, which is however not covered by our measurements. HD 90156 is orbited by a warm Neptune analog with a minimum mass of 17.98 M-circle plus (1.05 M(sic)), a period of 49.8 days (a = 0.25 AU), and an eccentricity of 0.31. HD 103197 has an intermediate-mass planet on a circular orbit (P = 47.8 d, M sin i = 31.2 M-circle plus). We discuss the formation of planets of intermediate mass (similar to 30-100 M-circle plus), which should be rare inside a few AU according to core accretion formation models.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9