Journal
ASTRONOMY & ASTROPHYSICS
Volume 526, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/200913521
Keywords
planetary systems; techniques: radial velocities; stars: individual: HD 85390; stars: individual: HD 90156; stars: individual: HD 103197; planetary systems: formation
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Funding
- Alexander von Humboldt foundation
- European Research Council/European Community
- Fundacao para a Ciencia e a Tecnologia (FCT), Portugal
- [PTDC/CTE-AST/098528/2008]
- [PTDC/CTE-AST/098604/2008]
- Fundação para a Ciência e a Tecnologia [PTDC/CTE-AST/098604/2008] Funding Source: FCT
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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.
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