Details

Autor(en) / Beteiligte

• Wilson, P A
• Hebrard, G
• Santos, N C
• Sahlmann, J
• Montagnier, G
• Astudillo-Defru, N
• Boisse, I
• Bouchy, F
• Rey, J
• Arnold, L

Titel

The SOPHIE search for northern extrasolar planets: IX. Populating the brown dwarf desert

Ist Teil von

• Astronomy and astrophysics (Berlin), 2016-04, Vol.588, p.A144

Ort / Verlag

EDP Sciences

Erscheinungsjahr

2016

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Radial velocity planet search surveys of nearby solar-type stars have shown a strong scarcity of brown dwarf companions within ~5 AU. There is presently no comprehensive explanation for this lack of brown dwarf companions; therefore, increasing the sample of such objects is crucial to understand their formation and evolution. Based on precise radial velocities obtained using the SOPHIE spectrograph at Observatoire de Haute-Provence we characterise the orbital parameters of 15 companions to solar-type stars and constrain their true mass using astrometric data from the Hipparcos space mission. The nine companions not shown to be stellar in nature have minimum masses ranging from ~13 to 70 M sub(Jup), and are well distributed across the planet/brown dwarf mass regime, making them an important contribution to the known population of massive companions around solar-type stars. We characterise six companions as stellar in nature with masses ranging from a minimum mass of 76 + or - 4 M sub(Jup) to a mass of 0.35 + or - 0.03 M sub([middot in circle]). The orbital parameters of two previously known substellar candidates are improved.