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Discovery of a companion at the brown dwarf limit to the solar‐type star Gliese 29
Author(s) -
Chini R.,
Fuhrmann K.,
Pozo Nuñez F.,
Ramolla M.,
Kaderhandt L.,
Niedworok N.,
Hodapp K.W.
Publication year - 2016
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.201512309
Subject(s) - physics , brown dwarf , proper motion , astrophysics , photometry (optics) , astronomy , solar mass , population , stars , demography , sociology
Gliese 29 is a 7 to 8 Gyr old, southern Population I turnoff star with a large proper motion of 1″/yr. Using recent direct imaging observations with the 0.8 m Infrared Imaging System (IRIS) of the Universitätssternwarte Bochum near Cerro Armazones in Chile, we demonstrate that the faint source 2MASS J00402651–5927168 at a projected angular separation ρ = 6.″35 is a common‐proper‐motion companion to Gl 29. Provided this source is not part of a further subsystem, the IRIS J ‐ and K s ‐band photometry either implies a spectral type of about L2, based on its absolute magnitude, or an approximate mass M B ≃ 0.077 M ⊙ , suggesting that it may even be a brown dwarf. Assuming a face‐on circular orbit this faint companion orbits Gl 29 in 1880 years. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)