Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-06-15
Astron.J.130:1845-1861,2005
Astronomy and Astrophysics
Astrophysics
11 figures, accepted by AJ
Scientific paper
10.1086/432839
We have used the F160W filter (1.4-1.8 um) and the coronagraph on the Near-InfraRed Camera and Multi-Object Spectrometer (NICMOS) on the Hubble Space Telescope (HST) to survey 45 single stars with a median age of 0.15 Gyr, an average distance of 30 pc, and an average H-magnitude of 7 mag. For the median age we were capable of detecting a 30 M_Jup companion at separations between 15 and 200 AU. A 5 M_Jup object could have been detected at 30 AU around 36% of our primaries. For several of our targets that were less than 30 Myr old, the lower mass limit was as low as a Jupiter mass, well into the high mass planet region. Results of the entire survey include the proper motion verification of five low-mass stellar companions, two brown dwarfs (HR7329B and TWA5B) and one possible brown dwarf binary (Gl 577B/C).
Becklin Eric E.
Beuzit Jean Luc
Dumas Cédric
Heap Sally
Hines Dean
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