An Infrared coronagraphic survey for substellar companions
Jun, 2005
17 pages
Published in:
- Astron.J. 130 (2005) 1845-1861
e-Print:
- astro-ph/0506358 [astro-ph]
DOI:
View in:
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Abstract: (arXiv)
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).Note:
- 11 figures, accepted by AJ
- stars: low-mass, brown dwarfs
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