NOAO >   Observing Info >   Approved Programs >   2002B-0142

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Proposal Information for 2002B-0142


PI: I. N. Reid, Space Telescope Science Institute, inr@stsci.edu
Address: 3900 San Martin Drive, Baltimore, MD 21218, USA

CoI: P. Allen, University of Pennsylvania
CoI: David Koerner, University of Pennsylvania

Title: A search for planetary-mass companions to ultracool dwarfs

Abstract: We have been using multi-epoch near-infrared imaging with the IRTF to search for brown dwarf and planetary-mass companions to 160 ultracool dwarfs. In most cases, candidate companions can be eliminated based either on near-infrared colours or lack of common proper motion with the late-M or L potential primary. However, 33 low proper-motion targets have potential companions with neutral (J-K) colours, consistent with either genuine T dwarf companions or distant halo subdwarfs. Optical photometry provides a simple means of discriminating between these alternatives. We propose to use I-band imaging with WIYN to determine whether any of these candidate companions have (I-J) colours consistent with those expected for cool brown dwarfs.


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