A search for planetary-mass companions to ultracool dwarfs

Details A search for planetary-mass companions to ultracool dwarfs A search for planetary-mass companions to ultracool dwarfs

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002noao.prop..142r&link_type=abstract

NOAO Proposal ID #2002B-0142

Computer Science

Scientific paper

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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