Computer Science
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8364k&link_type=abstract
HST Proposal ID #8364
Computer Science
Hst Proposal Id #8364 Cool Stars
Scientific paper
The recent discoveries of substellar objects, including exoplanets and brown dwarfs, is rapidly revising our earlier pessimistic view of their abundance. The bizarre spectrum of the cool brown dwarf Gliese 229B, with strong features due to water and methane, has been the principal guide to the design of searches for more such objects. However, to date Gliese 229B remains the only cool brown dwarf known. We propose to use the NICMOS snapshot survey of stars within 10 pc of the sun to conduct an unbiased search for companions of these stars, based solely on their proper motions. The principal goal of the NICMOS survey was to find objects similar to the brown dwarf Gliese 229B by using differential imaging with filters which lie in and out of characteristic absorption bands. The survey, however, is limited because it can not establish with certainty that any object fitting the description above is an actual companion of the star nor could it find companions that are different from Gliese 229B. We have an extensive database of optical and near infrared images of the 1' fields of view centered on these stars. These images were taken repeatedly at multiple epochs over the past four years. With this data we can easily determine whether any of the point sources in the NICMOS images are common proper motion companions. We will publish all common proper motion companions found.
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