An IR search for faint companions to Pleiades very low-mass stars and brown dwarfs

Details An IR search for faint companions to Pleiades very low-mass stars and brown dwarfs An IR search for faint companions to Pleiades very low-mass stars and brown dwarfs

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7899m&link_type=abstract

HST Proposal ID #7899

Computer Science

Hst Proposal Id #7899 Cool Stars Low-Mass Stars

Scientific paper

The Pleiades has been the best site for brown dwarf {BD} searches, with half of the presently "confirmed" BDs being Pleiades members. It is also the only cluster or star-forming region where it is currently possible to estimate the IMF to below the hydrogen burning mass limit with any confidence. We propose to obtain NICMOS images of a set of highly probable very low-mass Pleiades members to search for lower mass companions. We will use any identified companions to provide empirical constraints on BD models and to improve the IMF. In the mass range of interest, Pleiades age BD's are expected to range in temperature from about 2500 to 900 K, and thus are predicted to have a large range in molecular band properties and predicted colors {e.g., within this temperature range one should see the effects of both grain formation and methane formation}. Our choice of NICMOS filters will provide key information on the surface temperature of any detected companion. NICMOS PSF simulations show that we can detect secondaries with masses of about 25 Jupiters orbiting at about 10.3 AU from our targets. Companions with masses about 10 Jupiters can be detected at separations of 35 AU. Therefore, we will explore deeper into the substellar domain of the Pleiades than any previous survey.

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