A Search for Brown Dwarfs and Luminous Young Planets in the Hyades

Details A Search for Brown Dwarfs and Luminous Young Planets in the Hyades A Search for Brown Dwarfs and Luminous Young Planets in the Hyades

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6137r&link_type=abstract

HST Proposal ID #6137

Computer Science

Hst Proposal Id #6137 Cool Stars

Scientific paper

We propose a photometric search for luminous, young, massive planets and very low-temperature { 1200 K} brown dwarfs as companions to 20 low-mass stars in the Hyades {during Cycle 5, we will observe the faintest 8 of these stars}. Such massive planets and brown dwarfs in this cluster should be clearly distinguishable from very low-mass stars in both effective surface temperature and luminosity. The Planetary Camera will be used to obtain 1-Mum images of the primary stars in order to search for faint companions. We are undertaking a complementary project at the NASA IRTF involving imaging at J {1.2 Mum}, H {1.6 Mum}, and K {2.2 Mum} for a sample of 75 low-mass Hyades stars, including the 20 stars proposed here. The IRTF search will reach K=18, while this HST search will reach I=23-24. Cool substellar companions could have I-K >= 8, so the IRTF search will likely be more sensitive, but will also have much poorer spatial resolution. Since a large fraction of stellar companions are within 10 AU of their primary {Henry 1991}, and at the distance of the Hyades 0."1 5 AU, the guaranteed 0."1 spatial resolution of the PC is crucial for this project. A very similar HST Cycle 4 SNAP program is already underway {PI: N. Reid} for I-band imaging of a sample of 35 low-mass Hyades stars to I=20. Our program will go deeper by 3-4 magnitudes, by using the 1-Mum {vs I- band} filter and by taking longer effective exposures. This push to fainter luminosities is substantial, especially considering the large uncertainties associated with current brown dwarf models.

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