ACS Imaging and STIS Spectroscopy of Binary Brown Dwarfs

Details ACS Imaging and STIS Spectroscopy of Binary Brown Dwarfs ACS Imaging and STIS Spectroscopy of Binary Brown Dwarfs

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9451b&link_type=abstract

HST Proposal ID #9451

Astronomy and Astrophysics

Astronomy

Hst Proposal Id #9451

Scientific paper

We have compiled a sample of 9 spatially resolved binary brown dwarfs {18 objects}, and now propose ACS imaging and STIS spectroscopic follow-up observations. While theoretical models on the interplay of chemical and physical processes governing brown dwarf atmospheres have reached a high level of sophistication, interpretation of observational data remains difficult. As brown dwarfs never stabilize themselves on the hydrogen main sequence, there is always an ambiguity between the temperature or luminosity of any brown dwarf and its mass or age. The individual components of brown dwarf binaries, however, are expected to be coeval and have the same underlying chemical composition. This provides crucial constraints on any model, thus greatly reducing the number of the free parameters. The aim is to obtain photometric and spectroscopic data to probe the physical and chemical properties of the brown dwarf atmospheres, as well as second epoch astrometric data to characterize th e orbital motion. The study will provide important feedback on theoretical model atmospheres and evolutionary tracks for brown dwarfs. As such, it will be an important step towards a better understanding of objects with spectral properties intermediate between those of giant planets and late-type stars.

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