Brown dwarf atmospheric variability observations

Details Brown dwarf atmospheric variability observations Brown dwarf atmospheric variability observations

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9844g&link_type=abstract

HST Proposal ID #9844

Physics

Hst Proposal Id #9844 Cool Stars

Scientific paper

We propose to use NIC1 and NIC2 to study brown dwarfs for atmospheric variability. We will observe a sequence of early Ts, a detected variable T2, a T3 and a T4.5. Atmospheric variability, that is expected by some models for these objects, would constrain the physical parameters of cloud vertical distribution, horizontal homogeneity and the dynamics of the very cool atmospheres. The existence and amplitude of the variations would reveal the size and distribution of the cloud cover over the surface of the brown dwarf and test a model explaining the rapidity of the L to T type transition. The relative color changes would constrain the vertical extent of dynamical process and the depth in the atmosphere at which they take place. If a periodicity is measured, the rotational period of the dwarf could be estimated. HST provides the unique and crucial opportunity to observe beyond Earth atmospheric variable absorption, particularly in the important water bands.

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