A Survey of 5 Myr Disks around Brown Dwarfs in the Upper Scorpius OB Association

Details A Survey of 5 Myr Disks around Brown Dwarfs in the Upper Scorpius OB Association A Survey of 5 Myr Disks around Brown Dwarfs in the Upper Scorpius OB Association

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20103h&link_type=abstract

Spitzer Proposal ID #20103

Computer Science

Scientific paper

We propose to use the Spitzer Space Telescope to study the disks around 35 spectroscopically confirmed brown dwarfs in the Upper Scorpius OB association. The Spitzer data combined with our previous work on young brown dwarf stellar parameters, accretion rates, and binarity will allow us to address with the Upper Sco sample several fundamental questions regarding brown dwarf disk properties and evolution. IRAC and MIPS observations will allow us to determine very precise energy distributions from 3.6 to 24 microns, which is important for determining the circumstellar disk structure; photometrically calibrated 5 to 40 micron IRS spectra will allow us to determine disk composition. Most importantly, our proposed Spitzer program will probe sources in the as-yet unexplored ~5 Myr age-range when brown dwarfs are in the process of dissipating gas and dust in their disks and possibly assembling planets. Obtaining spectral energy distributions for brown dwarfs at this age combined with approved Spitzer GTO and GO programs of younger (<1-2 Myr) sources will determine an evolutionary sequence for the circumstellar material surrounding young substellar objects. Thus, we will be able to assess for the first time if brown dwarf disk chemistry and structure evolve in the same manner and on similar time scales as for disks around higher mass stellar objects.

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