The Lifetime of Circumstellar Disks Around Low-Mass Brown Dwarfs

Details The Lifetime of Circumstellar Disks Around Low-Mass Brown Dwarfs The Lifetime of Circumstellar Disks Around Low-Mass Brown Dwarfs

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sptz.prop80187l&link_type=abstract

Spitzer Proposal ID #80187

Physics

Scientific paper

The lifetimes of optically thick accretion disks around young stars are important because they represent a limit on the amount of time available for the formation of giant planets. Estimating disk lifetimes as a function of stellar mass requires measurements of disk fractions for samples of stars that cover a wide range of ages and masses. Previous photometric surveys with Spitzer have explored much of this phase space. However, one area that has relatively few disk fraction measurements is the least massive brown dwarfs at >3 Myr (<0.03 Msun). Therefore, we propose to measure IRAC photometry for the least massive known brown dwarfs in the Upper Sco association (5 Myr). We will use the IRAC data to measure the disk fraction in this sample, which will then be combined with disk fractions previously measured with Spitzer in younger regions to estimate the typical lifetimes of disks around the smallest brown dwarfs.

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