Protoplanetary Disks Around Very Low-Mass Stars in the Coronet Cluster

Details Protoplanetary Disks Around Very Low-Mass Stars in the Coronet Cluster Protoplanetary Disks Around Very Low-Mass Stars in the Coronet Cluster

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30536h&link_type=abstract

Spitzer Proposal ID #30536

Computer Science

Scientific paper

We propose to take IRS low-resolution spectra of a set of 16 very low-mass stars and brown dwarfs in the Coronet cluster. These objects, whose membership has been confirmed via X-ray and/or optical surveys, have been observed with IRAC and MIPS, revealing the presence of disks at different evolutionary stages, from optically thick accretion disks, to potential disks with inner gaps and maybe remnant ``debris''-like disks. With a relatively short program, these IRS observations will allow us to study one of the largest samples of very-low mass stars with disks at a very young age (~ 1 Myr) in one of the most interesting and nearby regions of recent and ongoing star formation, the Coronet cluster, located at 130 pc. We will examine the disk structure, the presence of inner gaps and walls (maybe related to planet formation), and the grain size and mineralogy, comparing them to the observations of higher-mass stars and to older populations of very low-mass stars and brown dwarfs (i.e., Chameleon, ~9 Myr), in order to determine whether the properties of their disks are similar, and whether the observable differences in disk structure and composition are a pure effect of time evolution, or may be related to the initial conditions of the stars and their formation and/or to the effects of environment.

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