Mid-infrared variability as a probe of protoplanetary disk structure

Details Mid-infrared variability as a probe of protoplanetary disk structure Mid-infrared variability as a probe of protoplanetary disk structure

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40372m&link_type=abstract

Spitzer Proposal ID #40372

Physics

Scientific paper

We propose to obtain multi-epoch MIPS and IRS observations of the young stellar cluster IC 348 in order to study in detail the mid-infrared variability of circumstellar disks. Preliminary results based on just the two existing epochs of imaging data indicate a surprising degree of variability from 3.6-24 microns, with nearly half of all known cluster members with disks exhibiting variable emission by up to half a magnitude. Interestingly, some of the strongest variables are stars with significantly evolved disks, including transition objects with optically thin inner holes. By constraining the variability timescales with high-cadence MIPS 24 micron imaging and the spectral shape of the flux changes with IRS 5-37 micron spectra, we will be able to isolate and characterize the source(s) of the mid-IR variability. These data will provide a valuable tool for understanding disk structure, particularly in the case of evolved disks whose structure may be highly modified by ongoing planet formation.

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