IRS and MIPS observations of transitional disks with inner holes

Details IRS and MIPS observations of transitional disks with inner holes IRS and MIPS observations of transitional disks with inner holes

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30843m&link_type=abstract

Spitzer Proposal ID #30843

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Scientific paper

We propose to observe with IRS and MIPS2 at 70 microns a sample of 26 new young stars with inner holes in their disks, discovered as part of the c2d Spitzer Legacy Program. The sample is five times larger than the very small number of previously known transitional disks. The few objects of this kind that have been found to date led to the belief that they represent a very short-lived evolutionary phase of the young star+disk system. Thus, they may serve as pivotal links to the optically thick disk/Classical T Tauri star phase on the one hand and Weak-lined T Tauri stars or debris disks on the other. The objects were selected from the c2d mapping data of five nearby star-forming clouds thanks to their characteristic Spectral Energy Distribution, which shows no flux excess in the near- or mid-infrared range and a large excess at wavelengths longer than 10 microns. They are specially interesting because they have optically thick disks beyond a few AU but large inner holes where planets could be forming, and thus may provide a crucial window into the processes of Jovian planet assembly and disk dissipation. The IRS spectroscopy will be used to study the dust composition and evolutionary state of the disks and to characterize in detail the geometry of the inner holes. The MIPS2 imaging at 70 microns will be used, together with optical, 2MASS, IRAC,and MIPS1 fluxes to determine the physical and chemical structure of the outer disks. Sophisticated radiative transfer and dynamical disk models will be used to interpret the observations. The team, mostly c2d members, will apply its broad experience in IRS analysis and self-consistent SED fitting. We have complementary optical observations in hand and thus have a very well characterized sample.

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