Dust processing in the protoplanetary disks of the Orion OB1 Association

Details Dust processing in the protoplanetary disks of the Orion OB1 Association Dust processing in the protoplanetary disks of the Orion OB1 Association

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20408c&link_type=abstract

Spitzer Proposal ID #20408

Physics

Scientific paper

We propose to obtain mid-IR spectra using IRS on board Spitzer of four ~5 Myr old stars in the Orion OB1b association, which show indications of an advanced degree of dust evolution in their disks, and for which the ground-based observations suggest they are in the critical phase just prior to the opening of gaps in their disks. Our ongoing large-scale survey of the Orion OB1 star-forming region has allowed us to secure the ground-based photometric and spectroscopic data needed to fully characterize the stellar and accretion properties of these objects, including the mass accretion rates in their inner disks. Combined with the Spitzer IRS data and our theoretical analysis, we will be able to shed light on the state of solids in disks in which protoplanets may already be forming and starting to open gaps. Our analysis will include assesing the distribution of dust and its mineralogy. We have also requested time with HST to obtain far-UV spectra of these objects. These spectra, if the time is granted, will provide crucial information on the gas in the inner disk, which together with the Spitzer mid-IR data will allow us to build a comprehensive view, and gain unprecedented insight into the physical processes characterizing the evolution of gas and dust in inner circumstellar disks.

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