A deep look at the evolution of 4-10 Myr old disks in Orion OB1

Details A deep look at the evolution of 4-10 Myr old disks in Orion OB1 A deep look at the evolution of 4-10 Myr old disks in Orion OB1

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50360b&link_type=abstract

Spitzer Proposal ID #50360

Physics

Scientific paper

We propose to obtain deep IRAC/MIPS observations of recently discovered populations of stars with ages 4-10 Myr in the Orion OB1 association. Many of the young members in these regions are concentrated in distinct stellar aggregates, with differing ages, but presumably sharing a common origin. Among them is the 25 Ori group, by far the most populous 10 Myr old sample yet known within 500 pc. Our ongoing large-scale survey of the Orion OB1 star-forming region has allowed us to find these elusive populations and secure the photometric and spectroscopic data needed to fully determine the stellar and accretion properties of these objects, from ~3 solar masses down to the lowest mass stars at the substellar boundary. The proposed Spitzer IRAC/MIPS observations, combined with existing ground-based optical and near-infrared data, will yield spectral energy distributions for characterizing protoplanetary disks, as a function of stellar mass and environment. This will enable us to discern the overall trends in circumstellar disk evolution during the important age range 4-10 Myr, when planet formation and disk dissipation are expected to occur, thus providing the best constraints yet for theoretical models in this pivotal stage.

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