A Spitzer Survey for Debris Disks in the Nearby 32 Ori Group

Details A Spitzer Survey for Debris Disks in the Nearby 32 Ori Group A Spitzer Survey for Debris Disks in the Nearby 32 Ori Group

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542822s&link_type=abstract

American Astronomical Society, AAS Meeting #215, #428.22; Bulletin of the American Astronomical Society, Vol. 42, p.348

Astronomy and Astrophysics

Astronomy

Scientific paper

We have obtained Spitzer Space Telescope IRAC (3.6, 4.5, 5.8, & 8.0 um) and MIPS (24 um & 70 um) observations of the 32 Ori Group, a recently discovered nearby stellar association situated towards northern Orion. The proximity of the group (95+-5 pc) has enabled a sensitive search for circumstellar dust around group members, and its age (25+-10 Myr) corresponds roughly to an epoch thought to be important for terrestrial planet formation in our own solar system (Nagasawa et al. 2007, Protostars and Planets V, p. 639). We quantify infrared excess emission due to circumstellar dust among group members, utilizing available optical (e.g. Hipparcos, Tycho) and near-IR photometry (2MASS) in addition to the Spitzer IR photometry. We report 4 out of the 12 objects which exhibit 24 um excess emission more than 4 sigma above the stellar photosphere though lacking excess emission at shorter wavelengths: HD 35656 (A0Vn), HD 36338 (F5), RX J0520.5+0616 (K4), and HD 35499 (F3). We model the infrared excess emission using circumstellar dust disk models, placing constraints on the dust mass and distribution among the group members.

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