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A Spitzer Space Telescope Survey for Dusty Debris Disks in the Nearby 32 Orionis Group by Shvonski, Alexander J.; Mamajek, Eric E.; Kim, Jinyoung Serena; Meyer, Michael R.; Pecaut, Mark J. is a scholarly article available to read on EtoBox.

What is A Spitzer Space Telescope Survey for Dusty Debris Disks in the Nearby 32 Orionis Group about?

We report Spitzer Space Telescope IRAC 3.6, 4.5, 5.8 and 8 um and MIPS 24 and 70 um observations of the 32 Ori Group, a recently discovered nearby stellar association situated towards northern Orion. The proximity of the group (~93 pc) has enabled a sensitive search for circumstellar dust around group members, and its age (~20 Myr) corresponds roughly to an epoch thought to be important for terrestrial planet formation in our own solar system. We quantify infrared excess emission due to circumstellar dust among group members, utilizing available optical (e.g. Hipparcos, Tycho) and near-IR (2MASS) photometry in addition to the Spitzer IR photometry. We report 4 out of the 14 objects which exhibit 24 um excess emission more than 4\sigma above the stellar photosphere (>20%) though lacking excess emission at shorter wavelengths: HD 35656 (A0Vn), HD 36338 (F4.5), RX J0520.5+0616 (K3), and HD 35499 (F4). Two objects (HD 35656 and RX J0520.0+0612) have 70 um excesses, although the latter lacks 24 um excess emission. The 24 um disk fraction of this group is 29(+14,-9%), which is similar to previous findings for groups of comparable ages and places 32 Ori as the young stellar group with the

Author

Shvonski, Alexander J.; Mamajek, Eric E.; Kim, Jinyoung Serena; Meyer, Michael R.; Pecaut, Mark J.

Published

2016

Language

EN