NOAO >   Observing Info >   Approved Programs >   2014B-0206

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Proposal Information for 2014B-0206


PI: Rahul I. Patel, Stony Brook University, rahul.patel.1@stonybrook.edu
Address: Physics Department, 100 Nicolls Rd., Stony Brook, NY 11790, USA

CoI: Stanimir Metchev, U of Western Ontario & SBU

Title: Age Diagnostics of New WISE Detected Debris Disk-Host Stars

Abstract: We propose to complete a program of R=40,000 Mayall and AAT echelle spectroscopy of newly-identified debris disk-host stars from the WISE all-sky catalog. The sample was selected by cross-correlating WISE sources with the Hipparcos catalog, and selecting only main-sequence stars with W3 (12(mu) m) or W4 (22(mu) m) excesses within 75 pc. These stars are already the subject of several intensive high-contrast imaging programs to resolve their debris disks, and to image new extrasolar planets. Our echelle data will elucidate crucial stellar characteristics, such as age (for FKG stars) and binarity, necessary for the interpretation of the evolutionary stage of the circumstellar dust and of any detected exoplanets. Our spectra will also reveal trace amounts of circumstellar gas around any of the B and A stars with nearly edge-on disks, and so determine the availability of remnant material for giant planet formation. We have also been granted time at Subaru for a complementary study to characterize new high-priority exozodi targets we have identified in the process of our analysis. This proposal is a continuation of a 2012B-2014A Mayall/AAT survey program, during which we observed most of the stars with newly- discovered mid-infrared excesses. Because of poor conditions at the AAT in 2013B, we are now requesting additional time to complete this survey and our investigation of the evolution of low-luminosity dust in the terrestrial planet zone.


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