NOAO >   Observing Info >   Approved Programs >   2016A-0378

Small NOAO Logo

Program Information for 2016A-0378


PI: Eric Mamajek, Segev BenZvi, emamajek@pas.rochester.edu
Address: Department of Physics & Astronomy, 500 Wilson Blvd, Rochester, NY 14627-0171 USA

CoI: Fred Moolekamp, Segev BenZvi
CoI: David James, NOAO
CoI: Kevin Luhman, Pennsylvania State U.
CoI: Stan Metchev, University of Western Ontario

Title: ARCoIRIS Survey of DECam Brown Dwarf Candidates in the Nearest OB Association

Abstract: We propose to use the new ARCoIRIS spectrograph on the Blanco 4-m to conduct a near-IR spectroscopic survey of newly discovered candidate substellar objects in the nearest OB association (Sco-Cen). The proposed observations are part of an NSF-supported survey to use DECam to discover and ARCoIRIS to spectrally characterize young ($sim$10-20 Myr) benchmark ultracool dwarfs in the two nearest OB subgroups to the Sun (Lower Centaurus-Crux and Upper Centaurus-Lupus; d $simeq$ 100-150 pc). The 23 brown dwarf candidates were identified using izY photometry and proper motions based on two epochs of DECam imagery taken in 2013 and 2015, combined with archival photometry and astrometry from 2MASS and WISE. The objects have proper motions ($sim$6 mas/yr uncertainties) and color-mag positions consistent with that predicted for late-M/L-type members of Sco-Cen (with estimated masses ranging from near the H-burning limit to the D-burning limit; $sim$13-75 M$_{Jup}$). This survey will provide an important new sample of young, low surface gravity ultracool dwarfs with well-constrained ages and distances that will improve our understanding of brown dwarf atmospheres, allow comparison to the spectra of imaged planetary companions, and to help constrain brown dwarf formation models through constraining their disk evolution and multiplicity.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2016A):  CT-4m/ARCoIRIS -- 1n on Jun 11 2016


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2016A-0378

noaoprop-help@noao.edu

Small NOAO Logo