NOAO >   Observing Info >   Approved Programs >   2017A-0141

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Program Information for 2017A-0141


PI: Adam Burgasser, UC San Diego, aburgasser@ucsd.edu
Address: UCSD Mail Code 0424, 9500 GILMAN DRIVE, LA JOLLA, CA 92093 USA

CoI: Daniella Bardalez Gagliuffi, UC San Diego
CoI: Johannes Sahlmann, European Space Agency
CoI: Christopher R Gelino, NASA Herschel Science Center
CoI: Maria Rosa Zapatero Osorio, CAB

Title: Mass Measurements Across the Hydrogen Burning Limit: Astrometric Orbits for Spectral Binaries (Northern Sample)

Abstract: Mass measurements for well-resolved very low mass binaries require long (>5-10 yr) monitoring periods, while the secondaries of radial velocity variables and microlens systems cannot be directly observed. We have uncovered a new population of short-period, blended-light spectral binaries of low mass stars and brown dwarfs whose orbits can be measured in <3 yr and atmospheres directly investigated. To complement ongoing AO imaging and radial velocity monitoring programs, we have initiated a long-term astrometric monitoring campaign of 8 select spectral binary systems, building off of a previous pilot progam that established per-epoch precisions of < 1 mas. Our 4 Southern targets have been awarded long-term status; here we request long-term monitoring of our 4 Northern targets. Our observations will yield precise measurements of masses across the hydrogen burning limit, as well as system ages and orbital properties, valuable empirical data for tests of low-mass binary formation and brown dwarf evolution models.

Program Type: Long Term/Galactic

Scheduled Nights:
Run 1 (2017A):  GEM-NQ/GMOSN -- 10.7hrs band 1 (GN-2017A-Q-24)
Run 1 (2017B):  GEM-NQ/GMOSN -- 11.5hrs band 1 (GN-2017B-Q-4)


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 >   2017A-0141

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