NOAO >   Observing Info >   Approved Programs >   2015A-0291

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Program Information for 2015A-0291


PI: Abhijith Rajan, Arizona State U., abhijithrajan@asu.edu
Address: School of Earth and Space Exploration, 781 Terrace Road, Tempe, AZ 85287 USA

CoI: Jennifer Patience, Arizona State U.
CoI: Paul Anthony Wilson, University of Exeter
CoI: Caroline Morley, UC Santa Cruz
CoI: Jonathan Fortney, UC Santa Cruz
CoI: Mark S Marley, NASA Ames Research Center
CoI: Frederic Pont, University of Exeter

Title: Brown dwarf Atmosphere Monitoring: Surveying the Coolest Brown Dwarfs

Abstract: Using the NEWFIRM camera on the 4m Mayall telescope, we propose to extend our Brown dwarf Atmosphere Monitoring (BAM) survey to the coolest northern brown dwarfs. The proposed observations will continue our exploration of the dynamic atmospheric evolution of ultracool T-dwarfs, which are a link between the coolest stars and exoplanets. Recent work on synthetic atmosphere models has indicated that sulfide and chloride clouds condense in the mid to late T-dwarf spectral range and may impact the observable properties of the atmospheres including color and variability. To obtain empirical measurements for comparison with model atmospheres, we propose to complete our 48 target Northern T-dwarf sample covering a wide range of near-IR colors consistent with different cloud models. Photometric monitoring is an essential tool to search for evidence and evolution of surface brightness inhomogeneities caused by cloud features, storms, or activity. The proposed program will provide a comprehensive dataset serving as a benchmark comparison to directly imaged planets, intensely irradiated Hot Jupiters, and synthetic atmospheric models incorporating different physical processes.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2015A):  KP-4m/NEWFIRM -- 6n on Apr 02 - Apr 07 2015


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 >   2015A-0291

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