NOAO >   Observing Info >   Approved Programs >   2010A-0469

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Proposal Information for 2010A-0469


PI: Jacqueline Faherty, Stony Brook University/ American Museum of Natural History, jfaherty@amnh.org
Address: Physics Department, 79th Street and Central Park West, New York, NY 10023, USA

CoI: Dagny Looper, University of Hawaii
CoI: Subhanjoy Mohanty, Imperial College London
CoI: Adam Burgasser, UCSD

Title: Deciphering the Classical T Tauri Phase in Very Low Mass Stars: Photometric Monitoring of TWA30AB

Abstract: The classical T Tauri phase in newborn stars - marked by magnetospheric accretion of disk gas allied with outflowing winds and jets - is now known to be ubiquitous all the way from solar mass stars down to brown dwarfs. The physical mechanisms driving the accretion and outflow, however, remain hotly debated, since observational probes of the innermost disk regions, where the relevant processes occur, are extremely rare. TWA30A and 30B, a newly discovered pair of young, very low mass (~0.1 M_\odot) classical T Tauri stars in the nearby TW Hydrae Association, promise to become benchmark objects in this regard. Both show variations in photometry, reddening and spectroscopic accretion/outflow signatures strongly suggesting temporal modulation of the star-disk interaction at the disk inner edge. To verify this hypothesis and compare to theoretical predictions, it is essential to discover the periodicity of these variations and their relationship to the stellar rotation. To accomplish this, we propose optical and NIR photometric monitoring of the two sources, over a continuous 5 day period (2 hr/night), with ANDICAM on the CTIO-1.3m.


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 >   2010A-0469

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