NOAO >   Observing Info >   Approved Programs >   2011A-0266

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Proposal Information for 2011A-0266


PI: David R. Ardila, NASA Herschel Science Center, ardila@ipac.caltech.edu
Address: Infrared Processing and Analysis Center, 770 S. Wilson Ave., Pasadena, CA 91125, USA

CoI: Christopher Johns-Krull, Rice University
CoI: Gregory Herczeg, Max-Planck-Institut für extraterrestrische Physik
CoI: Robert Mathieu, University of Wisconsin at Madison

Title: Accretion in Close Pre-Main-Sequence Binaries

Abstract: The role of multiplicity in the accretion process remains an open issue for young stars. We will use GNRIS, simultaneously with HST-COS, to observe the circumbinary accretion flow in close Classical T Tauri binaries, as a function of orbital phase. The observations will help us understand how the gas and dust cross the circumbinary gap (as observed in CO at 4.6 (micron) and K-band excess), how the gas is captured by the magnetosphere (Br(gamma)), and is either accreted (HST's CIV 1550 \AA) or expelled in an outflow (HeI 1.08 (mu)m). We will test model predictions regarding the role of orbital dynamics and the magnetosphere(s) on the accretion process. We will observe UZ Tau E (mass ratio q=0.3, e=0.33) and DQ Tau (q=1, e=0.58) in four phases, over three orbital periods. The study of young binaries has traditionally been hampered by the lack of synoptic observations of the kind proposed here. The availability of GNIRS-Gemini and COS-HST provides a unique opportunity to obtain a full dataset that will allow for a complete modeling of these systems.


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