PI: Gaspard Duchene, UC Berkeley (Astronomy), email@example.com
Address: Department of Astronomy, 601 Campbell Hall #3411, Berkeley, CA, 94720-3411, USA
CoI: Serge Correia, Astrophysical Institute Potsdam (AIP)
CoI: Thorsten Ratzka, Astrophysical Institute Potsdam (AIP)
Title: Probing the nature of optically obscured companions to young stars
Abstract: We propose spatially-resolved R 50 000 PHOENIX observations of Glass I, a member of the class of Infrared Companions (IRCs) to T Tauri stars. The nature of these objects remains elusive, as they apparently defy the paradigm of coevality in young multiple systems. The main goals are (1) to search for the potentially highly-veiled photospheric absorption lines with unprecedented spectral resolution in order to derive the intrinsic stellar nature (spectral type, extinction, continuum excess) of one of these intriguing young objects, (2) to derive the accretion properties (accretion rate, kinematics of brackett gamma line), and (3) characterize the inner circumstellar environment through the search for molecular absorption/emission like HCN and/or non-stellar ^12CO features, as recently achieved for the prototype IRC, namely T Tau Sa (Duchene et al. 2005). These observations will allow us to better constrain the nature and geometry of the obscuring material towards IRCs and to probe the organic chemistry, gas temperatures, and gas kinematics in the planet-forming zones close to a young star.
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