J. A. Eisner et al. 2009 ApJ 692 309 doi:10.1088/0004-637X/692/1/309
J. A. Eisner1,2,3, J. R. Graham2, R. L. Akeson4 and J. Najita5
Show affiliationsWe present spatially resolved near-IR spectroscopic observations of 15 young stars. Using a grism spectrometer behind the Keck interferometer, we obtained an angular resolution of a few milliarcseconds and a spectral resolution of 230, enabling probes of both gas and dust in the inner disks surrounding the target stars. We find that the angular size of the near-IR emission typically increases with wavelength, indicating hot, presumably gaseous material within the dust sublimation radius. Our data also clearly indicate Brγ emission arising from hot hydrogen gas, and suggest the presence of water vapor and carbon monoxide gas in the inner disks of several objects. This gaseous emission is more compact than the dust continuum emission in all cases. We construct simple physical models of the inner disk and fit them to our data to constrain the spatial distribution and temperature of dust and gas emission components.
circumstellar matter; stars: individual (AS 205, AS 442, DG Tau, MWC 275, MWC 480, MWC 758, MWC 863, MWC 1080, HD 141569, HD 142666, HD 144432, RY Tau, RW Aur, V1295 Aql, VV Ser); stars: pre-main sequence; techniques: interferometric; techniques: spectroscopic
Issue 1 (2009 February 10)
Received 2008 June 22, accepted for publication 2008 September 24
Published 2009 February 19
J. A. Eisner et al. 2009 ApJ 692 309
J. A. Eisner and S. R. Kulkarni 2001 ApJ 550 871
R. L. Akeson et al. 2005 ApJ 622 440
Joan R. Najita et al. 2009 ApJ 691 738
E. Buchlin and M. Velli 2007 ApJ 662 701
B. F. Lane et al. 2007 ApJ 658 520
J. A. Eisner et al. 2003 ApJ 588 360
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Sébastien Galtier and Eric Buchlin 2007 ApJ 656 560
J. A. Eisner and S. R. Kulkarni 2002 ApJ 574 426