Protostars and Planets VI, Heidelberg, July 15-20, 2013

Poster 2S017

Spectro-Astrometry of Molecular Emission in DR Tauri

Brown, Logan (University of Missouri - St. Louis)
Troutman, Matthew (University of Missouri - St. Louis)
Gibb, Erika (University of Missouri - St. Louis)

To understand how life originated on Earth, we must investigate how the necessary water and other prebiotic molecules were distributed through the protoplanetary disk from which the solar system formed. To infer this, we study analogs to the early solar system: T Tauri stars. These objects are low-mass, pre-main sequence stars surrounded by circumstellar disks of material from which planets are believed to form. How water is distributed through a protoplanetary disk is of particular interest. We present high-resolution, near-infrared spectro-astrometric data for the T Tauri star DR Tau using NIRSPEC at the Keck II telescope. Spectro-astrometry obtains sub-seeing spatial information from emission lines originating in a non-point source object, such as a circumstellar disk. We report the first detection of water spectro-astrometric signatures in a protoplanetary disk. Three water features near 3 μm were averaged together to produce the total signal analyzed. Using a disk model, we constrained the position angle of the disk (~140o), the inclination of the disk (~13o), and the emitting region of the water emission lines (~0.056 - 0.38 AU). Further more, we attempted to constrain the emitting region for observed OH emission.

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