A Detection of OH in the Planet Formation Regions of Circumstellar Disks

Details A Detection of OH in the Planet Formation Regions of Circumstellar Disks A Detection of OH in the Planet Formation Regions of Circumstellar Disks

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.1002s&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #10.02; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

Detecting new molecular species in young circumstellar disks will allow us to constrain the abundances and thermodynamics of the gas chemistry critical to understanding the origins of planetary systems. NIR observations are just beginning to probe the detailed chemistry of the warm gas in circumstellar disks around young stars, detecting CO ro-vibrational emission, hot H2O, organics and warm H2 emission. Modeling of these disks suggests that additional molecular species such as OH may be abundant and detectable. We acquired spectroscopic observations of several nearly face-on Herbig Ae/Be stars and T Tauri stars in the 3.0 3.7 µm wavelength range (L-band) using the NIRSPEC instrument on Keck II. This region samples lowand high-J transitions of OH and water hot-bands, as well as transitions of methane and ethane. Preliminary reductions reveal tentative detections of emission lines from a low-J OH doublet in the Herbig Ae stars AB Aurigae and MWC 758. Line shapes match those of low-J CO, suggesting the emission originates in the outer regions of the disk. If confirmed, analysis of these transitions can provide new constraints on the water vapor abundance, distribution and temperature in these young protoplanetary disks.

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