Blake, Geoffrey A. and Boogert, A. C. A. (2004) High-Resolution 4.7 Micron Keck/NIRSPEC Spectroscopy of the CO Emission from the Disks Surrounding Herbig Ae Stars. Astrophysical Journal Letters, 606 (1). L73-L76. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20120919-075704620
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We explore the high-resolution (λ/Δλ = 25,000; Δv = 12 km s^(-1)) M-band (4.7-5.1 μm) spectra of several disk-dominated Herbig Ae (HAe) systems: AB Aur, MWC 758, MWC 480, HD 163296, and VV Ser. All five objects show ^(12)CO v = 1-0 emission lines up to J = 42, but there is little or no evidence of moderate-J, v = 2-1 transitions despite their similar excitation energies. AB Aur shows ^(13)CO emission as well. The line/continuum ratios and intensity profiles are well correlated with inclination, and they trace collisionally driven emission from the inner disk (R_(th) ≾ 0.5-1 AU) as well as resonance fluorescence to much larger radii (R_(hν) ≾ 50-100 AU for J ≾ 10). The temperature, density, and radiation field profiles required to fit the CO emission are in good agreement with models of HAe disks derived from their spectral energy distributions. High-resolution and high dynamic range infrared spectroscopy of CO, and future observations of less abundant species, thus provide direct access to the physicochemical properties and surface structure of disks in regions where planet formation likely occurs.
|Additional Information:||© 2004 American Astronomical Society. Received 2003 December 3; accepted 2004 March 18; published 2004 April 8. G. A. B. and A. C. A. B. acknowledge support from the NASA Spitzer Space Telescope and Origins programs. The data presented herein were obtained at the W.M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and NASA. The Observatory was made possible by the generous financial support of the W.M. Keck Foundation.|
|Subject Keywords:||infrared: ISM; ISM: molecules; planetary systems: protoplanetary disks; stars: formation|
|Official Citation:||High-Resolution 4.7 Micron Keck/NIRSPEC Spectroscopy of the CO Emission from the Disks Surrounding Herbig Ae Stars Geoffrey A. Blake and A. C. A. Boogert 2004 ApJ 606 L73|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||19 Sep 2012 15:42|
|Last Modified:||26 Dec 2012 16:12|
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