High-Resolution 4.7 Micron Keck/NIRSPEC Spectroscopy of the CO Emission from the Disks Surrounding Herbig Ae Stars

Details High-Resolution 4.7 Micron Keck/NIRSPEC Spectroscopy of the CO Emission from the Disks Surrounding Herbig Ae Stars High-Resolution 4.7 Micron Keck/NIRSPEC Spectroscopy of the CO Emission from the Disks Surrounding Herbig Ae Stars

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...606l..73b&link_type=abstract

The Astrophysical Journal, Volume 606, Issue 1, pp. L73-L76.

Astronomy and Astrophysics

Astronomy

69

Infrared: Ism, Ism: Molecules, Stars: Planetary Systems: Protoplanetary Disks, Stars: Formation

Scientific paper

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 12CO 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 13CO 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 (Rth<~0.5-1 AU) as well as resonance fluorescence to much larger radii (Rhν<~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.

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