Detection of Rare CO Isotopologues in Protostellar Disks Using CRIRES and NIRSPEC

Details Detection of Rare CO Isotopologues in Protostellar Disks Using CRIRES and NIRSPEC Detection of Rare CO Isotopologues in Protostellar Disks Using CRIRES and NIRSPEC

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5001s&link_type=abstract

American Astronomical Society, AAS Meeting #211, #50.01; Bulletin of the American Astronomical Society, Vol. 39, p.811

Astronomy and Astrophysics

Astronomy

Scientific paper

We report detection of four CO isotopologues in a circumstellar disk, C16O,13CO and C18O and the exceedingly rare species, C17O. High-resolution 4.7 μm fundamental and 2.3 μm overtone ro-vibrational absorption bands of CO were obtained for the disk surrounding the southern pre-main sequence YSO VV CrA (d 170 pc) using CRIRES on the VLT Antu telescope at ESO's Paranal Observatory. The spectra were collected at R = λ/Δλ 100,000 and with a relatively long integration time ( 30 minutes). All CO line profiles are resolved (FWHM 3.8 km/s), permitting a direct calculation of oxygen isotope ratios in the disk and offsetting many of the uncertainties inherent in analyzing optically thick and poorly resolved lines. Preliminary results suggest ratios similar to the local ISM: 16O/18O 800, 16O/17O 2700, and 18O/17O 3.4, and an average integrated temperature of 100 K. Analysis of these new data is ongoing at the time of this writing; we expect the CRIRES results to be well-constrained due to the superior quality of the spectral lines. We compare these data with our earlier analysis of the 4.7 μm CO band for the massive YSO IRAS 19110+1045 (d 6 kpc) using NIRSPEC (R = λ/Δλ 25,000) at the Keck II telescope: 16O/18O = 450 +/- 30 (1σ, standard error from the curve of growth fit); 16O/17O = 1800 +/- 740; and 18O/17O = 4.0 +/- 1.7. The lines for IRAS 19110+1045 were unresolved, and the systematic errors were large. Accurate oxygen isotope ratios in circumstellar disks surrounding YSOs such as VV CrA are of particular interest for understanding the anomalous distribution of oxygen isotopes in primitive solar system materials and the apparently peculiar 18O/17O ratio of the solar system relative to its local galactic neighborhood.

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