SIMBAD references

2017ApJ...839L..14H - Astrophys. J., 839, L14-L14 (2017/April-2)

Detection of submillimeter-wave [C I] emission in gaseous debris disks of 49 Ceti and β Pictoris.

HIGUCHI A.E., SATO A., TSUKAGOSHI T., SAKAI N., IWASAKI K., MOMOSE M., KOBAYASHI H., ISHIHARA D., WATANABE S., KANEDA H. and YAMAMOTO S.

Abstract (from CDS):

We have detected [C i] 3P1-3P0 emissions in the gaseous debris disks of 49 Ceti and β Pictoris with the 10 m telescope of the Atacama Submillimeter Telescope Experiment, which is the first detection of such emissions. The line profiles of [C i] are found to resemble those of CO(J = 3-2) observed with the same telescope and the Atacama Large Millimeter/submillimeter Array. This result suggests that atomic carbon (C) coexists with CO in the debris disks and is likely formed by the photodissociation of CO. Assuming an optically thin [C i] emission with the excitation temperature ranging from 30 to 100 K, the column density of C is evaluated to be (2.2 ± 0.2) x 1017 and (2.5 ± 0.7) x 1016 cm–2 for 49 Ceti and β Pictoris, respectively. The C/CO column density ratio is thus derived to be 54 ± 19 and 69 ± 42 for 49 Ceti and β Pictoris, respectively. These ratios are higher than those of molecular clouds and diffuse clouds by an order of magnitude. The unusually high ratios of C to CO are likely attributed to a lack of H2 molecules needed to reproduce CO molecules efficiently from C. This result implies a small number of H2 molecules in the gas disk, i.e., there is an appreciable contribution of secondary gas from dust grains.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): ISM: atoms - ISM: molecules - planets and satellites: general - protoplanetary disks - protoplanetary disks

Simbad objects: 19

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2019.10.17-03:42:40

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