Abstract
We present Herschel Space Observatory far-IR imaging and spectroscopy of
49 Cet, an unusual circumstellar disk around a nearby young A1V star.
The system is famous for showing the dust properties of a debris disk,
but the gas properties of a low-mass protoplanetary disk. Photometry was
obtained at 70 and 160 microns; 49 Cet is significantly extended in the
70 micron image, spatially resolving the outer dust disk for the first
time. Spectra covering small wavelength ranges centered on eight atomic,
ionic, and molecular emission lines were obtained, including [OI] 63
microns and [CII] 158 microns. The CII line was detected at the
5-σ level; no other emission lines were seen. An estimate of the
amount of circumstellar atomic gas implied by the CII emission is
presented. A simple model of the new SED confirms the two-component
structure of the disk: a warm inner disk and a cold outer disk that
produces most of the observed excess. Finally, we briefly discuss
preliminary thermochemical modeling of the 49 Cet gas and dust disk, and
what the results suggest for the evolutionary status of the material in
this important disk.
| Original language | English |
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| Title of host publication | American Astronomical Society Meeting Abstracts |
| Pages | 205.01 |
| Publication status | Published - Jan-2013 |
| Event | American Astronomical Society, AAS Meeting #221, #205.01 - Long Beach, California, United States Duration: 6-Jan-2013 → 10-Jan-2013 |
Conference
| Conference | American Astronomical Society, AAS Meeting #221, #205.01 |
|---|---|
| Country/Territory | United States |
| City | Long Beach, California |
| Period | 06/01/2013 → 10/01/2013 |