Loading...
Please wait, while we are loading the content...
Similar Documents
Herschel observations of gas and dust in the unusual 49 ceti debris disk
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Kamp, I. Olofsson, J. Sandell, G. Woitke, P. Dent, W. R. F. Montesinos, B. Donaldson, J. K. Ardila, D. R. Moor, A. Eiroa, C. Meeus, G. Augereau, J.-C. Howard, C. Thi, W.-F. Roberge, A. |
| Copyright Year | 2013 |
| Description | We present far-IR/sub-mm imaging and spectroscopy of 49 Ceti, 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. The data were acquired with the Herschel Space Observatory PACS and SPIRE||||instruments, largely as part of the âGas in Protoplanetary Systemsâ (GASPS) Open Time Key Programme. Disk||||dust emission is detected in images at 70, 160, 250, 350, and 500 micron; 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 and molecular emission lines were obtained, including [O i] 63 micron and [C ii] 158 micron. The C ii line||||was detected at the 5 sigma levelâthe first detection of atomic emission from the disk. No other emission lines were||||seen, despite the fact that the Oi line is the brightest one observed in Herschel protoplanetary disk spectra. We||||present an estimate of the amount of circumstellar atomic gas implied by the C ii emission. The new far-IR/sub-mm||||data fills in a large gap in the previous spectral energy distribution (SED) of 49 Cet. A simple model of the new||||SED confirms the two-component structure of the disk: warm inner dust and cold outer dust that produces most of||||the observed excess. Finally, we discuss preliminary thermochemical modeling of the 49 Cet gas/dust disk and our||||attempts to match several observational results simultaneously. Although we are not yet successful in doing so, our||||investigations shed light on the evolutionary status of the 49 Cet gas, which might not be primordial gas but rather||||secondary gas coming from comets. |
| File Size | 292802 |
| Page Count | 10 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20140009145 |
| Archival Resource Key | ark:/13960/t9r25z154 |
| Language | English |
| Publisher Date | 2013-06-17 |
| Access Restriction | Open |
| Subject Keyword | Thermochemical Modeling Circumstellar Atomic Gas Spectroscopy Far Infrared Radiation Stellar Envelopes Thermochemistry Infrared Sources Astronomy Protoplanetary Disks Main Sequence Stars Stellar Evolution Infrared Astronomy Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
