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Hd 98800: a 10-myr-old Transition Disk
| Content Provider | Semantic Scholar |
|---|---|
| Author | Sargent, Ben Calvet, Nuria Alessio, Paola D’ Hartmann, Lee Green, Joel Chen, Christine H-T |
| Copyright Year | 2007 |
| Abstract | We present the mid-infrared spectrum, obtained with the Spitzer Infrared Spectrograph (IRS), of HD 98800, a quadruple star system located in the 10-Myr-old TW Hydrae association. It has a known mid-infrared excess that arises from a circumbinary disk around the B components of the system. The IRS spectrum confirms that the disk around HD 98800 B displays no excess emission below about 5.5 μm, implying an optically thick disk wall at 5.9 AU and an inner, cleared-out region; however, some optically thin dust, consisting mainly of 3-μm-sized silicate dust grains, orbits the binary in a ring between 1.5 and 2 AU. The peculiar structure and apparent lack of gas in the HD 98800 B disk suggests that this system is likely already at the debris disks stage, with a tidally truncated circumbinary disk of larger dust particles and an inner, second-generation dust ring, possibly held up by the resonances of a planet. The unusually large infrared excess can be explained by gravitational perturbations of the Aa+Ab pair puffing up the outer dust ring and causing frequent collisions among the larger particles. Subject headings: circumstellar matter — binaries: close — stars: individual (HD 98800) — planetary systems: formation — infrared: stars |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://arxiv.org/pdf/0705.0380v1.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | GUCY2C protein, human Gold Infrared Science Archive Large Mahdiyar Medical Subject Headings Ocular orbit Offset binary Planetary scanner Quadruple-precision floating-point format Silicates Spectroscopy, Near-Infrared Stars, Celestial collision |
| Content Type | Text |
| Resource Type | Article |
