Fujiwara, H.; Ishihara, D.; Onaka, T.; Takita, S.; Kataza, H.; Yamashita, T.; Fukagawa, M.; Ootsubo, T.; Hirao, T.; Enya, K.; Marshall, J. P.; White, G. J.; Nakagawa, T. and Murakami, H.
(2013).
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| DOI (Digital Object Identifier) Link: | https://doi.org/10.1051/0004-6361/201219841 |
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| Google Scholar: | Look up in Google Scholar |
Abstract
Context. Little is known about the properties of the warm (Tdust ≳ 150 K) debris disk material located close to the central star, which has a more direct link to the formation of terrestrial planets than does the low-temperature debris dust that has been detected to date.
Aims: To discover new warm debris disk candidates that show large 18 μm excess and estimate the fraction of stars with excess based on the AKARI/IRC Mid-Infrared All-Sky Survey data.
Methods: We searched for point sources detected in the AKARI/IRC All-Sky Survey, which show a positional match with A-M dwarf stars in the Tycho-2 Spectral Type Catalogue and exhibit excess emission at 18 μm compared to what is expected from the KS magnitude in the 2MASS catalogue.
Results: We find 24 warm debris candidates including 8 new candidates among A-K stars. The apparent debris disk frequency is estimated to be 2.8 ± 0.6%. We also find that A stars and solar-type FGK stars have different characteristics of the inner component of the identified debris disk candidates. While debris disks around A stars are cooler and consistent with steady-state evolutionary model of debris disks, those around FGK stars tend to be warmer and cannot be explained by the steady-state model.
| Item Type: | Journal Item |
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| Copyright Holders: | 2013 ESO |
| ISSN: | 1432-0746 |
| Extra Information: | 15 pp. |
| Keywords: | circumstellar matter; zodiacal dust; infrared stars |
| Academic Unit/School: | Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences Faculty of Science, Technology, Engineering and Mathematics (STEM) |
| Item ID: | 36483 |
| Depositing User: | G. J. White |
| Date Deposited: | 04 Feb 2013 10:25 |
| Last Modified: | 08 Dec 2018 04:31 |
| URI: | http://oro.open.ac.uk/id/eprint/36483 |
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