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AKARI/IRC 18 μm survey of warm debris disks

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). AKARI/IRC 18 μm survey of warm debris disks. Astronomy & Astrophysics, 550, article no. A45.

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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
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
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