Debris discs around nearby solar analogues |
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| Authors: | J S Greaves M C Wyatt G Bryden |
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| Institution: | SUPA, Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS;Institute of Astronomy, University of Cambridge, Cambridge CB3 0HA;Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA |
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| Abstract: | An unbiased search for debris discs around nearby Sun-like stars is reported. 13 G-dwarfs at 12–15 parsec distance were searched at 850 μm wavelength, and a disc is confirmed around HD 30495. The estimated dust mass is 0.008 M⊕ with a net limit ?0.0025 M⊕ for the average disc of the other stars. The results suggest there is not a large missed population of substantial cold discs around Sun-like stars – HD 30495 is a bright rather than unusually cool disc, and may belong to a few hundred Myr old population of greater dust luminosity. The far-infrared and millimetre survey data for Sun-like stars are well fitted by either steady state or stirred models, provided that typical comet belts are comparable in size to that in the Solar system. |
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| Keywords: | circumstellar matter planetary systems: formation |
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