The cold origin of the warm dust around ε Eridani

Context. The nearby K2 V star ε Eridani hosts one known inner planet, an outer Kuiper belt analog, and an inner disk of warm dust. Spitzer/IRS measurements indicate that the warm dust is present at distances as close as a few AU from the star. Its origin is puzzling, since an “asteroid belt” that co...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2011-03, Vol.527, p.A57
Main Authors: Reidemeister, M., Krivov, A. V., Stark, C. C., Augereau, J.-C., Löhne, T., Müller, S.
Format: Article
Language:English
Subjects:
Astronomy
circumstellar matter
Earth, ocean, space
Exact sciences and technology
planet-disk interactions
planets and satellites: formation
stars: individual:εEridani
zodiacal dust
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Summary:Context. The nearby K2 V star ε Eridani hosts one known inner planet, an outer Kuiper belt analog, and an inner disk of warm dust. Spitzer/IRS measurements indicate that the warm dust is present at distances as close as a few AU from the star. Its origin is puzzling, since an “asteroid belt” that could produce this dust would be unstable because of the known inner planet. Aims. Here we test a hypothesis that the observed warm dust is generated by collisions in the outer belt and is transported inward by Poynting-Robertson drag and strong stellar winds. Methods. We simulated a steady-state distribution of dust particles outside 10   AU with a collisional code and in the inner region (r 
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361/201015328