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Extreme conditions in a close analog to the young solar system:herschelobservations of epsilon Eridani

Greaves, Jane, Sibthorpe, B., Acke, B., Pantin, E. E., Vandenbussche, B., Olofsson, G., Dominik, C., Barlow, M. J., Bendo, G. J., Blommaert, J. A. D. L., Brandeker, A., de Vries, B. L., Dent, W. R. F., Di Francesco, J., Fridlund, M., Gear, Walter Kieran, Harvey, P. M., Hogerheijde, M. R., Holland, W. S., Ivison, R. J., Liseau, R., Matthews, B. C., Pilbratt, G. L., Walker, H. J. and Waelkens, C. 2014. Extreme conditions in a close analog to the young solar system:herschelobservations of epsilon Eridani. Astrophysical Journal Letters 791 (1) , L11. 10.1088/2041-8205/791/1/L11

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Abstract

Far-infrared Herschel images of the epsilon Eridani system, seen at a fifth of the Sun's present age, resolve two belts of debris emission. Fits to the 160 μm PACS image yield radial spans for these belts of 12-16 and 54-68 AU. The south end of the outer belt is ≈10% brighter than the north end in the PACS+SPIRE images at 160, 250, and 350 μm, indicating a pericenter glow attributable to a planet "c." From this asymmetry and an upper bound on the offset of the belt center, this second planet should be mildly eccentric (ec ≈ 0.03-0.3). Compared to the asteroid and Kuiper Belts of the young Sun, the epsilon Eri belts are intermediate in brightness and more similar to each other, with up to 20 km sized collisional fragments in the inner belt totaling ≈5% of an Earth mass. This reservoir may feed the hot dust close to the star and could send many impactors through the Habitable Zone, especially if it is being perturbed by the suspected planet epsilon Eri b, at semi-major axis ≈3 AU.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: American Astronomical Society
ISSN: 2041-8213
Date of Acceptance: 7 July 2014
Last Modified: 21 Feb 2019 15:34
URI: http://orca.cf.ac.uk/id/eprint/89717

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