Extreme conditions in a close analog to the young solar system : Herschel observations of ∈ Eridani
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Far-infrared Herschel images of the 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 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 Eri b, at semi-major axis ≈3 AU.
Greaves , J S , 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 , W K , Harvey , P M , Hogerheijde , M R , Holland , W S , Ivison , R J , Liseau , R , Matthews , B C , Pilbratt , G L , Walker , H J & Waelkens , C 2014 , ' Extreme conditions in a close analog to the young solar system : Herschel observations of ∈ Eridani ' Astrophysical Journal Letters , vol 791 , no. 1 . DOI: 10.1088/2041-8205/791/1/L11
Astrophysical Journal Letters
Copyright 2014. The American Astronomical Society. All rights reserved. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at http://dx.doi.org/10.1088/2041-8205/791/1/L11