Greaves, JS;
Sibthorpe, B;
Acke, B;
Pantin, EE;
Vandenbussche, B;
Olofsson, G;
Dominik, C;
... Waelkens, C; + view all
(2014)
Extreme conditions in a close analog to the young Solar System: Herschel observations of ϵ Eridani.
The Astrophysical Journal Letters
, 791
(1)
, Article 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.
| Type: | Article |
|---|---|
| Title: | Extreme conditions in a close analog to the young Solar System: Herschel observations of ϵ Eridani |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1088/2041-8205/791/1/L11 |
| Publisher version: | https://doi.org/10.1088/2041-8205/791/1/L11 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | circumstellar matter; planet-disk interactions; stars: individual (epsilon Eridani) |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10093767 |
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