Extreme conditions in a close analog to the young solar system : Herschel observations of ε Eridani

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DOIResolve DOI: http://doi.org/10.1088/2041-8205/791/1/L11
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TypeArticle
Journal titleThe Astrophysical Journal Letters
ISSN2041-8205
Volume791
Issue1
Article numberL11
Pages15; # of pages: 5
Subjectcircumstellar matter: planet–disk interactions; stars: individual (ε Eridani)
AbstractFar-infrared Herschel images of the ε 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 ε 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 ε Eri b, at semi-major axis ≈3 AU.
Publication date
LanguageEnglish
AffiliationNational Science Infrastructure; National Research Council Canada
Peer reviewedYes
NPARC number21272700
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Record identifier19dd5a04-660f-430b-a95d-8c13b92cc800
Record created2014-12-03
Record modified2016-07-18
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