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The Northern arc of Eridani’s Debris Ring as seen by ALMA

Booth, Mark, Dent, William R. F., Jordán, Andrés, Lestrade, Jean-François, Hales, Antonio S., Wyatt, Mark C., Casassus, Simon, Ertel, Steve, Greaves, Jane, Kennedy, Grant M., Matrà, Luca, Augereau, Jean-Charles and Villard, Eric 2017. The Northern arc of Eridani’s Debris Ring as seen by ALMA. Monthly Notices of the Royal Astronomical Society 469 (3) , pp. 3200-3212. 10.1093/mnras/stx1072

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Abstract

We present the first Atacama Large Millimeter/submillimeter Array (ALMA) observations of the closest known extrasolar debris disc. This disc orbits the star Eri, a K-type star just 3.2 pc away. Due to the proximity of the star, the entire disc cannot fit within the ALMA field of view. Therefore, the observations have been centred 18 North of the star, providing us with a clear detection of the Northern arc of the ring, at a wavelength of 1.3 mm. The observed disc emission is found to be narrow with a width of just 11–13 AU. The fractional disc width we find is comparable to that of the Solar system’s Kuiper Belt and makes this one of the narrowest debris discs known. If the inner and outer edges are due to resonances with a planet then this planet likely has a semi-major axis of 48 AU. We find tentative evidence for clumps in the ring, although there is a strong chance that at least one is a background galaxy. We confirm, at much higher significance, the previous detection of an unresolved emission at the star that is above the level of the photosphere and attribute this excess to stellar chromospheric emission.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 9 November 2017
Date of Acceptance: 2 May 2017
Last Modified: 09 Nov 2017 15:37
URI: http://orca-mwe.cf.ac.uk/id/eprint/106383

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