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Rings and gaps in the disc around Elias 24 revealed by ALMA

Dipierro, G, Ricci, L, Pérez, L, Lodato, G, Alexander, R D, Laibe, G, Andrews, S, Carpenter, J M, Chandler, C J, Greaves, Jane, Hall, C, Henning, T, Kwon, W, Linz, H, Mundy, L, Sargent, A, Tazzari, M, Testi, L and Wilner, D 2018. Rings and gaps in the disc around Elias 24 revealed by ALMA. Monthly Notices of the Royal Astronomical Society 475 (4) , pp. 5296-5312. 10.1093/mnras/sty181

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Abstract

We present Atacama Large Millimeter/sub-millimeter Array (ALMA) Cycle 2 observations of the 1.3 mm dust continuum emission of the protoplanetary disc surrounding the T Tauri star Elias 24 with an angular resolution of ∼0.2″ (∼28 au). The dust continuum emission map reveals a dark ring at a radial distance of 0.47″ (∼65 au) from the central star, surrounded by a bright ring at 0.58″ (∼81 au). In the outer disc, the radial intensity profile shows two inflection points at 0.71″ and 0.87″ (∼99 and 121 au respectively). We perform global three-dimensional smoothed particle hydrodynamic gas/dust simulations of discs hosting a migrating and accreting planet. Combining the dust density maps of small and large grains with three dimensional radiative transfer calculations, we produce synthetic ALMA observations of a variety of disc models in order to reproduce the gap- and ring-like features observed in Elias 24. We find that the dust emission across the disc is consistent with the presence of an embedded planet with a mass of ∼0.7MJ at an orbital radius of ∼ 60 au. Our model suggests that the two inflection points in the radial intensity profile are due to the inward radial motion of large dust grains from the outer disc. The surface brightness map of our disc model provides a reasonable match to the gap- and ring-like structures observed in Elias 24, with an average discrepancy of ∼ 5% of the observed fluxes around the gap region.

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: 14 February 2018
Date of Acceptance: 19 January 2018
Last Modified: 05 Jun 2018 12:19
URI: http://orca-mwe.cf.ac.uk/id/eprint/109090

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