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The Nearby Evolved Stars Survey: I. JCMT/SCUBA-2 Sub-millimetre detection of the detached shell of U Antliae

Dharmawardena, Thavisha E., Kemper, Francisca, Srinivasan, Sundar, Scicluna, Peter, Marshall, Jonathan P., Wouterloot, Jan G. A., Greaves, Jane, Goldman, , Th. van Loon, , Matsuura, Mikako, McDonald, Iain, He, Jinhua, Zijlstra, Albert A., Toalá, Jesús A., Wallström, Sofia H. J., Kim, Hyosun, Trejo, Alfonso, Ventura, Paolo, Lagadec, Eric, Boyer, Martha L., Liu, Tie, Rau, Gioia, Izumiura, Hideyuki, Cami, Jan, Holland, Wayne, Jones, Olivia and Shinnaga, Hiroko 2019. The Nearby Evolved Stars Survey: I. JCMT/SCUBA-2 Sub-millimetre detection of the detached shell of U Antliae. Monthly Notices of the Royal Astronomical Society , -. 10.1093/mnras/stz2334

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Abstract

We present the highest resolution single-dish submillimetre observations of the detached shell source U Antliae to date. The observations were obtained at 450 μm 450 μm and 850 μm 850 μm with SCUBA-2 instrument on the James Clerk Maxwell Telescope as part of the Nearby Evolved Stars Survey. The emission at 850 μm 850 μm peaks at 40″ with hints of a second peak seen at ∼20″. The emission can be traced out to a radius of 56″ at a 3σ level. The outer peak observed at 850 μm 850 μm aligns well with the peak observed at Herschel/PACS wavelengths. With the help of spectral energy distribution fitting and radiative transfer calculations of multiple-shell models for the circumstellar envelope, we explore the various shell structures and the variation of grain sizes along the in the circumstellar envelope. We determine a total shell dust mass of (2.0 ± 0.3) × 10−5 M⊙ and established that the thermal pulse which gave rise to the detached shell occurred 3500 ± 500 years ago.

Item Type: Article
Date Type: Published Online
Status: In Press
Schools: Physics and Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 21 August 2019
Date of Acceptance: 5 August 2019
Last Modified: 19 Oct 2019 22:38
URI: http://orca-mwe.cf.ac.uk/id/eprint/125054

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