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The nearby evolved stars survey – I. JCMT/SCUBA-2 submillimetre detection of the detached shell of U Antliae

van Loon, Jacco Th

The nearby evolved stars survey – I. JCMT/SCUBA-2 submillimetre detection of the detached shell of U Antliae Thumbnail


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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 $450$ and $850\,µ\rm m$ with SCUBA-2 instrument on the James Clerk Maxwell Telescope as part of the Nearby Evolved Stars Survey. The emission at $850\,µ\rm m$ peaks at 40 arcsec with hints of a second peak seen at ~20 arcsec. The emission can be traced out to a radius of 56 arcsec at a 3s level. The outer peak observed at $850\,µ\rm m$ 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 that gave rise to the detached shell occurred 3500 ± 500 yr ago.

Acceptance Date Aug 5, 2019
Publication Date Nov 1, 2019
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Pages 3218 -3231
DOI https://doi.org/10.1093/mnras/stz2334
Keywords stars: AGB and post-AGB – stars: circumstellar matter – stars: massloss – stars: individual: U Ant
Publisher URL https://doi.org/10.1093/mnras/stz2334

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