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

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  • Thavisha E Dharmawardena
    Academia Sinica Institute of Astronomy and Astrophysics, 11F of AS/NTU Astronomy-Mathematics Building, No.1, Section 4, Roosevelt Rd, Taipei 10617, Taiwan
  • Francisca Kemper
    Academia Sinica Institute of Astronomy and Astrophysics, 11F of AS/NTU Astronomy-Mathematics Building, No.1, Section 4, Roosevelt Rd, Taipei 10617, Taiwan
  • Sundar Srinivasan
    Academia Sinica Institute of Astronomy and Astrophysics, 11F of AS/NTU Astronomy-Mathematics Building, No.1, Section 4, Roosevelt Rd, Taipei 10617, Taiwan
  • Peter Scicluna
    Academia Sinica Institute of Astronomy and Astrophysics, 11F of AS/NTU Astronomy-Mathematics Building, No.1, Section 4, Roosevelt Rd, Taipei 10617, Taiwan
  • Jonathan P Marshall
    Academia Sinica Institute of Astronomy and Astrophysics, 11F of AS/NTU Astronomy-Mathematics Building, No.1, Section 4, Roosevelt Rd, Taipei 10617, Taiwan
  • Jan G A Wouterloot
    East Asian Observatory, 660 N A’ohoku Place, Hilo, HI 96720, USA
  • Jane Greaves
    School of Physics and Astronomy, Cardiff University, 4 The Parade, Cardiff CF24 3AA, UK
  • Steven R Goldman
    STScI, 3700 San Martin Drive, Baltimore, MD 21218, USA
  • Jacco Th van Loon
    Lennard-Jones Laboratories, Keele University, Keele, Staffordshire ST5 5BG, UK
  • Mikako Matsuura
    School of Physics and Astronomy, Cardiff University, 4 The Parade, Cardiff CF24 3AA, UK
  • Iain McDonald
    Jodrell Bank Centre for Astrophysics, Alan Turing Building, University of Manchester, Manchester M13 9PL, UK
  • Jinhua He
    Key Laboratory for the Structure and Evolution of Celestial Objects, Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216, P. R. China
  • Albert A Zijlstra
    Jodrell Bank Centre for Astrophysics, Alan Turing Building, University of Manchester, Manchester M13 9PL, UK
  • Jesús A Toalá
    Instituto de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, Antigua Carretera a Pátzcuaro # 8701, Ex-Hda. San José de la Huerta, Morelia, Michoacán, México C.P. 58089, México
  • Sofia H J Wallström
    Academia Sinica Institute of Astronomy and Astrophysics, 11F of AS/NTU Astronomy-Mathematics Building, No.1, Section 4, Roosevelt Rd, Taipei 10617, Taiwan
  • Hyosun Kim
    Korea Astronomy and Space Science Institute, 776, Daedukdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea
  • Alfonso Trejo
    Academia Sinica Institute of Astronomy and Astrophysics, 11F of AS/NTU Astronomy-Mathematics Building, No.1, Section 4, Roosevelt Rd, Taipei 10617, Taiwan
  • Paolo Ventura
    INAF, Osservatorio Astronomico di Roma, Via Frascati 33, Monte Porzio Catone, I-00077 Roma, Italy
  • Eric Lagadec
    Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Lagrange, France
  • Martha L Boyer
    STScI, 3700 San Martin Drive, Baltimore, MD 21218, USA
  • Tie Liu
    East Asian Observatory, 660 N A’ohoku Place, Hilo, HI 96720, USA
  • Gioia Rau
    NASA/GSFC, Code 667, Goddard Space Flight Center, Greenbelt, MD 20071, USA
  • Hideyuki Izumiura
    Okayama Branch Office, Subaru Telescope, NAOJ, NINS 3037-5 Honjo, Kamogata, Asakuchi, Okayama 719-0232, Japan
  • Jan Cami
    Department of Physics and Astronomy and Centre for Planetary Science and Exploration (CPSX), The University of Western Ontario, London, ON N6A 3K7, Canada
  • Wayne Holland
    UK Astronomy Technology Centre, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
  • Olivia Jones
    UK Astronomy Technology Centre, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
  • Hiroko Shinnaga
    Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima University 1-21-35 Korimoto, Kagoshima 890-0065, Japan

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<jats:title>ABSTRACT</jats:title> <jats:p>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 $850\,{\mu}{\rm m}$ with SCUBA-2 instrument on the James Clerk Maxwell Telescope as part of the Nearby Evolved Stars Survey. The emission at $850\,{\mu}{\rm m}$ 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 3σ level. The outer peak observed at $850\,{\mu}{\rm m}$ 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.</jats:p>

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