The Nearby Evolved Stars Survey: I. JCMT/SCUBA-2 Sub-millimetre detection of the detached shell of U Antliae. (arXiv:1908.04575v1 [astro-ph.SR])

The Nearby Evolved Stars Survey: I. JCMT/SCUBA-2 Sub-millimetre detection of the detached shell of U Antliae. (arXiv:1908.04575v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Dharmawardena_T/0/1/0/all/0/1">Thavisha E. Dharmawardena</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kemper_F/0/1/0/all/0/1">Francisca Kemper</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Srinivasan_S/0/1/0/all/0/1">Sundar Srinivasan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Scicluna_P/0/1/0/all/0/1">Peter Scicluna</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Marshall_J/0/1/0/all/0/1">Jonathan P. Marshall</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wouterloot_J/0/1/0/all/0/1">Jan G. A. Wouterloot</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Greaves_J/0/1/0/all/0/1">Jane Greaves</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Goldman_S/0/1/0/all/0/1">Steven R. Goldman</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Loon_J/0/1/0/all/0/1">Jacco Th. van Loon</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Matsuura_M/0/1/0/all/0/1">Mikako Matsuura</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+McDonald_I/0/1/0/all/0/1">Iain McDonald</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+He_J/0/1/0/all/0/1">Jinhua He</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zijlstra_A/0/1/0/all/0/1">Albert A. Zijlstra</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Toala_J/0/1/0/all/0/1">Jes&#xfa;s A. Toal&#xe1;</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wallstrom_S/0/1/0/all/0/1">Sofia H. J. Wallstr&#xf6;m</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kim_H/0/1/0/all/0/1">Hyosun Kim</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Trejo_A/0/1/0/all/0/1">Alfonso Trejo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ventura_P/0/1/0/all/0/1">Paolo Ventura</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lagadec_E/0/1/0/all/0/1">Eric Lagadec</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Boyer_M/0/1/0/all/0/1">Martha L. Boyer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Liu_T/0/1/0/all/0/1">Tie Liu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rau_G/0/1/0/all/0/1">Gioia Rau</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Izumiura_H/0/1/0/all/0/1">Hideyuki Izumiura</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cami_J/0/1/0/all/0/1">Jan Cami</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Holland_W/0/1/0/all/0/1">Wayne Holland</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Jones_O/0/1/0/all/0/1">Olivia Jones</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Shinnaga_H/0/1/0/all/0/1">Hiroko Shinnaga</a>

We present the highest resolution single-dish submillimetre observations of
the detached shell source U Antliae to date. The observations were obtained at
$450~micron$ and $850~micron$ with SCUBA-2 instrument on the James Clerk
Maxwell Telescope as part of the Nearby Evolved Stars Survey. The emission at
$850~micron$ peaks at $40arcsec$ with hints of a second peak seen at $sim
20arcsec$. The emission can be traced out to a radius of $56arcsec$ at a
$3sigma$ level. The outer peak observed at $850~micron$ 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 $(2.0 pm 0.3) times 10^{-5}$ M$_{odot}$
and established that the thermal pulse which gave rise to the detached shell
occurred 3500 $pm$ 500 years ago.

We present the highest resolution single-dish submillimetre observations of
the detached shell source U Antliae to date. The observations were obtained at
$450~micron$ and $850~micron$ with SCUBA-2 instrument on the James Clerk
Maxwell Telescope as part of the Nearby Evolved Stars Survey. The emission at
$850~micron$ peaks at $40arcsec$ with hints of a second peak seen at $sim
20arcsec$. The emission can be traced out to a radius of $56arcsec$ at a
$3sigma$ level. The outer peak observed at $850~micron$ 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 $(2.0 pm 0.3) times 10^{-5}$ M$_{odot}$
and established that the thermal pulse which gave rise to the detached shell
occurred 3500 $pm$ 500 years ago.

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