APEX Observations of the CO Envelope around the Young FUor-type Star V883 Ori. (arXiv:1904.07269v1 [astro-ph.EP])

APEX Observations of the CO Envelope around the Young FUor-type Star V883 Ori. (arXiv:1904.07269v1 [astro-ph.EP])
<a href="http://arxiv.org/find/astro-ph/1/au:+White_J/0/1/0/all/0/1">Jacob Aaron White</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kospal_A/0/1/0/all/0/1">&#xc1;. K&#xf3;sp&#xe1;l</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rab_C/0/1/0/all/0/1">C. Rab</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Abraham_P/0/1/0/all/0/1">P. &#xc1;brah&#xe1;m</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Miera_F/0/1/0/all/0/1">F. Cruz-S&#xe1;enz de Miera</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Csengeri_T/0/1/0/all/0/1">T. Csengeri</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Feher_O/0/1/0/all/0/1">O. Feh&#xe9;r</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gusten_R/0/1/0/all/0/1">R. G&#xfc;sten</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Henning_T/0/1/0/all/0/1">T. Henning</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Vorobyov_E/0/1/0/all/0/1">E. Vorobyov</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Audard_M/0/1/0/all/0/1">M. Audard</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Postel_A/0/1/0/all/0/1">A. Postel</a>

The accretion-driven outbursts of young FU Orionis-type stars may be a common
stage of pre-main sequence evolution and can have a significant impact on the
circumstellar environment as it pertains to the growth of solids and eventually
planets. This episodic accretion is thought to be sustained by additional gas
in-falling from the circumstellar envelope and disk. We present APEX
observations of the CO gas in the envelope around V883 Orionis, a young
outbursting star. The observations mapped the $^{12}$CO(4-3), $^{12}$CO(3-2),
and $^{13}$CO(3-2) lines with the FLASH$^{+}$ instrument and the $^{12}$CO(6-5)
line with the SEPIA instrument. We detected high signal-to-noise emission
extending out to radii $>10000$ au and calculated integrated fluxes of
$1100~rm Jy~km~s^{-1}$ for $^{12}$CO(6-5), $2400~rm Jy~km~s^{-1}$ for
$^{12}$CO(4-3), $1600~rm Jy~km~s^{-1}$ for $^{12}$CO(3-2), and $450~rm
Jy~km~s^{-1}$ for $^{13}$CO(3-2). We used the thermo-chemical code P{small
RO}D{small I}M{small O} to test several models and find the data are best
described by an envelope structure with $rm M_{env}approx 0.2-0.4,M_{odot}$
and a mass-infall rate of $rm
dot{M}_{inf}=1-2times10^{-6},M_{odot},yr^{-1}$. We infer that the observed
envelope and outflow structure around V883 Ori could be caused by multiple
outbursts, consistent with episodic accretion.

The accretion-driven outbursts of young FU Orionis-type stars may be a common
stage of pre-main sequence evolution and can have a significant impact on the
circumstellar environment as it pertains to the growth of solids and eventually
planets. This episodic accretion is thought to be sustained by additional gas
in-falling from the circumstellar envelope and disk. We present APEX
observations of the CO gas in the envelope around V883 Orionis, a young
outbursting star. The observations mapped the $^{12}$CO(4-3), $^{12}$CO(3-2),
and $^{13}$CO(3-2) lines with the FLASH$^{+}$ instrument and the $^{12}$CO(6-5)
line with the SEPIA instrument. We detected high signal-to-noise emission
extending out to radii $>10000$ au and calculated integrated fluxes of
$1100~rm Jy~km~s^{-1}$ for $^{12}$CO(6-5), $2400~rm Jy~km~s^{-1}$ for
$^{12}$CO(4-3), $1600~rm Jy~km~s^{-1}$ for $^{12}$CO(3-2), and $450~rm
Jy~km~s^{-1}$ for $^{13}$CO(3-2). We used the thermo-chemical code P{small
RO}D{small I}M{small O} to test several models and find the data are best
described by an envelope structure with $rm M_{env}approx 0.2-0.4,M_{odot}$
and a mass-infall rate of $rm
dot{M}_{inf}=1-2times10^{-6},M_{odot},yr^{-1}$. We infer that the observed
envelope and outflow structure around V883 Ori could be caused by multiple
outbursts, consistent with episodic accretion.

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