DECaPS and SMA discovery of a highly-inclined class I YSO with an outflow: IRAS 08235-4316

TL;DR

This paper reports the discovery of a highly-inclined class I young stellar object with an outflow and a large protoplanetary disk, using multi-wavelength imaging and spectral data, revealing its structure, dynamics, and estimated physical properties.

Contribution

It presents the first identification of a class I YSO with an outflow and a large, embedded disk, characterized through combined optical, submillimeter, and spectral observations.

Findings

Asymmetric bipolar morphology with a dark lane indicating a highly-inclined disk

Detection of velocity gradient suggesting rotating gas in the outflow region

Estimated disk radius of approximately 440 au and dust mass over 11 Earth masses

Abstract

We present images of IRAS~08235--4316 with the Dark Energy Camera Plane Survey (DECaPS; spanning 0.398--1.034$\,\mu$m, at ${\sim}1''$ resolution) and the Submillimeter Array (SMA; at 1.38\,mm/217\,GHz, at ${\sim}1.9''\times1.2''$ resolution), a YSO located in the Vela constellation near to the Puppis boundary, detected in a systematic search for new large/extended emission sources. The DECaPS data show an asymmetric bi--polar morphology with a large angular extent of ${\sim}7.1''$ separated by a dark lane, characteristic of highly--inclined protoplanetary disks and less-evolved YSOs with outflows. The SMA data show an extended continuum structure along the optical dark lane with a smaller angular extent of ${\sim}4.6''$. The detected $^{12}$CO J=2--1 emission tentatively shows a velocity gradient along the position angle of the dark lane/millimeter continuum, that may trace rotating gas. Additional $^{12}$CO emission is present which could trace infalling/outflowing gas, and/or a nearby gas cloud. We estimate a distance to IRAS~08235--4316 of at least ${\sim}191\,$pc. Supported by additional SED modelling, we infer IRAS~08235--4316 to be a newly discovered class~I YSO with an outflow, host to an embedded protoplanetary disk, with a large millimeter radius of ${\sim}440$\,au and dust mass ${\gtrsim}11\,M_\oplus$.