Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detection of a dense SiO jet in the evolved protostellar phase   Jets and outflows trace the accretion history of protostars. High-velocity
molecular jets have been observed from several protostars in the early Class\,0
phase of star formation, detected with the high-density tracer SiO. Until now,
no clear jet has been detected with SiO emission from isolated evolved Class\,I
protostellar systems. We report a prominent dense SiO jet from a Class\,I
source G205S3 (HOPS\,315: T$_{bol}$ $\sim$ 180 K, spectral index $\sim$ 0.417),
with a moderately high mass-loss rate ($\sim$ 0.59 $\times$ 10$^{-6}$ M$_\odot$
yr$^{-1}$) estimated from CO emission. Together, these features suggest that
G205S3 is still in a high accretion phase, similar to that expected of Class\,0
objects. We compare G205S3 to a representative Class\,0 system G206W2
(HOPS\,399) and literature Class\,0/I sources to explore the possible
explanations behind the SiO emission seen at the later phase. We estimate a
high inclination angle ($\sim$ 40$^\circ$) for G205S3 from CO emission, which
may expose the infrared emission from the central core and mislead the spectral
classification. However, the compact 1.3\,mm continuum, C$^{18}$O emission,
location in the bolometric luminosity to sub-millimeter fluxes diagram, outflow
force ($\sim$ 3.26 $\times$ 10$^{-5}$ M$_\odot$km s$^{-1}$/yr) are also
analogous to that of Class\,I systems. We thus consider G205S3 to be at the
very early phase of Class\,I, and in the late phase of ``high-accretion". The
episodic ejection could be due to the presence of an unknown binary, a
planetary companion, or dense clumps, where the required mass for such high
accretion could be supplied by a massive circumbinary disk.

30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol