Astrophys. J., 831, 69-69 (2016/November-1)
The evolution of far-infrared CO emission from protostars.
MANOJ P., GREEN J.D., MEGEATH S.T., EVANS II N.J., STUTZ A.M., TOBIN J.J., WATSON D.M., FISCHER W.J., FURLAN E. and HENNING T.
Abstract (from CDS):
We investigate the evolution of far-IR CO emission from protostars observed with Herschel/PACS for 50 sources from the combined sample of HOPS and DIGIT Herschel key programs. From the uniformly sampled spectral energy distributions, whose peaks are well sampled, we computed the Lbol, Tbol, and Lbol/Lsmm for these sources to search for correlations between far-IR CO emission and protostellar properties. We find a strong and tight correlation between far-IR CO luminosity (LCOfir) and the bolometric luminosity (Lbol) of the protostars with LCOfir \proptoLbol\0.7. We, however, do not find a strong correlation between LCOfir and protostellar evolutionary indicators, Tbol and Lbol/Lsmm. FIR CO emission from protostars traces the currently shocked gas by jets/outflows, and far-IR CO luminosity, LCOfir, is proportional to the instantaneous mass-loss rate, \dotMout. The correlation between LCOfir and Lbol, then, is indicative of instantaneous \dotMout tracking instantaneous \dotMacc. The lack of a correlation between LCOfir and evolutionary indicators Tbol and Lbol/Lsmm suggests that \dotMout and, therefore, \dotMacc do not show any clear evolutionary trend. These results are consistent with mass accretion/ejection in protostars being episodic. Taken together with the previous finding that the time-averaged mass-ejection/accretion rate declines during the protostellar phase, our results suggest that the instantaneous accretion/ejection rate of protostars is highly time variable and episodic, but the amplitude and/or frequency of this variability decreases with time such that the time-averaged accretion/ejection rate declines with system age.
© 2016. The American Astronomical Society. All rights reserved.
ISM: jets and outflows - stars: jets - stars: protostars - stars: winds, outflows - stars: winds, outflows
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