Hops 383: an Outbursting Class 0 Protostar in Orion

February 2015 • 2015ApJ...800L...5S

Authors • Safron, Emily J. • Fischer, William J. • Megeath, S. Thomas • Furlan, Elise • Stutz, Amelia M. • Stanke, Thomas • Billot, Nicolas • Rebull, Luisa M. • Tobin, John J. • Ali, Babar • Allen, Lori E. • Booker, Joseph • Watson, Dan M. • Wilson, T. L.

Abstract • We report the dramatic mid-infrared brightening between 2004 and 2006 of Herschel Orion Protostar Survey (HOPS) 383, a deeply embedded protostar adjacent to NGC 1977 in Orion. By 2008, the source became a factor of 35 brighter at 24 μm with a brightness increase also apparent at 4.5 μm. The outburst is also detected in the submillimeter by comparing APEX/SABOCA to SCUBA data, and a scattered-light nebula appeared in NEWFIRM K_s imaging. The post-outburst spectral energy distribution indicates a Class 0 source with a dense envelope and a luminosity between 6 and 14 {{L}_⊙ }. Post-outburst time-series mid- and far-infrared photometry show no long-term fading and variability at the 18% level between 2009 and 2012. HOPS 383 is the first outbursting Class 0 object discovered, pointing to the importance of episodic accretion at early stages in the star formation process. Its dramatic rise and lack of fading over a 6 year period hint that it may be similar to FU Ori outbursts, although the luminosity appears to be significantly smaller than the canonical luminosities of such objects.

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• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2015ApJ...800L...5S
• PDF https://iopscience.iop.org/article/10.1088/2041-8205/800/1/L5/pdf
• PREPRINT http://arxiv.org/abs/1501.00492
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• ELECTR https://iopscience.iop.org/article/10.1088/2041-8205/800/1/L5