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arXiv · 2001.05536

VVV-WIT-01: highly obscured classical nova or protostellar collision?

P. W. Lucas·D. Minniti·A. Kamble·D. L. Kaplan·N. Cross·I. Dekany·V. D. Ivanov·R. Kurtev·R. K. Saito·L. C. Smith·M. Catelan·N. Masetti·I. Toledo·M. Hempel·M. A. Thompson·C. Contreras Peña·J. Forbrich·M. Krause·J. Dale·J. Borissova·J. Emerson
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Abstract

A search of the first Data Release of the VISTA Variables in the Via Lactea (VVV) Survey discovered the exceptionally red transient VVV-WIT-01 ($H-K_s=5.2$). It peaked before March 2010, then faded by $\sim$9.5 mag over the following two years. The 1.6--22 $\mu$m spectral energy distribution in March 2010 was well fit by a highly obscured black body with $T \sim 1000$ K and $A_{K_s} \sim 6.6$ mag. The source is projected against the Infrared Dark Cloud (IRDC) SDC G331.062$-$0.294. The chance projection probability is small for any single event ($p \approx 0.01$ to 0.02) which suggests a physical association, e.g. a collision between low mass protostars. However, black body emission at $T \sim 1000$ K is common in classical novae (especially CO novae) at the infrared peak in the light curve, due to condensation of dust $\sim$30--60 days after the explosion. Radio follow up with the Australia Telescope Compact Array (ATCA) detected a fading continuum source with properties consistent with a classical nova but probably inconsistent with colliding protostars. Considering all VVV transients that could have been projected against a catalogued IRDC raises the probability of a chance association to $p=0.13$ to 0.24. After weighing several options, it appears likely that VVV-WIT-01 was a classical nova event located behind an IRDC.

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P. W. Lucas, D. Minniti, A. Kamble, D. L. Kaplan, N. Cross, I. Dekany, V. D. Ivanov, R. Kurtev, R. K. Saito, L. C. Smith, M. Catelan, N. Masetti, I. Toledo, M. Hempel, M. A. Thompson, C. Contreras Peña, J. Forbrich, M. Krause, J. Dale, J. Borissova, J. Emerson. 2020-01-15. VVV-WIT-01: highly obscured classical nova or protostellar collision?. https://doi.org/10.1093/mnras/staa155

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