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http://hdl.handle.net/20.500.12386/30987
Titolo: | VVV-WIT-01: highly obscured classical nova or protostellar collision? | Autori: | Lucas, P. W. Minniti, D. Kamble, A. Kaplan, D. L. Cross, N. Dekany, I. Ivanov, V. D. Kurtev, R. Saito, R. K. Smith, L. C. Catelan, M. MASETTI, NICOLA Toledo, I. Hempel, M. Thompson, M. A. Contreras Peña, C. Forbrich, J. Krause, M. Dale, J. Borissova, J. Emerson, J. |
Data pubblicazione: | 2020 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 492 | Fascicolo: | 4 | Da pagina:: | 4847 | 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<SUB>s</SUB> = 5.2). It peaked before March 2010, then faded by ˜9.5 mag over the following 2 yr. The 1.6-22 μm spectral energy distribution in March 2010 was well fit by a highly obscured blackbody with T ˜ 1000 K and A_{K_s} ˜ 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 ≈ 0.01-0.02), which suggests a physical association, e.g. a collision between low mass protostars. However, blackbody emission at T ˜ 1000 K is common in classical novae (especially CO novae) at the infrared peak in the light curve due to condensation of dust ˜30-60 d after the explosion. Radio follow-up with the Australia Telescope Compact Array 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 = 0.13-0.24. After weighing several options, it appears likely that VVV-WIT-01 was a classical nova event located behind an IRDC.... | URI: | http://hdl.handle.net/20.500.12386/30987 | URL: | https://academic.oup.com/mnras/article/492/4/4847/5709937 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/staa155 | Bibcode ADS: | 2020MNRAS.492.4847L | Fulltext: | open |
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