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Titolo: | The Emergence of the Infrared Transient VVV-WIT-06 | Autori: | Minniti, D. Saito, R. K. Forster, F. Pignata, G. Ivanov, V. D. Lucas, P. W. Beamin, J. C. Borissova, J. Catelan, M. Gonzalez, O. A. Hempel, M. Hsiao, E. Kurtev, R. Majaess, D. MASETTI, NICOLA Morrell, N. I. Phillips, M. M. Pullen, J. B. Rejkuba, M. Smith, L. Surot, F. Valenti, E. Zoccali, M. |
Data pubblicazione: | 2017 | Rivista: | THE ASTROPHYSICAL JOURNAL LETTERS | Numero: | 849 | Fascicolo: | 2 | Da pagina:: | 1 | Abstract: | We report the discovery of an enigmatic large-amplitude ({{∆ }}{Ks}> 10.5 mag) transient event in near-IR data obtained by the VISTA Variables in the Via Lactea (VVV) ESO Public Survey. The object (designated VVV-WIT-06) is located at R.A. = 17:07:18.917, decl. = -39:06:26.45 (J2000), corresponding to Galactic coordinates l = 347.14539, b = 0.88522. It exhibits a clear eruption, peaking at Ks = 9 mag during 2013 July and fading to {Ks}∼ 16.5 in 2017. Our late near-IR spectra show post-outburst emission lines, including some broad emission lines (upward of {FWHM}∼ 3000 km s<SUP>-1</SUP>). We estimate a total extinction of {A}<SUB>V</SUB>=10{--}15 mag in the surrounding field, and no progenitor was observed in ZYJHKs images obtained during 2010-2012 (down to {K}<SUB>s</SUB>> 18.5 mag). Subsequent deep near-IR imaging and spectroscopy, in concert with the available multiband photometry, indicate that VVV-WIT-06 may be either: (I) the closest Type I SN observed in about 400 years, (II) an exotic high-amplitude nova that would extend the known realm of such objects, or (III) a stellar merger. In all of these cases, VVV-WIT-06 is a fascinating and curious astrophysical target under any of the scenarios considered. <P />Based on observations taken within the ESO programmes 179.B-2002 and 298.D-5048, and on observations carried out at the Magellan Telescope at LCO. | URI: | http://hdl.handle.net/20.500.12386/26701 | URL: | https://iopscience.iop.org/article/10.3847/2041-8213/aa9374 | ISSN: | 2041-8205 | DOI: | 10.3847/2041-8213/aa9374 | Bibcode ADS: | 2017ApJ...849L..23M | Fulltext: | open |
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