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American Astronomical Society, Astrophysical Journal Letters, 1(779), p. L8, 2013

DOI: 10.1088/2041-8205/779/1/l8

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Detection of an outburst one year prior to the explosion of SN 2011ht

Journal article published in 2013 by M. Fraser ORCID, M. Magee ORCID, R. Kotak ORCID, S. J. Smartt, K. W. Smith, J. Polshaw, A. J. Drake, T. Boles, C.-H. Lee, W. S. Burgett, K. C. Chambers, P. W. Draper, H. Flewelling ORCID, K. W. Hodapp, N. Kaiser and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Using imaging from the Pan-STARRS1 survey, we identify a precursor outburst at epochs 287 and 170 days prior to the reported explosion of the purported Type IIn supernova (SN) 2011ht. In the Pan-STARRS data, a source coincident with SN 2011ht is detected exclusively in the \zps\ and \yps-bands. An absolute magnitude of M$_z≃$-11.8 suggests that this was an outburst of the progenitor star. Unfiltered, archival Catalina Real Time Transient survey images also reveal a coincident source from at least 258 to 138 days before the main event. We suggest that the outburst is likely to be an intrinsically red eruption, although we cannot conclusively exclude a series of erratic outbursts which were observed only in the redder bands by chance. This is only the fourth detection of an outburst prior to a claimed SN, and lends credence to the possibility that many more interacting transients have pre-explosion outbursts, which have been missed by current surveys. ; Comment: Revised version following referee report