SN2015bh: NGC2770's 4th supernova or a luminous blue variable on its way to a Wolf-Rayet star?

C. C. Thone, A. de Ugarte Postigo, G. Leloudas, C. Gall, Z. Cano, Kenji Maeda, S. Schulze, S. Campana, K. Wiersema, J. Groh, J. de la Rosa, F. E. Bauer, Daniele Malesani, J. Maund, N. Morrell, Y. Beletsky

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Very massive stars in the final phases of their lives often show unpredictable outbursts that can mimic supernovae, so-called, "SN impostors", but the distinction is not always straightforward. Here we present observations of a luminous blue variable (LBV) in NGC2770 in outburst over more than 20 yr that experienced a possible terminal explosion as type IIn SN in 2015, named SN 2015bh. This possible SN (or " main event") had a precursor peaking similar to 40 days before maximum. The total energy release of the main event ;is similar to 1.8 X 10(49) erg, consistent with a <0.5 M-circle dot shell plunging into a dense CSM. The emission lines show a single narrow P Cygni profile during the LBV phase and a double P Cygni profile post maximum suggesting an association of the second component with the possible SN. Since 1994 the star has been redder than an LBV in an S-Dor-like outburst. SN 2015bh lies within a spiral arm of NGC2770 next to several small star-forming regions with a metallicity of similar to 0.5 solar and a stellar population age of 7-10 Myr. SN 2015bh shares many similarities with SN 2009ip and may form a new class of objects that exhibit outbursts a few decades prior to a "hyper eruption" or final core-collapse. If the star survives this event it is undoubtedly altered, and we suggest that these "zombie stars" may evolve from an LBV to a Wolf-Rayet star over the timescale of only a few years. The final fate of these stars can only be determined with observations a decade or more after the SN-like event.
Original languageEnglish
Article numberA129
JournalAstronomy and Astrophysics
Number of pages29
Publication statusPublished - 2017

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