SN 2009ip at late times - an interacting transient at+2 years

Morgan Fraser, Rubina Kotak, Andrea Pastorello, Anders Jerkstrand, Stephen J. Smartt, Ting-Wan Chen, Michael Childress, Gerard Gilmore, Cosimo Inserra, Erkki Kankare, Steve Margheim, Seppo Mattila, Stefano Valenti, Christopher Ashall, Stefano Benetti, Maria Theresa Botticella, Franz Erik Bauer, Heather Campbell, Nancy Elias-Rosa, Mathilde FleuryAvishay Gal-Yam, Stephan Hachinger, D. Andrew Howell, Laurent Le Guillou, Pierre-Francois Léget, Antonia Morales-Garoffolo, Joe Polshaw, Susanna Spiro, Mark Sullivan, Stefan Taubenberger, Massimo Turatto, Emma S. Walker, David R. Young, Bonnie Zhang

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)
270 Downloads (Pure)


We present photometric and spectroscopic observations of the interacting transient SN 2009ip taken during the 2013 and 2014 observing seasons. We characterize the photometric evolution as a steady and smooth decline in all bands, with a decline rate that is slower than expected for a solely Co-56-powered supernova at late phases. No further outbursts or eruptions were seen over a two year period from 2012 December until 2014 December. SN 2009ip remains brighter than its historic minimum from pre-discovery images. Spectroscopically, SN 2009ip continues to be dominated by strong, narrow (less than or similar to 2000 km s(-1)) emission lines of H, He, Ca, and Fe. While we make tenuous detections of [Fe II] lambda 7155 and [O I] lambda lambda 6300, 6364 lines at the end of 2013 June and the start of 2013 October, respectively, we see no strong broad nebular emission lines that could point to a core-collapse origin. In general, the lines appear relatively symmetric, with the exception of our final spectrum in 2014 May, when we observe the appearance of a redshifted shoulder of emission at +550 km s(-1). The lines are not blueshifted, and we see no significant near-or mid-infrared excess. From the spectroscopic and photometric evolution of SN 2009ip until 820 d after the start of the 2012a event, we still see no conclusive evidence for core-collapse, although whether any such signs could be masked by ongoing interaction is unclear.
Original languageEnglish
Pages (from-to)3886-3905
Number of pages20
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Early online date14 Sep 2015
Publication statusPublished - 11 Nov 2015


Dive into the research topics of 'SN 2009ip at late times - an interacting transient at+2 years'. Together they form a unique fingerprint.

Cite this