During the following years several luminous outbursts were detected from the SN 2009ip.[3][2] In September 2012 SN 2009ip was classified as a young
type IIn supernova.[4]
^Drake, A. J; Howerton, S; McNaught, R; Djorgovski, S. G; Mahabal, A. A; Graham, M. J; Williams, R; Prieto, J; Catelan, M; Christensen, E; Larson, S (2012). "A New Luminous Outburst from SN 2009ip". The Astronomer's Telegram. 4334: 1.
Bibcode:
2012ATel.4334....1D.
^Burgasser, Adam; Nicholls, C; Aberasturi, Miriam (2012). "NIR Spectrum of SN 2009ip on 2012 Sep 27.3 Confirms Interpretation as a Type IIn". The Astronomer's Telegram. 4431: 1.
Bibcode:
2012ATel.4431....1B.
Further reading
Graham, M. L.; et al. (August 2017). "Clues to the nature of SN 2009ip - II. The continuing photometric and spectroscopic evolution to 1000 days". Monthly Notices of the Royal Astronomical Society. 469 (2): 1559–1572.
arXiv:1704.05868.
Bibcode:
2017MNRAS.469.1559G.
doi:
10.1093/mnras/stx948.
Smith, Nathan; et al. (December 2016). "Massive stars dying alone: the extremely remote environment of SN 2009ip". Monthly Notices of the Royal Astronomical Society. 463 (3): 2904–2911.
arXiv:1607.01056.
Bibcode:
2016MNRAS.463.2904S.
doi:
10.1093/mnras/stw2190.
Mauerhan, Jon; et al. (August 2014). "Multi-epoch spectropolarimetry of SN 2009ip: direct evidence for aspherical circumstellar material". Monthly Notices of the Royal Astronomical Society. 442 (2): 1166–1180.
arXiv:1403.4240.
Bibcode:
2014MNRAS.442.1166M.
doi:
10.1093/mnras/stu730.
Smith, Nathan; et al. (February 2014). "SN 2009ip and SN 2010mc: core-collapse Type IIn supernovae arising from blue supergiants". Monthly Notices of the Royal Astronomical Society. 438 (2): 1191–1207.
arXiv:1308.0112.
Bibcode:
2014MNRAS.438.1191S.
doi:
10.1093/mnras/stt2269.
Mauerhan, Jon C.; et al. (April 2013). "The unprecedented 2012 outburst of SN 2009ip: a luminous blue variable star becomes a true supernova". Monthly Notices of the Royal Astronomical Society. 430 (3): 1801–1810.
arXiv:1209.6320.
Bibcode:
2013MNRAS.430.1801M.
doi:
10.1093/mnras/stt009.
Miller, A. A.; et al. (September 2009). "A Previous Transient Consistent with the Location of SN 2009ip Suggests that SN 2009ip is Not a Supernova". The Astronomer's Telegram. 2183: 1.
Bibcode:
2009ATel.2183....1M.
Berger, E.; et al. (September 2009). "SN 2009ip is an LBV Outburst". The Astronomer's Telegram. 2184: 1.
Bibcode:
2009ATel.2184....1B.