201. OISTER optical and near-infrared observations of the super-Chandrasekhar supernova candidate SN2012dn: Dust emission from the circumstellar shell.
- Author
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Masayuki YAMANAKA, Keiichi MAEDA, Masaomi TANAKA, Nozomu TOMINAGA, Koji S. KAWABATA, Katsutoshi TAKAKI, Miho KAWABATA, Tatsuya NAKAOKA, Issei UENO, Hiroshi AKITAYA, Takahiro NAGAYAMA, Jun TAKAHASHI, Satoshi HONDA, Toshihiro OMODAKA, Ryo MIYANOSHITA, Takashi NAGAO, Makoto WATANABE, Mizuki ISOGAI, Akira ARAI, and Ryosuke ITOH
- Subjects
SUPERNOVAE ,CIRCUMSTELLAR matter ,NEAR infrared radiation ,LIGHT curves ,WAVELENGTHS - Abstract
We present extensively dense observations of the super-Chandrasekhar supernova (SC SN) candidate SN2012dn from -11 to +140 d after the date of its B-band maximum in the optical and near-infrared (NIR) wavelengths conducted through the OISTER ToO (Optical and Infrared Synergetic Telescopes for Education and Research Target of Opportunity) program. The NIR light curves and color evolutions up to 35 days after the B-band maximum provided an excellent match with those of another SC SN 2009dc, providing further support to the nature of SN 2012dn as an SC SN. We found that SN 2012dn exhibited strong excesses in the NIR wavelengths from 30 d after the B-band maximum. The H- and K
s -band light curves exhibited much later maximum dates at 40 and 70 d after the B-band maximum, respectively, compared with those of normal SNe Ia. The H- and Ks -band light curves subtracted by those of SN2009dc displayed plateaued evolutions, indicating an NIR echo from the surrounding dust. The distance to the inner boundary of the dust shell is limited to 4.8-6.4 x 10-2 pc. No emission lines were found in its early phase spectra, suggesting that the ejecta-circumstellar material interaction could not occur. On the other hand, we found no signature that strongly supports the scenario of dust formation. The mass-loss rate of the pre-explosion system is estimated to be 10-6 - 10-5 M⊙ yr-1 , assuming that the wind velocity of the system is 10-100 kms-1 , which suggests that the progenitor of SN 2012dn could be a recurrent nova system. We conclude that the progenitor of this SC SN could be explained by the single-degenerate scenario. [ABSTRACT FROM AUTHOR]- Published
- 2016
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