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http://hdl.handle.net/20.500.12386/27934
Titolo: | SNhunt151: an explosive event inside a dense cocoon | Autori: | ELIAS DE LA ROSA, NANCY DEL CARMEN BENETTI, Stefano CAPPELLARO, Enrico PASTORELLO, Andrea Terreran, G. Morales-Garoffolo, A. Howerton, S. C. Valenti, S. Kankare, E. Drake, A. J. Djorgovski, S. G. TOMASELLA, Lina Tartaglia, L. Kangas, T. Ochner, P. Filippenko, A. V. Ciabattari, F. Geier, S. Howell, D. A. Isern, J. Leonini, S. Pignata, G. TURATTO, Massimo |
Data pubblicazione: | 2018 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 475 | Fascicolo: | 2 | Da pagina:: | 2614 | Abstract: | SNhunt151 was initially classified as a supernova (SN) impostor (nonterminal outburst of a massive star). It exhibited a slow increase in luminosity, lasting about 450 d, followed by a major brightening that reaches M_V ≈ -18 mag. No source is detected to M_V ≳ -13 mag in archival images at the position of SNhunt151 before the slow rise. Low-to-mid-resolution optical spectra obtained during the pronounced brightening show very little evolution, being dominated at all times by multicomponent Balmer emission lines, a signature of interaction between the material ejected in the new outburst and the pre-existing circumstellar medium. We also analysed mid-infrared images from the Spitzer Space Telescope, detecting a source at the transient position in 2014 and 2015. Overall, SNhunt151 is spectroscopically a Type IIn SN, somewhat similar to SN 2009ip. However, there are also some differences, such as a slow pre-discovery rise, a relatively broad light-curve peak showing a longer rise time (∼50 d), and a slower decline, along with a negligible change in the temperature around the peak (T ≤ 10^4 K). We suggest that SNhunt151 is the result of an outburst, or an SN explosion, within a dense circumstellar nebula, similar to those embedding some luminous blue variables like η Carinae and originating from past mass-loss events. | URI: | http://hdl.handle.net/20.500.12386/27934 | URL: | https://arxiv.org/pdf/1801.03040.pdf https://academic.oup.com/mnras/article/475/2/2614/4795309 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/sty009 | Bibcode ADS: | 2018MNRAS.475.2614E | Fulltext: | open |
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