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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/27934
Title: SNhunt151: an explosive event inside a dense cocoon
Authors: 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 
Issue Date: 2018
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 475
Issue: 2
First Page: 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
Appears in Collections:1.01 Articoli in rivista

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