TY - JOUR
T1 - The supernova CSS121015
T2 - 004244+132827: A clue for understanding superluminous supernovae
AU - Benetti, S.
AU - Nicholl, M.
AU - Cappellaro, E.
AU - Pastorello, A.
AU - Smartt, S. J.
AU - Elias-Rosa, N.
AU - Drake, A. J.
AU - Tomasella, L.
AU - Turatto, M.
AU - Harutyunyan, A.
AU - Taubenberger, S.
AU - Hachinger, S.
AU - Morales-Garoffolo, A.
AU - Chen, T. -W.
AU - Djorgovski, S. G.
AU - Fraser, M.
AU - Gal-Yam, Avishay
AU - Inserra, C.
AU - Mazzali, P.
AU - Pumo, M. L.
AU - Sollerman, J.
AU - Valenti, S.
AU - Young, D. R.
AU - Dennefeld, M.
AU - Le Guillou, Guillou, L.
AU - Fleury, M.
AU - Leget, P. -F.
N1 - PRIN-INAF; European Research Council under European Union [291222]; EU/FP7-ERC grant [307260]; Israeli Committee for planning and funding; ISF; GIF; Kimmel award; MICINN [AYA2011-24704/ESP]; ESF EUROCORES Program EuroGENESIS (MINECO) [EUI2009-04170]; European Union [267251]; US National Science Foundation [AST-1313422]; UK Science and Technology Facilities Council; National Aeronautics and Space AdministrationSB, EC, AP, LT and MT are partially supported by the PRIN-INAF 2011 with the project Transient Universe: from ESO Large to PESSTOO. Research leading to these results has received funding from the European Research Council under the European Union's Seventh Framework Programme (FP7/2007-2013)/ERC Grant agreement no. [291222] (PI: SJS) and EU/FP7-ERC grant no. [307260] (PI: AG-Y). AG-Y is also supported by 'The Quantum UniverseOI-Core programme by the Israeli Committee for planning and funding and the ISF, a GIF grant, and the Kimmel award'. NER and AMG acknowledge financial support by the MICINN grant AYA2011-24704/ESP, and by the ESF EUROCORES Program EuroGENESIS (MINECO grants EUI2009-04170). NER acknowledges the support from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 267251. The CRTS survey is supported by the US National Science Foundation under grant AST-1313422.This work is partially based on observations collected at (1) the European Organisation for Astronomical Research in the Southern hemisphere, Chile as part of PESSTO, (the PESSTO survey) ESO programme 188. D-3003; (2) the Copernico 1.82 m Telescope operated by INAF - Osservatorio Astronomico di Padova at Asiago; (3) the 3.6 m Italian Telescopio Nazionale Galileo operated by the Fundacion Galileo Galilei - INAF on the island of La Palma; (4) the 4.3 m William Herschel Telescope operated by the Isaac Newton Group of Telescope; (5) the Gran Telescopio Canarias (GTC), installed in the Spanish Observatorio del Roque de los Muchachos of the Instituto de
PY - 2014
Y1 - 2014
N2 - We present optical photometry and spectra of the superluminous Type II/IIn supernova (SN) CSS121015:004244+132827 (z = 0.2868) spanning epochs from -30 d (rest frame) to more than 200 d after maximum. CSS121015 is one of the more luminous SNe ever found and one of the best observed. The photometric evolution is characterized by a relatively fast rise to maximum (~40 d in the SN rest frame), and by a linear post-maximum decline. The light curve shows no sign of a break to an exponential tail. A broad Hα is first detected at ~+40 d (rest frame). Narrow, barely resolved Balmer and [O iii] 5007 Å lines, with decreasing strength, are visible along the entire spectral evolution. The spectra are very similar to other superluminous supernovae (SLSNe) with hydrogen in their spectrum, and also to SN 2005gj, sometimes considered Type Ia interacting with H-rich circumstellar medium. The spectra are also similar to a subsample of H-deficient SLSNe. We propose that the properties of CSS121015 are consistent with the interaction of the ejecta with a massive, extended, opaque shell, lost by the progenitor decades before the final explosion, although a magnetar-powered model cannot be excluded. Based on the similarity of CSS121015 with other SLSNe (with and without H), we suggest that the shocked-shell scenario should be seriously considered as a plausible model for both types of SLSN.
AB - We present optical photometry and spectra of the superluminous Type II/IIn supernova (SN) CSS121015:004244+132827 (z = 0.2868) spanning epochs from -30 d (rest frame) to more than 200 d after maximum. CSS121015 is one of the more luminous SNe ever found and one of the best observed. The photometric evolution is characterized by a relatively fast rise to maximum (~40 d in the SN rest frame), and by a linear post-maximum decline. The light curve shows no sign of a break to an exponential tail. A broad Hα is first detected at ~+40 d (rest frame). Narrow, barely resolved Balmer and [O iii] 5007 Å lines, with decreasing strength, are visible along the entire spectral evolution. The spectra are very similar to other superluminous supernovae (SLSNe) with hydrogen in their spectrum, and also to SN 2005gj, sometimes considered Type Ia interacting with H-rich circumstellar medium. The spectra are also similar to a subsample of H-deficient SLSNe. We propose that the properties of CSS121015 are consistent with the interaction of the ejecta with a massive, extended, opaque shell, lost by the progenitor decades before the final explosion, although a magnetar-powered model cannot be excluded. Based on the similarity of CSS121015 with other SLSNe (with and without H), we suggest that the shocked-shell scenario should be seriously considered as a plausible model for both types of SLSN.
UR - http://www.scopus.com/inward/record.url?scp=84900019232&partnerID=8YFLogxK
U2 - 10.1093/mnras/stu538
DO - 10.1093/mnras/stu538
M3 - مقالة
SN - 0035-8711
VL - 441
SP - 289
EP - 303
JO - MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
JF - MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
IS - 1
ER -