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Title: | Massive stars exploding in a He-rich circumstellar medium - VI. Observations of two distant Type Ibn supernova candidates discovered by La Silla-QUEST | Authors: | PASTORELLO, Andrea Hadjiyska, E. Rabinowitz, D. Valenti, S. TURATTO, Massimo Fasano, G. Benitez-Herrera, S. Baltay, C. BENETTI, Stefano BOTTICELLA, MARIA TERESA CAPPELLARO, Enrico ELIAS DE LA ROSA, NANCY DEL CARMEN Ellman, N. Feindt, U. Filippenko, A. V. Fraser, M. Gal-Yam, A. Graham, M. L. Howell, D. A. Inserra, C. Kelly, P. L. Kotak, R. Kowalski, M. McKinnon, R. Morales-Garoffolo, A. Nugent, P. E. Smartt, S. J. Smith, K. W. Stritzinger, M. D. Sullivan, M. Taubenberger, S. Walker, E. S. Yaron, O. Young, D. R. |
Issue Date: | 2015 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 449 | Issue: | 2 | First Page: | 1954 | Abstract: | We present optical observations of the peculiar stripped-envelope supernovae (SNe) LSQ12btw and LSQ13ccw discovered by the La Silla-QUEST survey. LSQ12btw reaches an absolute peak magnitude of M<SUB>g</SUB> = -19.3 ± 0.2, and shows an asymmetric light curve. Stringent pre-discovery limits constrain its rise time to maximum light to less than 4 d, with a slower post-peak luminosity decline, similar to that experienced by the prototypical SN Ibn 2006jc. LSQ13ccw is somewhat different: while it also exhibits a very fast rise to maximum, it reaches a fainter absolute peak magnitude (M<SUB>g</SUB> = -18.4 ± 0.2), and experiences an extremely rapid post-peak decline similar to that observed in the peculiar SN Ib 2002bj. A stringent pre-discovery limit and an early marginal detection of LSQ13ccw allow us to determine the explosion time with an uncertainty of ±1 d. The spectra of LSQ12btw show the typical narrow He I emission lines characterizing Type Ibn SNe, suggesting that the SN ejecta are interacting with He-rich circumstellar material. The He I lines in the spectra of LSQ13ccw exhibit weak narrow emissions superposed on broad components. An unresolved Hα line is also detected, suggesting a tentative Type Ibn/IIn classification. As for other SNe Ibn, we argue that LSQ12btw and LSQ13ccw likely result from the explosions of Wolf-Rayet stars that experienced instability phases prior to core collapse. We inspect the host galaxies of SNe Ibn, and we show that all of them but one are hosted in spiral galaxies, likely in environments spanning a wide metallicity range. | Acknowledgments: | This work is partially based on observations obtained under the ESO-NTT programmes with IDs 184.D-1140 and ID 188.D-3003, with the latter being part of PESSTO Survey. We are grateful to S. Bradley Cenko, Kelsey I. Clubb and WeiKang Zheng for their help with observations of LSQ13ccw at the Keck-II telescope, and to M. L. Pumo and S. Schulze for useful discussions. AP, EC, SB and MT are partially supported by the PRIN-INAF (Istituto Nazionale di Astrofisica) 2011 with the project ‘Transient Universe: from ESO Large to PESSTO’. Research leading to these results has received funding from the European Research Council (ERC) 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). SJS is also supported by STFC grants ST/I001123/1 and ST/L000709/1. AG-Y is also supported by The Quantum Universe I-Core programme by the Israeli Committee for planning and funding, the ISF and GIF grants, and the Kimmel award. This research used resources of the National Energy Research Scientific Computing Center, which is supported by the Office of Science of the US Department of Energy under Contract No. DE-AC02-05CH11231. This work was partly supported by the European Union FP7 programme through ERC grant no. 320360. NER acknowledges support from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 267251 ‘Astronomy Fellowships in Italy’. AMG acknowledges financial support by the MICINN grant AYA2011-24704/ESP, by the ESF EUROCORES Program EuroGENESIS (MINECO grants EUI2009-04170), SGR grants of the Generalitat de Catalunya, and by the EU-FEDER funds. MDS gratefully acknowledges generous support provided by the Danish Agency for Science and Technology and Innovation realized through a Sapere Aude Level 2 grant. ST acknowledges support by the Transregional Collaborative Research Centre TRR 33 ‘The Dark Universe’ of the DFG. AVF's supernova group at UC Berkeley received support through NSF grant AST–1211916, the TABASGO Foundation, Gary and Cynthia Bengier, the Richard and Rhoda Goldman Fund, and the Christopher R. Redlich Fund. This paper is based on observations made with the Italian Telescopio Nazionale Galileo (TNG) operated on the island of La Palma by the Fundación Galileo Galilei of the INAF . It is also based on observations made with the LT and the GTC, operated on the island of La Palma at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration (NASA). The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. This work makes use of observations from the LCOGT network, and utilizes data from the 40-inch ESO Schmidt Telescope at the La Silla Observatory in Chile with the large-area QUEST camera built at Yale University and Indiana University. The PS1 Surveys have been made possible through contributions of the Institute for Astronomy, the University of Hawaii, the Pan-STARRS Project Office, the Max-Planck Society and its participating institutes, the Max Planck Institute for Astronomy, Heidelberg and the Max Planck Institute for Extraterrestrial Physics, Garching, The Johns Hopkins University, Durham University, the University of Edinburgh, Queen's University Belfast, the Harvard–Smithsonian Center for Astrophysics, the Las Cumbres Observatory Global Telescope Network, Inc., the National Central University of Taiwan, the Space Telescope Science Institute, NASA under grant no. NNX08AR22G issued through the Planetary Science Division of the NASA Science Mission Directorate, the US NSF under grant AST–1238877, and the University of Maryland | URI: | http://hdl.handle.net/20.500.12386/23893 | URL: | https://academic.oup.com/mnras/article/449/2/1954/1069977 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stv335 | Bibcode ADS: | 2015MNRAS.449.1954P | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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