Pastorello, A. and Ofek, E. O. (2008) Massive stars exploding in a He-rich circumstellar medium - I. Type Ibn (SN 2006jc-like) events. Monthly Notices of the Royal Astronomical Society, 389 (1). pp. 113-130. ISSN 0035-8711 http://resolver.caltech.edu/CaltechAUTHORS:20110317-130413016
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We present new spectroscopic and photometric data of the Type Ibn supernovae 2006jc, 2000er and 2002ao. We discuss the general properties of this recently proposed supernova family, which also includes SN 1999cq. The early-time monitoring of SN 2000er traces the evolution of this class of objects during the first few days after the shock breakout. An overall similarity in the photometric and spectroscopic evolution is found among the members of this group, which would be unexpected if the energy in these core-collapse events was dominated by the interaction between supernova ejecta and circumstellar medium. Type Ibn supernovae appear to be rather normal Type Ib/c supernova explosions which occur within a He-rich circumstellar environment. SNe Ibn are therefore likely produced by the explosion of Wolf–Rayet progenitors still embedded in the He-rich material lost by the star in recent mass-loss episodes, which resemble known luminous blue variable eruptions. The evolved Wolf–Rayet star could either result from the evolution of a very massive star or be the more evolved member of a massive binary system.We also suggest that there are a number of arguments in favour of a Type Ibn classification for the historical SN 1885A (S-Andromedae), previously considered as an anomalous Type Ia event with some resemblance to SN 1991bg.
|Additional Information:||© 2008 Royal Astronomical Society. Accepted 2008 June 15. Received 2008 June 9; in original form 2008 January 14. We are grateful to R. J. Foley, M. Ganashelingham, W. Li, A. V. Filippenko, H. Kawakita, K. Kinugasa and T. Matheson for giving access to their data of SN 2002ao, SN 2006jc and SN 1999cq. AP thanks S. Blinnikov, M. T. Botticella, R.Kotak, P. Lundqvist, W. P. S. Meikle and F. Patat for useful discussions. SM acknowledges financial support from the Academy of Finland (project: 8120503). SB, EC and MT are supported by the Italian Ministry of Education via the PRIN 2006 n.2006022731-002. MDV thanks the Astrophysics Research Centre of the Queen’s University of Belfast, where part of this work was done, for its hospitality. The paper is partly based on observations collected at the European Southern Observatory, in the course of the programmes 66.B-0271, 66.A-0703, 66.A-0413, 66.D-0683, 78.D-0246. The paper is also based on observations collected at the Copernico 1.82-m Telescope of the INAF-Asiago Observatory (Mt Ekar, Italy), the 1-m Telescope of the Wise Observatory (Tel-Aviv University, Israel), the 2.3-m Bok Telescope and the Kuiper 1.55-m Telescope of the Steward Observatory (Arizona, USA), the Liverpool Telescope, the William Herschel Telescope and the 0.80-m Telescope of the Instituto de Astrofísica de Canarias in La Palma (Spain). We thank the support astronomers of the Liverpool Telescope for performing the follow-up observations of SN 2006jc. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. We also made use of the HyperLeda data base.|
|Subject Keywords:||supernovae: general; supernovae: individual: SN 2006jc; supernovae: individual: SN 1999cq; supernovae: individual: SN 2000er; supernovae: individual: SN 2002ao; supernovae: individual: SN 1885A|
|Official Citation:||Massive stars exploding in a He-rich circumstellar medium – I. Type Ibn (SN 2006jc-like) events Monthly Notices of the Royal Astronomical Society VL - 389, IS - 1, Blackwell Publishing Ltd SN - 1365-2966 UR - http://dx.doi.org/10.1111/j.1365-2966.2008.13602.x DO - 10.1111/j.1365-2966.2008.13602.x SP - 113|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||18 Mar 2011 21:57|
|Last Modified:||18 Mar 2011 21:57|
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