Taubenberger, S. and Navasardyan, H. and Maurer, J. I. and Zampieri, L. and Chugai, N. N. and Benetti, S. and Agnoletto, I. and Bufano, F. and Elias-Rosa, N. and Turatto, M. and Patat, F. and Cappellaro, E. and Mazzali, P. A. and Iijima, T. and Valenti, S. and Harutyunyan, A. and Claudi, R. and Dolci, M. (2011) The He-rich stripped-envelope core-collapse supernova 2008ax. Monthly Notices of the Royal Astronomical Society, 413 (3). pp. 2140-2156. ISSN 0035-8711 http://resolver.caltech.edu/CaltechAUTHORS:20110527-101408454
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Extensive optical and near-infrared (NIR) observations of the Type IIb supernova (SN IIb) 2008ax are presented, covering the first year after the explosion. The light curve is mostly similar in shape to that of the prototypical SN IIb 1993J, but shows a slightly faster decline rate at late phases and lacks the prominent narrow early-time peak of SN 1993J. From the bolometric light curve and ejecta expansion velocities, we estimate that about 0.07–0.15 M_⊙ of ^(56)Ni was produced during the explosion and that the total ejecta mass was between 2 and 5 M_⊙, with a kinetic energy of at least 10^(51) erg. The spectral evolution of SN 2008ax is similar to that of SN Ib/IIb 2007Y, exhibiting high-velocity Ca ii features at early phases and signs of ejecta–wind interaction from Hα observations at late times. NIR spectra show strong He i lines similar to SN Ib 1999ex and a large number of emission features at late times. Particularly interesting are the strong, double-peaked He i lines in late NIR spectra, which – together with the double-peaked [O i] emission in late optical spectra – provide clues for the asymmetry and large-scale Ni mixing in the ejecta.
|Additional Information:||© 2011 The Authors. © 2011 Royal Astronomical Society. Accepted 2011 January 4. Received 2010 December 28; in original form 2010 April 12. Article first published online: 8 Mar. 2011. This paper is based on observations collected at the 3.58 m Telescopio Nazionale Galileo (La Palma, Spain), the 2.2 m Telescope of the Centro Astronómico Hispano Alemán (Calar Alto, Spain), the Asiago 1.82 m and 1.22 m Telescopes (Italy), and the 1.08 m AZT-24 telescope (Campo Imperatore, Italy). We are grateful to the anonymous referee whose comments helped to improve this work considerably. Our thanks also go to the staff at the 3.58m Telescopio Nazionale Galileo (La Palma, Spain), the 2.2m Telescope of the Centro Astronómico Hispano Alemán (Calar Alto, Spain), the Asiago 1.22m and 1.82m Telescopes (Asiago, Italy) and the 1.08m AZT-24 telescope (Campo Imperatore, Italy). ST acknowledges support by the Transregional Collaborative Research Centre TRR33 ‘The Dark Universe’ of the German Research Foundation (DFG). We have made use of the NASA/IPAC Extragalactic Database (NED) operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This paper makes use of data obtained from the Isaac Newton Group Archive, which is maintained as part of the CASU Astronomical Data Centre at the Institute of Astronomy, Cambridge.|
|Subject Keywords:||supernovae: general; supernovae: individual: SN 2008ax; supernovae: individual: SN 1993J; supernovae: individual: SN 1999ex; supernovae: individual: SN 2007Y; galaxies: individual: NGC 4490|
|Official Citation:||Taubenberger, S., Navasardyan, H., Maurer, J. I., Zampieri, L., Chugai, N. N., Benetti, S., Agnoletto, I., Bufano, F., Elias-Rosa, N., Turatto, M., Patat, F., Cappellaro, E., Mazzali, P. A., Iijima, T., Valenti, S., Harutyunyan, A., Claudi, R. and Dolci, M. (2011), The He-rich stripped-envelope core-collapse supernova 2008ax. Monthly Notices of the Royal Astronomical Society, 413: 2140–2156. doi: 10.1111/j.1365-2966.2011.18287.x|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||27 May 2011 20:46|
|Last Modified:||27 May 2011 20:47|
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