Hostname: page-component-586b7cd67f-dlnhk Total loading time: 0 Render date: 2024-11-26T09:25:26.375Z Has data issue: false hasContentIssue false
  • English
  • Français

SNIa Diversity: Theory and Diagnostics

Published online by Cambridge University Press:  12 April 2016

R. Canal  and
P. Ruiz-Lapuente
R. Canal
Affiliation:
Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Barcelona, Spain
P. Ruiz-Lapuente
Affiliation:
Harvard-Smithsonian Center for Astrophysics 60 Garden St., Cambridge, MA 02138, USA

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Existing evidence of photometric and spectroscopic diversity among Type la supernovae is compared with the predictions from physical modeling of the explosions. Concerning light curves, changes in the central ignition density of massive (M ≃ Mch) C+O white dwarfs alone do not give appreciable variation. Spectroscopic diversity has been found in the nebular phase, the underluminous SN 1991bg providing an extreme case. A range of 0.4-0.8 Mʘ of 56Ni synthesized in the explosions is derived from the nebular spectra of a sample of SNe la. For SN 1991bg, however, a 56Ni mass of ∼ 0.1 Mʘ only is obtained. That leads us to explore models based on the detonation of low-mass WDs for this SN. Additionally, a nebular spectrum of SN 1991bg shows narrow Hα emission at the position of the SN. If this emission is confirmed against background contamination from the galaxy, it would be first evidence of a nondegenerate, H-rich companion in a SNIa.

Type
Type la Supernovae
Information
International Astronomical Union Colloquium , Volume 145: Supernovae and Supernova Remnants , 1996 , pp. 69 - 76
Copyright
Copyright © Cambridge University Press 1996

References

Arnett, W. D. 1969, A&SS, 5, 180 Google Scholar
Axelrod, T. A. 1980, in Type I Supernovae, ed. Wheeler, J. C. (Austin: Univ. of Texas Press), 80 Google Scholar
Bravo, E. et al. 1993, A&A, 269, 187 Google Scholar
Canal, R. et al. 1991, in SN 1987A and Other Supernovae, ed. Danziger, I.J. & Kjär, K. (Garching bei München: ESO), 153 Google Scholar
Filippenko, A. V. et al. 1992a, AJ, 104, 1543 Google Scholar
Filippenko, A. V. et al. 1992b, ApJ, 384, L15 Google Scholar
García, D. et al. 1993, in preparationGoogle Scholar
Hernanz, M., Isern, J., Canal, R., Labay, J., & Mochkovitch, R. 1988, ApJ, 324, 331 Google Scholar
Höflich, P., Müller, E. & Khokhlov, A. 1993, ApJS, in pressGoogle Scholar
Iben, I., Jr., & Tutukov, A. V. 1984, ApJS, 54, 335 Google Scholar
Jeffery, D. J. et al. 1992, ApJ, 397, 304 Google Scholar
Kenyon, S. J., Livio, M., Mikolajewska, J., & Tout, C. A 1993, ApJ, 407, L81 Google Scholar
Khokhlov, A. M. 1991, A&A, 245, 114 Google Scholar
Kirshner, R. P. et al. 1993, ApJ, in pressGoogle Scholar
Leibundgut, B. et al. 1991, ApJ, 371, L33 Google Scholar
Leibundgut, B. et al. 1993, AJ, 105, 301 Google Scholar
Livne, E. 1990, ApJ, 354, L53 Google Scholar
Livne, E. & Glasner, A. S. 1991, ApJ, 370, 272 Google Scholar
Livne, E., Tuchman, Y., & Wheeler, J. C. 1992, ApJ, 399, 665 Google Scholar
Meyerott, R. E. 1980, ApJ, 259, 257 Google Scholar
Nomoto, K., Thielemann, F.-K., & Yokoi, K. 1984, ApJ, 286, 644 Google Scholar
Phillips, M. M. 1993, ApJ, 413, L105 Google Scholar
Ruiz-Lapuente, P., & Lucy, L. B. 1992, ApJ, 400, 127 Google Scholar
Ruiz-Lapuente, P., & Filippenko, A. V. 1993, in Origin and Evolution of the Elements, ed. Prantzos, N. Vangioni-Flam, E. & Cassé, M. (Cambridge: Cambridge Univ. Press), p. 318 Google Scholar
Ruiz-Lapuente, et al. 1992, ApJ, 387, L33 Google Scholar
Ruiz-Lapuente, et al. 1993a, ApJ, 365, 728 Google Scholar
Ruiz-Lapuente, et al. 1993b, Nature, 365, 728 Google Scholar
Sutherland, P. G., & Wheeler, J. C. 1984, ApJ, 280, 282 Google Scholar
Timmes, F. X., & Woosley, S. E. 1992, ApJ, 397, 220 Google Scholar
Timmes, F. X., & Woosley, S. E. 1994, ApJ, 420, 348 Google Scholar
van den Bergh, S. 1993, ApJ 413, 67 Google Scholar
Wheeler, J.C., Swartz, D.A., & Harkness, R.P. 1993, Phys. Rep. 227, 113 Google Scholar
Woosley, S.E. 1992, in Gamma-Ray Line Astrophysics, ed. Durouchoux, P. & Prantzos, N. (New York: AIP), 270 Google Scholar
Woosley, S.E., & Weaver, T.A. 1986, ARA&A 24, 205 Google Scholar
Woosley, S.E., & Weaver, T.A., 1994, ApJ, 423, 371 Google Scholar
Woosley, S.E., Axelrod, T.S., & Weaver, T.A. 1984, in Stellar Nucleosynthesis, ed. Chiosi, C. & Renzini, A. (Dordrecht: Reidel), p. 263 CrossRefGoogle Scholar