The underluminous Type Ia supernova 2005bl and the class of objects similar to SN 1991bg
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2008Metadata
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Taubenberger, S.
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The underluminous Type Ia supernova 2005bl and the class of objects similar to SN 1991bg
Author
- Taubenberger, S.;
- Hachinger, S.;
- Pignata Libralato, Giuliano;
- Mazzali, Paolo;
- Contreras, C.;
- Valenti, S.;
- Pastorello, A.;
- Elias Rosa, L.;
- Bärnbantner, O.;
- Barwig, H.;
- Benetti, S.;
- Dolci, M.;
- Fliri, J.;
- Folatelli, Gastón;
- Freedman, W. L.;
- González, S.;
- Hamuy Wackenhut, Mario;
- Krzeminski, W.;
- Morrell, N.;
- Navasardyan, H.;
- Persson, S. E.;
- Phillips, M. M.;
- Ries, C.;
- Roth, M.;
- Suntzeff, Nicholas B.;
- Turatto, M.;
- Hillebrandt, W.;
Abstract
Optical observations of the Type Ia supernova (SN Ia) 2005bl in NGC 4070, obtained from
−6 to +66 d with respect to the B-band maximum, are presented. The photometric evolution
is characterized by rapidly declining light curves [ m15(B)true = 1.93] and red colours
at peak and soon thereafter. With MB,max = −17.24 the SN is an underluminous SN Ia,
similar to the peculiar SNe 1991bg and 1999by. This similarity also holds for the spectroscopic
appearance, the only remarkable difference being the likely presence of carbon in
pre-maximum spectra of SN 2005bl. A comparison study among underluminous SNe Ia is
performed, based on a number of spectrophotometric parameters. Previously reported correlations
of the light-curve decline rate with peak luminosity and R(Si) are confirmed, and
a large range of post-maximum Si II λ6355 velocity gradients is encountered. 1D synthetic
spectra for SN 2005bl are presented, which confirm the presence of carbon and suggest an
overall low burning efficiency with a significant amount of leftover unburned material. Also,
the Fe content in pre-maximum spectra is very low, which may point to a low metallicity of the
precursor. Implications for possible progenitor scenarios of underluminous SNe Ia are briefly
discussed.
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Artículo de publicación ISI
Identifier
URI: https://repositorio.uchile.cl/handle/2250/126074
DOI: doi:10.1111/j.1365-2966.2008.12843.x
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Mon. Not. R. Astron. Soc. 385, 75–96 (2008)
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