SIMBAD references

2008MNRAS.385...75T - Mon. Not. R. Astron. Soc., 385, 75-96 (2008/March-3)

The underluminous Type Ia supernova 2005bl and the class of objects similar to SN 1991bg.

TAUBENBERGER S., HACHINGER S., PIGNATA G., MAZZALI P.A., CONTRERAS C., VALENTI S., PASTORELLO A., ELIAS-ROSA N., BARNBANTNER O., BARWIG H., BENETTI S., DOLCI M., FLIRI J., FOLATELLI G., FREEDMAN W.L., GONZALEZ S., HAMUY M., KRZEMINSKI W., MORRELL N., NAVASARDYAN H., PERSSON S.E., PHILLIPS M.M., RIES C., ROTH M., SUNTZEFF N.B., TURATTO M. and HILLEBRANDT W.

Abstract (from CDS):

Optical observations of the Type Ia supernova (SN Ia) 2005bl in NGC 4070, obtained from -6 to +66d with respect to the B-band maximum, are presented. The photometric evolution is characterized by rapidly declining light curves [Δm15(B)true= 1.93] and red colours at peak and soon thereafter. With M_B,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 (Si) are confirmed, and a large range of post-maximum Siii 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.

Abstract Copyright: 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): supernovae: general - supernovae: individual: SN 2005bl - supernovae: individual: SN 1991bg - supernovae: individual: SN 1999by - supernovae: individual: SN 1998de - galaxies: individual: NGC 4070

CDS comments: In Fig 4.: Companion B of NGC 4070 is not identified. In Fig1 and Table 2: local sequence stars are not in Simbad.

Simbad objects: 57

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2020.10.25-23:36:56

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