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Date and Time of the Query: 2019-06-25 T07:09:35 PDT
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For refcode 2016MNRAS.460.3529A:
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NED Abstract

Copyright by Royal Astronomical Society. 2016MNRAS.460.3529A Luminosity distributions of Type Ia supernovae Ashall, C.; Mazzali, P.; Sasdelli, M.; Prentice, S. J. Abstract. We have assembled a data set of 165 low redshift, z < 0.06, publicly available Type Ia supernovae (SNe Ia). We produce maximum light magnitude (M_B_ and M_V_) distributions of SNe Ia to explore the diversity of parameter space that they can fill. Before correction for host galaxy extinction we find that the mean M_B_ and M_V_ of SNe Ia are -18.58 +/- 0.07 and -18.72 +/- 0.05 mag, respectively. Host galaxy extinction is corrected using a new method based on the SN spectrum. After correction, the mean values of M_B_ and M_V_ of SNe Ia are -19.10 +/- 0.06 and -19.10 +/- 0.05 mag, respectively. After correction for host galaxy extinction, 'normal' SNe Ia (Deltam_15_(B) < 1.6 mag) fill a larger parameter space in the width-luminosity relation than previously suggested, and there is evidence for luminous SNe Ia with large Deltam_15_(B). We find a bimodal distribution in Deltam_15_(B), with a pronounced lack of transitional events at Deltam_15_(B) = 1.6 mag. We confirm that faster, low-luminosity SNe tend to come from passive galaxies. Dividing the sample by host galaxy type, SNe Ia from star-forming (S-F) galaxies have a mean M_B_ = -19.20 +/- 0.05 mag, while SNe Ia from passive galaxies have a mean M_B_ = -18.57 +/- 0.24 mag. Even excluding fast declining SNe, 'normal' (M_B_ < -18 mag) SNe Ia from S-F and passive galaxies are distinct. In the V band, there is a difference of 0.4 +/- 0.13 mag between the median (M_V_) values of the 'normal' SN Ia population from passive and S-F galaxies. This is consistent with (~15 +/- 10) per cent of 'normal' SNe Ia from S-F galaxies coming from an old stellar population. Key words: supernovae: general
Retrieve 22 NED objects in this reference.
Please click here for ADS abstract

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