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Title: Defining photometric peculiar type Ia supernovae

We present a new photometric identification technique for SN 1991bg-like type Ia supernovae (SNe Ia), i.e., objects with light curve characteristics such as later primary maxima and the absence of a secondary peak in redder filters. This method is capable of selecting this sub-group from the normal type Ia population. Furthermore, we find that recently identified peculiar sub-types such as SNe Iax and super-Chandrasekhar SNe Ia have photometric characteristics similar to 91bg-like SNe Ia, namely, the absence of secondary maxima and shoulders at longer wavelengths, and can also be classified with our technique. The similarity of these different SN Ia sub-groups perhaps suggests common physical conditions. This typing methodology permits the photometric identification of peculiar SNe Ia in large upcoming wide-field surveys either to study them further or to obtain a pure sample of normal SNe Ia for cosmological studies.
Authors:
; ; ; ; ; ; ;  [1] ; ;  [2] ;  [3] ;  [4]
  1. Millennium Institute of Astrophysics, Casilla 36-D, Santiago (Chile)
  2. Carnegie Observatories, Las Campanas Observatory, Casilla 601, La Serena (Chile)
  3. Kavli Institute for the Physics and Mathematics of the Universe, the University of Tokyo, Kashiwa 277-8583 (Kavli IPMU, WPI) (Japan)
  4. European Southern Observatory, Alonso de Córdova 3107, Casilla 19, Santiago (Chile)
Publication Date:
OSTI Identifier:
22370036
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 795; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMOLOGY; TYPE I SUPERNOVAE; VISIBLE RADIATION; WAVELENGTHS