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A Template-based Approach to the Photometric Classification of SN 1991bg-like Supernovae in the SDSS-II Supernova Survey

Journal Article · · The Astrophysical Journal (Online)
 [1];  [2];  [3];  [2];  [4]
  1. Univ. of Pittsburgh, PA (United States). Pittsburgh Particle Physics, Astrophysics, and Cosmology Center (PITT PACC). Department of Physics and Astronomy; OSTI
  2. Univ. of Pittsburgh, PA (United States). Pittsburgh Particle Physics, Astrophysics, and Cosmology Center (PITT PACC). Department of Physics and Astronomy
  3. Univ. of Pittsburgh, PA (United States). Pittsburgh Particle Physics, Astrophysics, and Cosmology Center (PITT PACC). Department of Physics and Astronomy; Universidad de Granada, Granada, Spain. Departamento de Física Teórica y del Cosmos
  4. Universidade de Lisboa, Avenida Rovisco Pais, Portugal. CENTRA-Centro de Astrofísica e Gravitação and Departamento de Física, Instituto Superior Técnico
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The use of SNe Ia to measure cosmological parameters has grown significantly over the past two decades. However, there exists a significant diversity in the SN Ia population that is not well understood. Overluminous SN 1991T-like and subluminous SN 1991bg-like objects are two characteristic examples of peculiar SNe. The identification and classification of such objects is an important step in studying what makes them unique from the remaining SN population. With the upcoming Vera C. Rubin Observatory promising on the order of a million new SNe over a 10 year survey, spectroscopic classifications will be possible for only a small subset of observed targets. As such, photometric classification has become an increasingly important concern in preparing for the next generation of astronomical surveys. Using observations from the Sloan Digital Sky Survey II (SDSS-II) SN Survey, we apply here an empirically based classification technique targeted at the identification of SN 1991bg-like SNe in photometric data sets. By performing dedicated fits to photometric data in the rest-frame redder and bluer bandpasses, we classify 16 previously unidentified 91bg-like SNe. Using SDSS-II host galaxy measurements, we find that these SNe are preferentially found in host galaxies with an older average stellar age than the hosts of normal SNe Ia. We also find that these SNe are found at a further physical distance from the center of their host galaxies. We find no statistically significant bias in host galaxy mass or specific star formation rate for these targets.
Research Organization:
Univ. of Pittsburgh, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0007914
OSTI ID:
1851041
Alternate ID(s):
OSTI ID: 23031852
Journal Information:
The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 2 Vol. 904; ISSN 1538-4357
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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Astronomy & Astrophysics