Evidence for a correlation between the Si II λ4000 width and type Ia supernova color

Jakob Nordin; Linda Ostman; Ariel Goobar; C. Balland; Hubert Lampeitl; Bob Nichol; Masao Sako; Donald P. Schneider; Mathew Smith; Jesper Sollerman; J. Craig Wheeler

doi:10.1088/0004-637X/734/1/42

Evidence for a correlation between the Si II λ4000 width and type Ia supernova color

Jakob Nordin, Linda Ostman, Ariel Goobar, C. Balland, Hubert Lampeitl, Bob Nichol, Masao Sako, Donald P. Schneider, Mathew Smith, Jesper Sollerman, J. Craig Wheeler

Institute of Cosmology & Gravitation

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Abstract

We study the pseudo-equivalent width of the Si ii λ4000 feature of Type Ia supernovae (SNe Ia) in the redshift range 0.0024 ≤ z ≤ 0.634. We find that this spectral indicator correlates with the light curve color excess (SALT2c) as well as previously defined spectroscopic subclasses (Branch types) and the evolution of the Si ii λ6150 velocity, i.e., the so-called velocity gradient. Based on our study of 55 objects from different surveys, we find indications that the Si ii λ4000 spectral indicator could provide important information to improve cosmological distance measurements with SNe Ia.

Original language	English
Pages (from-to)	42
Journal	The Astrophysical Journal
Volume	734
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/734/1/42
Publication status	Published - 10 Jun 2011

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0004-637X_734_1_42Final published version, 536 KBLicence: CC BY-SA

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title = "Evidence for a correlation between the Si II λ4000 width and type Ia supernova color",

abstract = "We study the pseudo-equivalent width of the Si ii λ4000 feature of Type Ia supernovae (SNe Ia) in the redshift range 0.0024 ≤ z ≤ 0.634. We find that this spectral indicator correlates with the light curve color excess (SALT2c) as well as previously defined spectroscopic subclasses (Branch types) and the evolution of the Si ii λ6150 velocity, i.e., the so-called velocity gradient. Based on our study of 55 objects from different surveys, we find indications that the Si ii λ4000 spectral indicator could provide important information to improve cosmological distance measurements with SNe Ia.",

author = "Jakob Nordin and Linda Ostman and Ariel Goobar and C. Balland and Hubert Lampeitl and Bob Nichol and Masao Sako and Schneider, {Donald P.} and Mathew Smith and Jesper Sollerman and Wheeler, {J. Craig}",

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T1 - Evidence for a correlation between the Si II λ4000 width and type Ia supernova color

AU - Nordin, Jakob

AU - Ostman, Linda

AU - Goobar, Ariel

AU - Balland, C.

AU - Lampeitl, Hubert

AU - Nichol, Bob

AU - Sako, Masao

AU - Schneider, Donald P.

AU - Smith, Mathew

AU - Sollerman, Jesper

AU - Wheeler, J. Craig

PY - 2011/6/10

Y1 - 2011/6/10

N2 - We study the pseudo-equivalent width of the Si ii λ4000 feature of Type Ia supernovae (SNe Ia) in the redshift range 0.0024 ≤ z ≤ 0.634. We find that this spectral indicator correlates with the light curve color excess (SALT2c) as well as previously defined spectroscopic subclasses (Branch types) and the evolution of the Si ii λ6150 velocity, i.e., the so-called velocity gradient. Based on our study of 55 objects from different surveys, we find indications that the Si ii λ4000 spectral indicator could provide important information to improve cosmological distance measurements with SNe Ia.

AB - We study the pseudo-equivalent width of the Si ii λ4000 feature of Type Ia supernovae (SNe Ia) in the redshift range 0.0024 ≤ z ≤ 0.634. We find that this spectral indicator correlates with the light curve color excess (SALT2c) as well as previously defined spectroscopic subclasses (Branch types) and the evolution of the Si ii λ6150 velocity, i.e., the so-called velocity gradient. Based on our study of 55 objects from different surveys, we find indications that the Si ii λ4000 spectral indicator could provide important information to improve cosmological distance measurements with SNe Ia.

U2 - 10.1088/0004-637X/734/1/42

DO - 10.1088/0004-637X/734/1/42

M3 - Article

SN - 0004-637X

VL - 734

SP - 42

JO - The Astrophysical Journal

JF - The Astrophysical Journal

IS - 1

ER -

Evidence for a correlation between the Si II λ4000 width and type Ia supernova color

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