The evolution of the peculiar type Ia supernova SN 2005hk over 400 days

D. K. Sahu; Masaomi Tanaka; G. C. Anupama; Koji S. Kawabata; Keiichi Maeda; Nozomu Tominaga; Ke N.Ichi Nomoto; Paolo A. Mazzalli; T. P. Prabhu

doi:10.1086/587772

The evolution of the peculiar type Ia supernova SN 2005hk over 400 days

D. K. Sahu, Masaomi Tanaka, G. C. Anupama, Koji S. Kawabata, Keiichi Maeda, Nozomu Tominaga, Ke N.Ichi Nomoto, Paolo A. Mazzalli, T. P. Prabhu

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51 Citations (Scopus)

Abstract

UBVRI photometry and medium-resolution optical spectroscopy of the peculiar Type Ia supernova SN 2005hk are presented and analyzed, covering the premaximum phase to around 400 days after explosion. The supernova is found to be underluminous compared to "normal" Type Ia supernovae. The photometric and spectroscopic evolution of SN 2005hk is remarkably similar to the peculiar Type Ia event SN 2002cx. The expansion velocity of the supernova ejecta is found to be lower than normal Type Ia events. The spectra obtained 200 days since explosion do not show the presence of forbidden [Fe n], [Fe III], and [Co in] lines, but are dominated by narrow, permitted Fe n, NIR Ca and Na r lines with P Cygni profiles. The thermonuclear explosion model with Chandrasekhar mass ejecta and a kinetic energy smaller (E_K = 0.3 × 10⁵¹ ergs) than that of canonical Type Ia supernovae is found to well explain the observed bolometric light curve. The mass of 56Ni synthesized in this explosion is 0.18 M. The early spectra are successfully modeled with this less energetic model, with some modifications of the abundance distribution. The late spectrum is explained as a combination of a photospheric component and a nebular component.

Original language	English
Pages (from-to)	580-592
Number of pages	13
Journal	Astrophysical Journal
Volume	680
Issue number	1
DOIs	https://doi.org/10.1086/587772
Publication status	Published - 2008 Jun 10
Externally published	Yes

Keywords

Supernovae: general
Supernovae: individual (SN 2005hk)

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/587772

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title = "The evolution of the peculiar type Ia supernova SN 2005hk over 400 days",

abstract = "UBVRI photometry and medium-resolution optical spectroscopy of the peculiar Type Ia supernova SN 2005hk are presented and analyzed, covering the premaximum phase to around 400 days after explosion. The supernova is found to be underluminous compared to {"}normal{"} Type Ia supernovae. The photometric and spectroscopic evolution of SN 2005hk is remarkably similar to the peculiar Type Ia event SN 2002cx. The expansion velocity of the supernova ejecta is found to be lower than normal Type Ia events. The spectra obtained 200 days since explosion do not show the presence of forbidden [Fe n], [Fe III], and [Co in] lines, but are dominated by narrow, permitted Fe n, NIR Ca and Na r lines with P Cygni profiles. The thermonuclear explosion model with Chandrasekhar mass ejecta and a kinetic energy smaller (EK = 0.3 × 1051 ergs) than that of canonical Type Ia supernovae is found to well explain the observed bolometric light curve. The mass of 56Ni synthesized in this explosion is 0.18 M. The early spectra are successfully modeled with this less energetic model, with some modifications of the abundance distribution. The late spectrum is explained as a combination of a photospheric component and a nebular component.",

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T1 - The evolution of the peculiar type Ia supernova SN 2005hk over 400 days

AU - Sahu, D. K.

AU - Tanaka, Masaomi

AU - Anupama, G. C.

AU - Kawabata, Koji S.

AU - Maeda, Keiichi

AU - Tominaga, Nozomu

AU - Nomoto, Ke N.Ichi

AU - Mazzalli, Paolo A.

AU - Prabhu, T. P.

PY - 2008/6/10

Y1 - 2008/6/10

N2 - UBVRI photometry and medium-resolution optical spectroscopy of the peculiar Type Ia supernova SN 2005hk are presented and analyzed, covering the premaximum phase to around 400 days after explosion. The supernova is found to be underluminous compared to "normal" Type Ia supernovae. The photometric and spectroscopic evolution of SN 2005hk is remarkably similar to the peculiar Type Ia event SN 2002cx. The expansion velocity of the supernova ejecta is found to be lower than normal Type Ia events. The spectra obtained 200 days since explosion do not show the presence of forbidden [Fe n], [Fe III], and [Co in] lines, but are dominated by narrow, permitted Fe n, NIR Ca and Na r lines with P Cygni profiles. The thermonuclear explosion model with Chandrasekhar mass ejecta and a kinetic energy smaller (EK = 0.3 × 1051 ergs) than that of canonical Type Ia supernovae is found to well explain the observed bolometric light curve. The mass of 56Ni synthesized in this explosion is 0.18 M. The early spectra are successfully modeled with this less energetic model, with some modifications of the abundance distribution. The late spectrum is explained as a combination of a photospheric component and a nebular component.

AB - UBVRI photometry and medium-resolution optical spectroscopy of the peculiar Type Ia supernova SN 2005hk are presented and analyzed, covering the premaximum phase to around 400 days after explosion. The supernova is found to be underluminous compared to "normal" Type Ia supernovae. The photometric and spectroscopic evolution of SN 2005hk is remarkably similar to the peculiar Type Ia event SN 2002cx. The expansion velocity of the supernova ejecta is found to be lower than normal Type Ia events. The spectra obtained 200 days since explosion do not show the presence of forbidden [Fe n], [Fe III], and [Co in] lines, but are dominated by narrow, permitted Fe n, NIR Ca and Na r lines with P Cygni profiles. The thermonuclear explosion model with Chandrasekhar mass ejecta and a kinetic energy smaller (EK = 0.3 × 1051 ergs) than that of canonical Type Ia supernovae is found to well explain the observed bolometric light curve. The mass of 56Ni synthesized in this explosion is 0.18 M. The early spectra are successfully modeled with this less energetic model, with some modifications of the abundance distribution. The late spectrum is explained as a combination of a photospheric component and a nebular component.

KW - Supernovae: general

KW - Supernovae: individual (SN 2005hk)

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The evolution of the peculiar type Ia supernova SN 2005hk over 400 days

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Keywords

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