# Optical studies of SN 2009jf: A type Ib supernova with an extremely slow decline and aspherical signature

Source: [Optical studies of SN 2009jf: A type Ib supernova with an extremely slow decline and aspherical signature](<https://www.sota2.com/research/paper/68fa2fa81e209131ce86e047>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T17:42:15.234Z

Authors: D. K. Sahu, U.K. Gurugubelli, G. C. Anupama, K. Nomoto

Published: 2011-01-11T09:07:16.000Z

## Abstract

Optical $UBVRI$ photometry and medium resolution spectroscopy of the type Ib supernova SN 2009jf, during the period $\\sim -15$ to +250days with respect to the $B$ maximum are reported. The light curves are broad, with an extremely slow decline. The early post-maximum decline rate in the $V$ band is similar to SN 2008D, however, the late phase decline rate is slower than other studied type Ib supernovae. With an absolute magnitude of $M\_{V} = -17.96\\pm0.19$ magnitude at peak, SN 2009jf is a normally bright supernova. The peak bolometric luminosity and the energy deposition rate via $^{56}$Ni $\\rightarrow$ $^{56}$Co chain indicate that $\\sim {0.17}^{+0.03}\_{-0.03}$ M$\_{\\odot}$ of $^{56}$Ni was ejected during the explosion. He\\,I 5876 \\AA\\ line is clearly identified in the first spectrum of day $\\sim -15$, at a velocity of $\\sim 16000$ km sec$^{-1}$. The \[O\\,I\] 6300-6364 \\AA\\ line seen in the nebular spectrum has a multi-peaked and asymmetric emission profile, with the blue peak being stronger. The estimated flux in this line implies $\\ga 1.34$ M$\_\\odot$ oxygen was ejected. The slow evolution of the light curves of SN 2009jf indicates the presence of a massive ejecta. The high expansion velocity in the early phase and broader emission lines during the nebular phase suggest it to be an explosion with a large kinetic energy. A simple qualitative estimate leads to the ejecta mass of M$\_{\\rm ej} = 4-9$ M$\_\\odot$, and kinetic energy E$\_{\\rm K} = 3-8 \\times 10^{51}$ erg. The ejected mass estimate is indicative of an initial main-sequence mass of $\\ga 20- 25$ M$\_\\odot$.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1101.2068>)

[PDF](<https://arxiv.org/pdf/1101.2068.pdf>)