Journal Article

Optical studies of SN 2009jf: a Type Ib supernova with an extremely slow decline and aspherical signature

D. K. Sahu, U. K. Gurugubelli, G. C. Anupama and K. Nomoto

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 413, issue 4, pages 2583-2594
Published in print June 2011 | ISSN: 0035-8711
Published online May 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18326.x
Optical studies of SN 2009jf: a Type Ib supernova with an extremely slow decline and aspherical signature

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Optical UBVRI photometry and medium-resolution spectroscopy of the Type Ib supernova SN 2009jf, during the period from ∼ −15 to +250 d, 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 Type Ib supernovae studied. With an absolute magnitude of MV=−17.96 ± 0.19 at peak, SN 2009jf is a normally bright supernova. The peak bolometric luminosity and the energy deposition rate via the 56Ni →56Co chain indicate that ∼0.17+0.03−0.03 M of 56Ni was ejected during the explosion. The He i 5876 Å line is clearly identified in the first spectrum of day ∼ −15, at a velocity of ∼16 000 km s−1. The [O i] 6300–6364 Å line seen in the nebular spectrum has a multipeaked and asymmetric emission profile, with the blue peak being stronger. The estimated flux in this line implies that ≳1.34 M 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 Mej= 4–9 M and kinetic energy EK= 3–8 × 1051 erg. The ejected mass estimate is indicative of an initial main-sequence mass of ≳20–25 M.

Keywords: supernovae: general; supernovae: individual: SN 2009jf; galaxies: individual: NGC 7479

Journal Article.  9907 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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