Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-10-19
Astronomy and Astrophysics
Astrophysics
Accepted for publication in The Astrophysical Journal. Minor revision, discussion section added
Scientific paper
10.1086/587772
$UBVRI$ photometry and medium resolution optical spectroscopy of peculiar Type Ia supernova SN 2005hk are presented and analysed, covering the pre-maximum 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 $\gsim 200$ days since explosion do not show the presence of forbidden [\ion{Fe}{ii}], [\ion{Fe}{iii}] and [\ion{Co}{iii}] lines, but are dominated by narrow, permitted \ion{Fe}{ii}, NIR \ion{Ca}{ii} and \ion{Na}{i} lines with P-Cygni profiles. Thermonuclear explosion model with Chandrasekhar mass ejecta and a kinetic energy smaller ($\KE = 0.3 \times 10^{51} {\rm ergs}$) than that of canonical Type Ia supernovae is found to well explain the observed bolometric light curve. The mass of \Nifs synthesized in this explosion is $0.18 \Msun$. 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.
Anupama G. C.
Kawabata Koji S.
Maeda Kei--ichi
Mazzali Paolo A.
Nomoto Ken'ichi
No associations
LandOfFree
The evolution of the peculiar Type Ia supernova SN 2005hk over 400 days does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The evolution of the peculiar Type Ia supernova SN 2005hk over 400 days, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The evolution of the peculiar Type Ia supernova SN 2005hk over 400 days will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-708320