SN 2008In-Bridging The Gap Between Normal And Faint Supernovae Of Type IIp
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We present optical photometric and low-resolution spectroscopic observations of the Type II plateau supernova (SN) 2008in, which occurred in the outskirts of the nearly face-on spiral galaxy M61. Photometric data in the X-ray, ultraviolet, and near-infrared bands have been used to characterize this event. The SN field was imaged with the ROTSE-IIIb optical telescope about seven days before the explosion. This allowed us to constrain the epoch of the shock breakout to JD = 2454825.6. The duration of the plateau phase, as derived from the photometric monitoring, was similar to 98 days. The spectra of SN 2008in show a striking resemblance to those of the archetypal low-luminosity IIP SNe 1997D and 1999br. A comparison of ejecta kinematics of SN 2008in with the hydrodynamical simulations of Type IIP SNe by Dessart et al. indicates that it is a less energetic event (similar to 5 x 10(50) erg). However, the light curve indicates that the production of radioactive 56Ni is significantly higher than that in the low-luminosity SNe. Adopting an interstellar absorption along the SN direction of AV similar to 0.3 mag and a distance of 13.2Mpc, we estimated a synthesized 56Ni mass of similar to 0.015 M-circle dot. Employing semi-analytical formulae derived by Litvinova and Nadezhin, we derived a pre-SN radius of similar to 126R(circle dot), an explosion energy of similar to 5.4x10(50) erg, and a total ejected mass of similar to 16.7M(circle dot). The latter indicates that the zero-age main-sequence mass of the progenitor did not exceed 20M(circle dot). Considering the above properties of SN 2008in and its occurrence in a region of sub-solar metallicity ([O/H] similar to 8.44 dex), it is unlikely that fall-back of the ejecta onto a newly formed black hole occurred in SN 2008in. We therefore favor a low-energy explosion scenario of a relatively compact, moderate-mass progenitor star that generates a neutron star.
CitationRoy, Rupak, Brijesh Kumar, Stefano Benetti, Andrea Pastorello, Fang Yuan, Peter J. Brown, Stefan Immler et al. "SN 2008inﾗBridging the Gap between Normal and Faint Supernovae of Type IIP." The Astrophysical Journal, Vol. 736, No. 2 (Aug., 2011): 76.
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