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Date and Time of the Query: 2019-06-16 T03:58:16 PDT
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For refcode 2011ApJ...736...76R:
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2011ApJ...736...76R SN 2008in---Bridging the Gap between Normal and Faint Supernovae of Type IIP Roy, Rupak; Kumar, Brijesh; Benetti, Stefano; Pastorello, Andrea; Yuan, Fang; Brown, Peter J.; Immler, Stefan; Fatkhullin, Timur A.; Moskvitin, Alexander S.; Maund, Justyn; Akerlof, Carl W.; Wheeler, J. Craig; Sokolov, Vladimir V.; Quimby, Rorbert M.; Bufano, Filomena; Kumar, Brajesh; Misra, Kuntal; Pandey, S. B.; Elias-Rosa, Nancy; Roming, Peter W. A.; Sagar, Ram Abstract. 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 ~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 (~5 x 10^50^ erg). However, the light curve indicates that the production of radioactive ^56^Ni is significantly higher than that in the low-luminosity SNe. Adopting an interstellar absorption along the SN direction of A_V_ ~ 0.3 mag and a distance of 13.2 Mpc, we estimated a synthesized ^56^Ni mass of ~0.015 M_sun_. Employing semi-analytical formulae derived by Litvinova and Nadezhin, we derived a pre-SN radius of ~126 R_sun_, an explosion energy of ~5.4 x 10^50^ erg, and a total ejected mass of ~16.7 M_sun_. The latter indicates that the zero-age main-sequence mass of the progenitor did not exceed 20 M_sun_. Considering the above properties of SN 2008in and its occurrence in a region of sub-solar metallicity ([O/H] ~ 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. Key words: supernovae: general, supernovae: individual: 2008in
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