Roy, Rupak and Kumar, Brijesh and Benetti, Stefano and Pastorello, Andrea and Yuan, Fang and Brown, Peter J. and Immler, Stefan and Fatkhullin, Timur A. and Moskvitin, Alexander S. and Maund, Justyn and Akerlof, Carl W. and Wheeler, J. Craig and Sokolov, Vladimir V. and Quimby, Robert M. and Bufano, Filomena and Kumar, Brajesh and Misra, Kuntal and Pandey, S. B. and Elias-Rosa, Nancy and Roming, Peter W. A. and Sagar, Ram (2011) SN 2008in—Bridging the Gap between Normal and Faint Supernovae of Type IIP. Astrophysical Journal, 736 (2). Art. No. 76. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20110902-100045778
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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 ~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 × 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 AV ~ 0.3 mag and a distance of 13.2 Mpc, we estimated a synthesized ^(56)Ni mass of ~0.015 M_☉. Employing semi-analytical formulae derived by Litvinova and Nadezhin, we derived a pre-SN radius of ~126 R_☉, an explosion energy of ~5.4 × 10^(50) erg, and a total ejected mass of ~16.7 M_☉. The latter indicates that the zero-age main-sequence mass of the progenitor did not exceed 20 M_☉. 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.
|Additional Information:||© 2011 The American Astronomical Society. Received 2011 February 9; accepted 2011 May 3; published 2011 July 7. We thank all the observers at the Aryabhatta Research Institute of Observational Sciences (ARIES) who provided their valuable time and support for the observations of this event. We are thankful to the observing staffs of ROTSE, REM, 2m IGO, 3.6m NTT, 6m BTA, and 9.2m HET for their kind cooperation in the observation of SN 2008in. This work was supported by the grant RNP 22.214.171.12483 of the Federal Agency of Education of Russia. Timur A. Fatkhullin and Alexander S. Moskvitin were supported by the grant of the President of the Russian Federation (MK-405.2010.2). This is also partially based on observations collected at the European Southern Observatory, Chile under the program 083.D-0970(A). Stefano Benetti and Filomena Bufano are partially supported by the PRIN-INAF 2009 with the project “Supernovae Variety and Nucleosynthesis Yields.” The research of J. Craig Wheeler is supported in part by NSF Grant AST-0707669 and by the Texas Advanced Research Program grant ASTRO-ARP-0094. This research is supported by NASA grant NNX08AV63G and NSF grant PHY-0801007. This work is partially based on observations made with the REM Telescope, INAF Chile. This research has made use of data obtained through the High Energy Astrophysics Science Archive Research Center Online Service, provided by the NASA/Goddard Space Flight Center. We are indebted to the Indo-Russian (DST-RFBR) project No. RUSP-836 (RFBR-08-02:91314) for the completion of this research work.|
|Subject Keywords:||supernovae: general; supernovae: individual (2008in)|
|Classification Code:||PACS: 97.60.Bw; 98.52.Nr; 97.10.Ri; 97.60.Lf; 95.85.Kr|
|Official Citation:||SN 2008in—Bridging the Gap between Normal and Faint Supernovae of Type IIP Rupak Roy et al. 2011 ApJ 736 76|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||02 Sep 2011 19:22|
|Last Modified:||26 Dec 2012 13:39|
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