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We present optical photometric and low-resolution spectroscopic observationsof the Type II plateau supernova (SN) 2008in, which occurred in the outskirtsof the nearly face-on spiral galaxy M 61. Photometric data in the X-rays,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 daysbefore the explosion. This allowed us to constrain the epoch of the shockbreakout to JD = 2454825.6. The duration of the plateau phase, as derived fromthe photometric monitoring, was ~ 98 days. The spectra of SN 2008in show astriking resemblance to those of the archetypal low-luminosity IIP SNe 1997Dand 1999br. A comparison of ejecta kinematics of SN 2008in with thehydrodynamical simulations of Type IIP SNe by Dessart et al. (2010) indicatesthat it is a less energetic event (~ 5$\times10^{50}$ erg). However, the lightcurve indicates that the production of radioactive $^{56}$Ni is significantlyhigher than that in the low-luminosity SNe. Adopting an interstellar absorptionalong the SN direction of $A_V$ ~ 0.3 mag and a distance of 13.2 Mpc, weestimated a synthesized Ni mass of ~ 0.015 $M_{\odot}$. Employingsemi-analytical formulae (Litvinova & Nadezhin 1985), we derived a pre-SNradius of ~ 126$R_{\odot}$, an explosion energy of ~ 5.4$\times10^{50}$ erg anda total ejected mass of ~ 16.7$M_{\odot}$. The latter indicates that the zeroage main-sequence mass of the progenitor did not exceed 20$M_{\odot}$.Considering the above properties of SN 2008in, and its occurrence in a regionof sub-solar metallicity ([O/H] ~ 8.44 dex), it is unlikely that fall-back ofthe ejecta onto a newly formed black hole occurred in SN 2008in. We thereforefavor a low-energy explosion scenario of a relatively compact, moderate-massprogenitor star that generates a neutron star.

Sn 2008in - bridging the gap between normal and faint supernovae of type IIP