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Optical broadband (UBVRI) photometric and low-resolution spectroscopicobservations of the type II-P supernova (SN) ASASSN-14dq are presented.ASASSN-14dq exploded in a low-luminosity/metallicity host galaxy UGC 11860, thesignatures of which are present as weak iron lines in the photospheric phasespectra. The SN has a plateau duration of $\sim\,$90 d, with a plateau declinerate of 1.38 $\rm mag\ (100 d)^{-1}$ in V-band which is higher than most typeII-P SNe. ASASSN-14dq is a luminous type II-P SN with a peak $V$-band absolutemagnitude of -17.7$\,\pm\,$0.2 mag. The light curve of ASASSN-14dq indicates itto be a fast-declining type II-P SN, making it a transitional event between thetype II-P and II-L SNe. The empirical relation between the steepness parameterand $\rm ^{56}Ni$ mass for type II SNe was rebuilt with the help ofwell-sampled light curves from the literature. A $\rm ^{56}Ni$ mass of$\sim\,$0.029 M$_{\odot}$ was estimated for ASASSN-14dq, which is slightlylower than the expected $\rm ^{56}Ni$ mass for a luminous type II-P SN. Usinganalytical light curve modelling, a progenitor radius of $\rm\sim3.6\times10^{13}$ cm, an ejecta mass of $\rm \sim10\ M_{\odot}$ and a totalenergy of $\rm \sim\,1.8\times 10^{51}$ ergs was estimated for this event. Thephotospheric velocity evolution of ASASSN-14dq resembles a type II-P SN, butthe Balmer features (H$\alpha$ and H$\beta$) show relatively slow velocityevolution. The high-velocity H$\alpha$ feature in the plateau phase, theasymmetric H$\alpha$ emission line profile in the nebular phase and theinferred outburst parameters indicate an interaction of the SN ejecta with thecircumstellar material (CSM).

ASASSN-14dq: A fast-declining type II-P Supernova in a low-luminosity host galaxy