Optical and Ultraviolet Observations of the Very Young Type IIP SN 2014cx in NGC 337

Abstract

Extensive photometric and spectroscopic observations are presented for SN 2014cx, a type IIP supernova (SN) exploding in the nearby galaxy NGC 337. The observations are performed in optical and ultraviolet bands, covering from -20 to +400 days from the peak light. The stringent detection limit from prediscovery images suggests that this supernova was actually detected within about 1 day after explosion. Evolution of the very early-time light curve of SN 2014cx is similar to that predicted from a shock breakout and post-shock cooling decline before reaching the optical peak. Our photometric observations show that SN 2014cx has a plateau duration of ~ 100 days, an absolute V-band magnitude of ~ -16.5 mag at t~50 days, and a nickel mass of 0.056+-0.008 Msun. The spectral evolution of SN 2014cx resembles that of normal SNe IIP like SN 1999em and SN 2004et, except that it has a slightly higher expansion velocity (~ 4200 km/s at 50 days). From the cooling curve of photospheric temperature, we derive that the progenitor has a pre-explosion radius of ~ 640 Rsun, consistent with those obtained from SNEC modeling (~ 620 Rsun) and hydrodynamical modeling of the observables (~ 570 Rsun). Moreover, the hydrodynamical simulations yield a total explosion energy of ~ 0.4*10e51 erg, and an ejected mass of ~ 8 Msun. These results indicate that the immediate progenitor of SN 2014cx is likely a red supergiant star with a mass of ~ 10 Msun.

47 pages, 12 figures and 7 tables. Accepted by ApJ

References in corpus (16)

• The death of massive stars - I. Observational constraints on the progenitors of type II-P supernovae
• Characterizing the V-band light-curves of hydrogen-rich type II supernovae
• SN 2005cs in M51 II. Complete Evolution in the Optical and the Near-Infrared
• SOUSA: the Swift Optical/Ultraviolet Supernova Archive
• Towards Characterization of the Type IIP Supernova Progenitor Population: a Statistical Sample of Light Curves from Pan-STARRS1
• Optical and Near-Infrared Observations of the Highly Reddened, Rapidly Expanding Type Ia Supernova 2006X in M100
• Photometric and spectroscopic evolution of the type IIP supernova SN 2004et
• Photometric and Spectroscopic Properties of Type II-P Supernovae
• The Standardized Candle Method for Type II Plateau Supernovae
• A Sample of Type II-L Supernovae
• From Spitzer Galaxy Photometry to Tully-Fisher Distances
• Supernova Shock Breakout from a Red Supergiant
• SN 2006bp: Probing the Shock Breakout of a Type II-P Supernova
• The Type IIP Supernova 2012aw in M95: hydrodynamical modelling of the photospheric phase from accurate spectrophotometric monitoring
• SN 2013ab : A normal type IIP supernova in NGC 5669
• GALEX Detection of Shock Breakout in Type II-P Supernova PS1-13arp: Implications for the Progenitor Star Wind

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