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Discovery and Observations of the Unusually Luminous Type-Defying II-P/II-L Supernova ASASSN-13co

Holoien T. W.-S., Prieto J. L., Pejcha O., Stanek Z., Kochanek C. S., Shappee B. J., Grupe D., Morrell N., Thorstensen J. R., Basu U., Beacom J. F., Bersier D., Brimacombe J., Davis A. B., Pojmański G., Skowron D. M.

Acta Astronomica

2016

Vol. 66, No. 2

219--238

We present photometric and spectroscopic observations of ASASSN-13co, an unusually luminous Type II supernova and the first core-collapse supernova discovered by the All-Sky Automated Survey for SuperNovae (ASAS-SN). First detection of the supernova was on UT 2013 August 29 and the data presented span roughly 3.5 months after discovery. We use the recently developed model by Pejcha and Prieto to model the multi-band light curves of ASASSN-13co and derive the bolometric luminosity curve. We compare ASASSN-13co to other Type II supernovae to show that it was unusually luminous for a Type II supernova and that it exhibited an atypical light curve shape that does not cleanly match that of either a standard Type II-L or Type II-P supernova.

Generation of waves in running stream

Basu U., Ghosh P.

International Journal of Applied Mechanics and Engineering

2003

Vol. 8, no 1

17-26

In this paper, a problem of the two-dimensional wave generation due to an initial disturbance at the free surface in an ocean of finite depth in the presence of surface tension and a uniform running stream is investigated. Using linear theory, the problem is formulated as an initial value problem for the velocity potential describing the ensuing motion in the fluid. In the mathematical analysis the Laplace and Hankel transform techniques have been utilized to obtain the elevation of the free surface in the form of an infinite integral. This is then evaluated asymptotically for large time and distance by applying the method of stationary phase. The form of the free surface is depicted graphically for two types of initial disturbances. The effect of the surface tension and the presence of the running stream on the wave motion are discussed.