Hydrogen-poor Superluminous Supernovae with Late-time H alpha Emission: Three Events From the Intermediate Palomar Transient Factory

Lin Yan, R. Lunnan, D. A. Perley, A. Gal-Yam, O. Yaron, R. Roy, R. Quimby, J. Sollerman, C. Fremling, G. Leloudas, S. B. Cenko, P. Vreeswijk, M. L. Graham, D. A. Howell, A. De Cia, E. O. Ofek, P. Nugent, S. R. Kulkarni, G. Hosseinzadeh, F. MasciC. McCully, U. D. Rebbapragada, P. Wozniak