%0 Generic %1 kelly2015again %A Kelly, P. L. %A Rodney, S. A. %A Treu, T. %A Strolger, L. G. %A Foley, R. J. %A Jha, S. W. %A Selsing, J. %A Brammer, G. %A Bradac, M. %A Cenko, S. B. %A Graham, M. L. %A Graur, O. %A Filippenko, A. V. %A Hjorth, J. %A Matheson, T. %A McCully, C. %A Molino, A. %A Nonino, M. %A Riess, A. G. %A Schmidt, K. B. %A Tucker, B. %A von der Linden, A. %A Weiner, B. J. %A Zitrin, A. %D 2015 %K delay images lensing supernovae %T Deja Vu All Over Again: The Reappearance of Supernova Refsdal %U http://arxiv.org/abs/1512.04654 %X In Hubble Space Telescope (HST) imaging taken on 10 November 2014, four images of supernova (SN) 'Refsdal' (z = 1.49) appeared in an Einstein-cross--like configuration (images S1-S4) around an early-type galaxy in the cluster MACS J1149.5+2223 (z = 0.54). The gravitational potential of the cluster creates three full images of the star-forming host galaxy of the SN. Almost all lens models of the cluster have predicted that the SN should reappear within approximately one year in a second host-galaxy image, offset by ~8" from the previous images. In HST observations taken on 11 December 2015, we find a new source that we interpret as a new image of SN Refsdal. This marks the first time the appearance of a SN at a particular time and location in the sky was successfully predicted in advance! We use these data and the light curve from the first four observed images of SN Refsdal to place constraints on the relative time delay and magnification of the new image (SX), compared to images S1-S4. This enables us, for the first time, to test lens model predictions of both magnifications and time delays for a lensed SN. We find that the timing and brightness of the new image are consistent with the blind predictions of a fraction of the models. The reappearance illustrates the discriminatory power of this blind test and its utility to uncover sources of systematic uncertainty in the lens models. From planned HST photometry, we expect to reach a precision of 1-2% on the relative time delay between S1-S4 and SX.

@misc{kelly2015again, abstract = {In Hubble Space Telescope (HST) imaging taken on 10 November 2014, four images of supernova (SN) 'Refsdal' (z = 1.49) appeared in an Einstein-cross--like configuration (images S1-S4) around an early-type galaxy in the cluster MACS J1149.5+2223 (z = 0.54). The gravitational potential of the cluster creates three full images of the star-forming host galaxy of the SN. Almost all lens models of the cluster have predicted that the SN should reappear within approximately one year in a second host-galaxy image, offset by ~8" from the previous images. In HST observations taken on 11 December 2015, we find a new source that we interpret as a new image of SN Refsdal. This marks the first time the appearance of a SN at a particular time and location in the sky was successfully predicted in advance! We use these data and the light curve from the first four observed images of SN Refsdal to place constraints on the relative time delay and magnification of the new image (SX), compared to images S1-S4. This enables us, for the first time, to test lens model predictions of both magnifications and time delays for a lensed SN. We find that the timing and brightness of the new image are consistent with the blind predictions of a fraction of the models. The reappearance illustrates the discriminatory power of this blind test and its utility to uncover sources of systematic uncertainty in the lens models. From planned HST photometry, we expect to reach a precision of 1-2% on the relative time delay between S1-S4 and SX.}, added-at = {2015-12-16T10:01:25.000+0100}, author = {Kelly, P. L. and Rodney, S. A. and Treu, T. and Strolger, L. G. and Foley, R. J. and Jha, S. W. and Selsing, J. and Brammer, G. and Bradac, M. and Cenko, S. B. and Graham, M. L. and Graur, O. and Filippenko, A. V. and Hjorth, J. and Matheson, T. and McCully, C. and Molino, A. and Nonino, M. and Riess, A. G. and Schmidt, K. B. and Tucker, B. and von der Linden, A. and Weiner, B. J. and Zitrin, A.}, biburl = {https://www.bibsonomy.org/bibtex/23d12997f47014a4305fd8752168f4477/miki}, description = {[1512.04654] Deja Vu All Over Again: The Reappearance of Supernova Refsdal}, interhash = {c67312f574523bf103119e4931efff5e}, intrahash = {3d12997f47014a4305fd8752168f4477}, keywords = {delay images lensing supernovae}, note = {cite arxiv:1512.04654Comment: Submitted to ApJL on 12/11/15}, timestamp = {2015-12-16T10:01:25.000+0100}, title = {Deja Vu All Over Again: The Reappearance of Supernova Refsdal}, url = {http://arxiv.org/abs/1512.04654}, year = 2015 }