Temperature-independent thermal radiation, P. Roney, A. Shahsafi, Y. Zhou, Z. Zhang, Y. Xiao, C. Wan, R. Wambold, J. Salman, Z. Yu, J. Li, J. T. Sadowski, R. Comin, S. Ramanathan and M. A. Kats, Proceedings of the National Academy of Sciences of the USA (in press, 2019, arXiv:1902.00252)