Seeing the Outer Edge of the Infant Type Ia Supernova 2024epr in the Optical and Near Infrared by W. B. Hoogendam, D. O. Jones, C. Ashall, B. J. Shappee, R. J. Foley, M. A. Tucker, M. E. Huber, K. Auchettl, D. D. Desai, A. Do, J. T. Hinkle, S. Romagnoli, J. Shi, A. Syncatto, C. R. Angus, K. C. Chambers, D. A. Coulter, K. W. Davis, T. de Boer, A. Gagliano, M. Kong, C. -C. Lin, T. B. Lowe, E. A. Magnier, P. Minguez, Y. -C. Pan, K. C. Patra, S. A. Severson, K. Taggart, A. R. Wasserman, S. K. Yadavalli, P Chen, R. S. Post

“…The high velocities point to a density enhancement in the outer layers of the explosion, predicted by some models, but thick-shell He-detonation models do not match the smoothly rising light curve or apparent lack of He in our early-time NIR spectra. …”
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