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Dong","submitted_at":"2021-08-25T18:02:56Z","abstract_excerpt":"We present deep Chandra X-ray observations of two nearby Type Ia supernovae, SN 2017cbv and SN 2020nlb, which reveal no X-ray emission down to a luminosity $L_X$$\\lesssim$5.3$\\times$10$^{37}$ and $\\lesssim$5.4$\\times$10$^{37}$ erg s$^{-1}$ (0.3--10 keV), respectively, at $\\sim$16--18 days after the explosion. 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McCully, C. Pellegrino, D. A. Howell, D. Hiramatsu, D. Janzen, D. J. Sand, D. Reichart, E. Y. Hsiao, J. Burke, J. E. Andrews, J. J. Swift, K. A. Bostroem, K. Itagaki, K. Misra, L. Chomiuk, L. Galbany, L. Wang, M. J. Lundquist, M. L. Graham, N. Smith, P. J. Brown, R. Dastidar, S. K. Sarbadhicary, S. Valenti, S. Wyatt, Y. Dong","submitted_at":"2021-08-25T18:02:56Z","abstract_excerpt":"We present deep Chandra X-ray observations of two nearby Type Ia supernovae, SN 2017cbv and SN 2020nlb, which reveal no X-ray emission down to a luminosity $L_X$$\\lesssim$5.3$\\times$10$^{37}$ and $\\lesssim$5.4$\\times$10$^{37}$ erg s$^{-1}$ (0.3--10 keV), respectively, at $\\sim$16--18 days after the explosion. 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