{"paper":{"title":"Circumstellar Medium Constraints on the Environment of Two Nearby Type Ia Supernovae: SN 2017cbv and SN 2020nlb","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"C. 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$$\\lesssim$5.3$\\times$10$^{37}$ and $\\lesssim$5.4$\\times$10$^{37}$ erg s$^{-1}$ (0.3--10 keV), respectively, at $\\sim$16--18 days after the explosion. With these limits, we constrain the pre-explosion mass-loss rate of the progenitor system to be $\\dot{M}$$<$7.2$\\times$10$^{-9}$ and $<$9.7$\\times$10$^{-9}$ M$_{\\odot}$ yr$^{-1}$ for each (at a wind velocity $v_w$=100 km s$^{-1}$ and a radius of $R$$\\approx$10$^{16}$ cm), assuming any X-r"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.11407","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2108.11407/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}