{"paper":{"title":"Origin of high-velocity ejecta and early red excess emission in the infant Type Ia supernova 2021aefx","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"Christopher D. Matzner, Dae-Sik Moon, Hong Soo Park, Kelvin C. C. Leong, Maria R. Drout, Sang Chul Kim, Youngdae Lee, Yuan Qi Ni","submitted_at":"2023-04-02T20:51:35Z","abstract_excerpt":"SN~2021aefx is a normal Type Ia Supernova (SN) with red excess emission over the first $\\sim$ 2 days. We present detailed analysis of this SN using our high-cadence KMTNet multi-band photometry, spectroscopy, and publicly available data. We provide the first measurements of its epochs of explosion (MJD 59529.32 $\\pm$ 0.16) as well as ``first light'' (MJD 59529.85 $\\pm$ 0.55) associated with the main ejecta ${\\rm{^{56}Ni}}$ distribution. This places our first detection of SN 2021aefx at $\\sim -$0.5 hours since ``first light'', indicating the presence of additional power sources. Our peak-spectr"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2304.00625","kind":"arxiv","version":3},"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/2304.00625/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"}