{"paper":{"title":"Dust Without Na I D Trace: The Case of Highly Attenuated Type Ib SN 2024vjc","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Andrea Pastorello, Andrea Reguitti, Avishay Gal-Yam, Chris Ashall, Claudia P. Guti\\'errez, Dino Pierluigi Fugazza, Erkki Kankare, Giorgio Valerin, Giuliano Pignata, Hanindyo Kuncarayakti, Irene Salmaso, Javier Silva-Farf\\'an, Jesper Sollerman, Joseph P. Anderson, Keiichi Maeda, Mariusz Gromadzki, Niko Pyykkinen, Priscila J. Pessi, Takashi Nagao, Thomas M. Reynolds, Ting-Wan Chen, Tom\\'as E. M\\\"uller-Bravo","submitted_at":"2026-07-26T14:36:41Z","abstract_excerpt":"Understanding dust attenuation toward extragalactic transients is critical for recovering their intrinsic properties and probing the local environments of distant galaxies. A popular diagnostic is the Na I D absorption equivalent width widely applied to extragalactic transients. In this paper, we present early-time optical and near-infrared observations of the Type Ib supernova (SN) SN 2024vjc, followed for $\\sim$130 days post-explosion. SN~2024vjc exhibits only weak Na~I~D absorption, indicating only a modest host attenuation with $E (B-V)_{\\rm host} \\sim 0.18$ mag; if this argument were appl"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.23690","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/2607.23690/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"}