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Thermal bremsstrahlung X-ray emission from at least some IIP's should reflect the larger end of the high mass-loss rates. Strangely, no IIP SNe are seen where the X-ray luminosity is large enough to suggest mass-loss rates greater than about $ 10^{-5} $ solar masses yr$^{-1}$. We investigate if this could be due to absorption of the X-ray emis"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1402.5150","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-02-20T21:24:26Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"b3944dac5d7f5fcf9674c4c6191b57ae533b16451928153e7dc0924e543beaf6","abstract_canon_sha256":"b08ca49657348f11659562d41194fa8c82c90e68d82d4aef0b5effd4cfb7e872"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:44:29.879832Z","signature_b64":"UieUsuQL4Kwf7prkwX3qbSfRfruU3JHzTKpa+geYaWvw7CoMOPahY3hw4TPZmIT9jkbUYeHu/XWjHS4hv/flBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"939ad7cfe58373631a1fd0a044ea75998050bc345c2edfb11498ec305c34561d","last_reissued_at":"2026-05-18T01:44:29.879149Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:44:29.879149Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"On the Lack of X-ray Bright Type IIP Supernovae","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"Vikram V. 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