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Bus, Thomas Matheson, Weidong Li","submitted_at":"2001-09-27T23:21:37Z","abstract_excerpt":"We present 30 optical spectra and 49 photometric epochs sampling the first 517 days after discovery of supernova (SN) 1999em, and derive its distance through the expanding photosphere method (EPM). SN 1999em is shown to be a Type II-plateau (II-P) event, with a photometric plateau lasting until about 100 days after explosion. We identify the dominant ions responsible for most of the absorption features seen in the optical portion of the spectrum during the plateau phase. We find the distance to SN 1999em to be D = 8.2 +/- 0.6 Mpc, with an explosion date of 5.3 +/- 1.4 days before discovery.\n  "},"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":"astro-ph/0109535","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2001-09-27T23:21:37Z","cross_cats_sorted":[],"title_canon_sha256":"b112f3f6ba8ae299bb5744bd93df550c2ac8c32711bd3ebb6b55ffa24d3b016d","abstract_canon_sha256":"2412484ae3801bc61216c133a87043e73b892efd8adc7613a2ffe3f29a6fe930"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:12:02.856438Z","signature_b64":"WqSX+0DHmtDIns1ACqT4cZlgrj9JwHYY/oSiG41Q+4Rf+mqz9fJc/YieSbFS0GG9m4kzTREcRqkPH7iyKjeQCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5749795e2bb986df5899859cd90b439eb354decc9924a140624c4ec8160795fd","last_reissued_at":"2026-05-18T04:12:02.855969Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:12:02.855969Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The Distance to SN 1999em in NGC 1637 from the Expanding Photosphere Method","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Aaron J. 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