{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:RLA7PAJ2GMWDATUJ7BBNHP5L2T","short_pith_number":"pith:RLA7PAJ2","canonical_record":{"source":{"id":"2505.07880","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-05-10T14:42:33Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"d1abbcf8f343202cbd4adcd641b4d4d9489260b4029e40d7e000569d14ed0f01","abstract_canon_sha256":"b04b0ec0936bfe1851956c9e874f3071e01e143bd07015e85f1ed043a8717652"},"schema_version":"1.0"},"canonical_sha256":"8ac1f7813a332c304e89f842d3bfabd4d78581754a582a0f6f6a06b2e4ca21ed","source":{"kind":"arxiv","id":"2505.07880","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2505.07880","created_at":"2026-07-05T11:01:58Z"},{"alias_kind":"arxiv_version","alias_value":"2505.07880v1","created_at":"2026-07-05T11:01:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2505.07880","created_at":"2026-07-05T11:01:58Z"},{"alias_kind":"pith_short_12","alias_value":"RLA7PAJ2GMWD","created_at":"2026-07-05T11:01:58Z"},{"alias_kind":"pith_short_16","alias_value":"RLA7PAJ2GMWDATUJ","created_at":"2026-07-05T11:01:58Z"},{"alias_kind":"pith_short_8","alias_value":"RLA7PAJ2","created_at":"2026-07-05T11:01:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:RLA7PAJ2GMWDATUJ7BBNHP5L2T","target":"record","payload":{"canonical_record":{"source":{"id":"2505.07880","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-05-10T14:42:33Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"d1abbcf8f343202cbd4adcd641b4d4d9489260b4029e40d7e000569d14ed0f01","abstract_canon_sha256":"b04b0ec0936bfe1851956c9e874f3071e01e143bd07015e85f1ed043a8717652"},"schema_version":"1.0"},"canonical_sha256":"8ac1f7813a332c304e89f842d3bfabd4d78581754a582a0f6f6a06b2e4ca21ed","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:01:58.906150Z","signature_b64":"gUMI5rzKEHV5/tBaH1z032e/ot5mYw9ZuQBGekXKKmf5ADz4mG0aCEbfRmZ4b90BwiMq99FQsmYGy6W8Mk1OCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8ac1f7813a332c304e89f842d3bfabd4d78581754a582a0f6f6a06b2e4ca21ed","last_reissued_at":"2026-07-05T11:01:58.905681Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:01:58.905681Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2505.07880","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T11:01:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8ribtxgO8LFBEwtWyono0bDGJFTAAD8wfS8vOKjj09ZaI4aNnzFGxt5wIpnL6V0arjbtcx8slqDJWUA3F96rAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T04:43:57.424003Z"},"content_sha256":"8e10db9e0d05260cd16bfb4b54e36dbfb3320af3b96ea494d1c3839813549d4d","schema_version":"1.0","event_id":"sha256:8e10db9e0d05260cd16bfb4b54e36dbfb3320af3b96ea494d1c3839813549d4d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:RLA7PAJ2GMWDATUJ7BBNHP5L2T","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An Agnostic Approach to Building Empirical Type Ia Supernova Light Curves: Evidence for Intrinsic Chromatic Flux Variation Using Nearby Supernova Factory Data","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.HE","authors_text":"A. G. Kim, B. Hayden, C. Aragon, C. Baltay, C. Buton, C. Saunders, C. Tao, D. Fouchez, D. K\\\"usters, D. Rabinowitz, D. Rubin, E. Gangler, E. Pecontal, F. Mondon, G. Aldering, Jared Hand, J. Nordin, K. A. Ponder, K. Boone, K. Runge, Mitchell Karmen, M. Kowalski, M. Rigault, M. Vincenzi (The Nearby Supernova Factory), N. Suzuki, P. Antilogus, P.-F. L\\'eget, R. C. Thomas, R. Gupta, R. Pain, R. Pereira, S. Bailey, S. Bongard, S. Dixon, S. Perlmutter, S. Taubenberger, W. Hillebrandt, Y. Copin","submitted_at":"2025-05-10T14:42:33Z","abstract_excerpt":"We present a new empirical Type Ia supernova (SN Ia) model with three chromatic flux variation templates: one phase dependent and two phase independent. No underlying dust extinction model or patterns of intrinsic variability are assumed. Implemented with Stan and trained using spectrally binned Nearby Supernova Factory spectrophotometry, we examine this model's 2D, phase-independent flux variation space using two motivated basis representations. In both, the first phase-independent template captures variation that appears dust-like, while the second captures a combination of effectively intri"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.07880","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/2505.07880/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T11:01:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dlb4bMpdn9v0X1X8YdkVulwVcXIUjWTp7y/iafBYtPQVEFnhllXkMtxXtm2qs3IFGHp3O2mByG+hBqMqtkXrBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T04:43:57.424547Z"},"content_sha256":"6fc9f91801018b56c0b315e0c1634e1fed4073c9dca46e3ff54e736de87e3db1","schema_version":"1.0","event_id":"sha256:6fc9f91801018b56c0b315e0c1634e1fed4073c9dca46e3ff54e736de87e3db1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RLA7PAJ2GMWDATUJ7BBNHP5L2T/bundle.json","state_url":"https://pith.science/pith/RLA7PAJ2GMWDATUJ7BBNHP5L2T/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RLA7PAJ2GMWDATUJ7BBNHP5L2T/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-18T04:43:57Z","links":{"resolver":"https://pith.science/pith/RLA7PAJ2GMWDATUJ7BBNHP5L2T","bundle":"https://pith.science/pith/RLA7PAJ2GMWDATUJ7BBNHP5L2T/bundle.json","state":"https://pith.science/pith/RLA7PAJ2GMWDATUJ7BBNHP5L2T/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RLA7PAJ2GMWDATUJ7BBNHP5L2T/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:RLA7PAJ2GMWDATUJ7BBNHP5L2T","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"b04b0ec0936bfe1851956c9e874f3071e01e143bd07015e85f1ed043a8717652","cross_cats_sorted":["astro-ph.CO"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-05-10T14:42:33Z","title_canon_sha256":"d1abbcf8f343202cbd4adcd641b4d4d9489260b4029e40d7e000569d14ed0f01"},"schema_version":"1.0","source":{"id":"2505.07880","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2505.07880","created_at":"2026-07-05T11:01:58Z"},{"alias_kind":"arxiv_version","alias_value":"2505.07880v1","created_at":"2026-07-05T11:01:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2505.07880","created_at":"2026-07-05T11:01:58Z"},{"alias_kind":"pith_short_12","alias_value":"RLA7PAJ2GMWD","created_at":"2026-07-05T11:01:58Z"},{"alias_kind":"pith_short_16","alias_value":"RLA7PAJ2GMWDATUJ","created_at":"2026-07-05T11:01:58Z"},{"alias_kind":"pith_short_8","alias_value":"RLA7PAJ2","created_at":"2026-07-05T11:01:58Z"}],"graph_snapshots":[{"event_id":"sha256:6fc9f91801018b56c0b315e0c1634e1fed4073c9dca46e3ff54e736de87e3db1","target":"graph","created_at":"2026-07-05T11:01:58Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2505.07880/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present a new empirical Type Ia supernova (SN Ia) model with three chromatic flux variation templates: one phase dependent and two phase independent. No underlying dust extinction model or patterns of intrinsic variability are assumed. Implemented with Stan and trained using spectrally binned Nearby Supernova Factory spectrophotometry, we examine this model's 2D, phase-independent flux variation space using two motivated basis representations. In both, the first phase-independent template captures variation that appears dust-like, while the second captures a combination of effectively intri","authors_text":"A. G. Kim, B. Hayden, C. Aragon, C. Baltay, C. Buton, C. Saunders, C. Tao, D. Fouchez, D. K\\\"usters, D. Rabinowitz, D. Rubin, E. Gangler, E. Pecontal, F. Mondon, G. Aldering, Jared Hand, J. Nordin, K. A. Ponder, K. Boone, K. Runge, Mitchell Karmen, M. Kowalski, M. Rigault, M. Vincenzi (The Nearby Supernova Factory), N. Suzuki, P. Antilogus, P.-F. L\\'eget, R. C. Thomas, R. Gupta, R. Pain, R. Pereira, S. Bailey, S. Bongard, S. Dixon, S. Perlmutter, S. Taubenberger, W. Hillebrandt, Y. Copin","cross_cats":["astro-ph.CO"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-05-10T14:42:33Z","title":"An Agnostic Approach to Building Empirical Type Ia Supernova Light Curves: Evidence for Intrinsic Chromatic Flux Variation Using Nearby Supernova Factory Data"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.07880","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:8e10db9e0d05260cd16bfb4b54e36dbfb3320af3b96ea494d1c3839813549d4d","target":"record","created_at":"2026-07-05T11:01:58Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"b04b0ec0936bfe1851956c9e874f3071e01e143bd07015e85f1ed043a8717652","cross_cats_sorted":["astro-ph.CO"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-05-10T14:42:33Z","title_canon_sha256":"d1abbcf8f343202cbd4adcd641b4d4d9489260b4029e40d7e000569d14ed0f01"},"schema_version":"1.0","source":{"id":"2505.07880","kind":"arxiv","version":1}},"canonical_sha256":"8ac1f7813a332c304e89f842d3bfabd4d78581754a582a0f6f6a06b2e4ca21ed","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8ac1f7813a332c304e89f842d3bfabd4d78581754a582a0f6f6a06b2e4ca21ed","first_computed_at":"2026-07-05T11:01:58.905681Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:01:58.905681Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gUMI5rzKEHV5/tBaH1z032e/ot5mYw9ZuQBGekXKKmf5ADz4mG0aCEbfRmZ4b90BwiMq99FQsmYGy6W8Mk1OCA==","signature_status":"signed_v1","signed_at":"2026-07-05T11:01:58.906150Z","signed_message":"canonical_sha256_bytes"},"source_id":"2505.07880","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8e10db9e0d05260cd16bfb4b54e36dbfb3320af3b96ea494d1c3839813549d4d","sha256:6fc9f91801018b56c0b315e0c1634e1fed4073c9dca46e3ff54e736de87e3db1"],"state_sha256":"4420c074158e721992e1f6171c03a34128a23d67d6fe122e9c437daf8072f3ed"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"C6PFtRHxj2putEQ/Z1gR8bwHs3unILBc1W7xtgs7jhzTD2a6IKGFCrXzlEM3CDoghaFEHv7q9y22aI5V6qqdCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-18T04:43:57.428980Z","bundle_sha256":"adedc7f72ea584b630131fc2c4e80a075af20f3776256a28483ed4953f04efe1"}}