{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:B4LEEUIBQ45KFPXHF6QC4MHPVL","short_pith_number":"pith:B4LEEUIB","canonical_record":{"source":{"id":"1901.00874","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-01-03T19:00:39Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"036597b291c2c80482c7b03f656fd914c49feb9a4d1f561351c040f17f1cc9c6","abstract_canon_sha256":"38b8349ab76c14c91786eb6fe90ad98e018ddce5f3602691d3cbd88fa0f2db18"},"schema_version":"1.0"},"canonical_sha256":"0f16425101873aa2bee72fa02e30efaae9fff39bcce6454caa9721c912af8be6","source":{"kind":"arxiv","id":"1901.00874","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.00874","created_at":"2026-05-17T23:50:56Z"},{"alias_kind":"arxiv_version","alias_value":"1901.00874v1","created_at":"2026-05-17T23:50:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.00874","created_at":"2026-05-17T23:50:56Z"},{"alias_kind":"pith_short_12","alias_value":"B4LEEUIBQ45K","created_at":"2026-05-18T12:33:12Z"},{"alias_kind":"pith_short_16","alias_value":"B4LEEUIBQ45KFPXH","created_at":"2026-05-18T12:33:12Z"},{"alias_kind":"pith_short_8","alias_value":"B4LEEUIB","created_at":"2026-05-18T12:33:12Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:B4LEEUIBQ45KFPXHF6QC4MHPVL","target":"record","payload":{"canonical_record":{"source":{"id":"1901.00874","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-01-03T19:00:39Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"036597b291c2c80482c7b03f656fd914c49feb9a4d1f561351c040f17f1cc9c6","abstract_canon_sha256":"38b8349ab76c14c91786eb6fe90ad98e018ddce5f3602691d3cbd88fa0f2db18"},"schema_version":"1.0"},"canonical_sha256":"0f16425101873aa2bee72fa02e30efaae9fff39bcce6454caa9721c912af8be6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:50:56.251262Z","signature_b64":"tYpvVAf6BHfHF7PojKJtNxclD6yRkSpfmaVRtzgJlvwi/sxQ+ptt9xr2CNf1YeOJ6GuNz4dVE/pN2ERb4kHdBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0f16425101873aa2bee72fa02e30efaae9fff39bcce6454caa9721c912af8be6","last_reissued_at":"2026-05-17T23:50:56.250580Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:50:56.250580Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1901.00874","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":"2026-05-17T23:50:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aWNkPrrj4CASzbPQ4J+JpGibb3fajiqk/0dWgNjoDQ14dDpreK42r/pnEWh+wUt0kW1V9ws1xFyd+pT5Sa6sBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-21T18:21:49.705895Z"},"content_sha256":"35423031c8ef1a71ee2eb5e25396e3c5e6daa5b02aff6b8f16bc213647c02a7b","schema_version":"1.0","event_id":"sha256:35423031c8ef1a71ee2eb5e25396e3c5e6daa5b02aff6b8f16bc213647c02a7b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:B4LEEUIBQ45KFPXHF6QC4MHPVL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"ZTF 18aaqeasu (SN 2018byg): A Massive Helium-shell Double Detonation on a Sub-Chandrasekhar Mass White Dwarf","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"Abigail Polin, Adam A. Miller, Anna Y. Q. Ho, Christoffer Fremling, Christopher Cannella, David Hale, David L. Shupe, Eric C. Bellm, Frank J. Masci, Jacob E. Jencson, Kevin B. Burdge, Kishalay De, Lars Bildsten, Mansi M. Kasliwal, Maria T. Patterson, Matthew J. Graham, Michael Feeney, Nadia Blagorodnova, Peter E. Nugent, Reed L. Riddle, Richard G. Dekany, Roger M. Smith, Russ R. Laher, S. Bradley Cenko, Scott M. Adams, S. R. Kulkarni, Umaa Rebbapragada","submitted_at":"2019-01-03T19:00:39Z","abstract_excerpt":"The detonation of a helium shell on a white dwarf has been proposed as a possible explosion triggering mechanism for Type Ia supernovae. Here, we report ZTF 18aaqeasu (SN 2018byg/ATLAS 18pqq), a peculiar Type I supernova, consistent with being a helium-shell double-detonation. With a rise time of $\\approx 18$ days from explosion, the transient reached a peak absolute magnitude of $M_R \\approx -18.2$ mag, exhibiting a light curve akin to sub-luminous SN 1991bg-like Type Ia supernovae, albeit with an unusually steep increase in brightness within a week from explosion. Spectra taken near peak lig"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.00874","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":""},"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":"2026-05-17T23:50:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JuhM3UeUJBtT+ztseNZ4IoE/Mt3svK1n0hWxBv0wgoMoMKf9mFA6H1npGJdTFF0eeD9pqDK4B1ldkzqMP3VdDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-21T18:21:49.706248Z"},"content_sha256":"b4af5fafc6ce840d9f179c554f2d7a3748ae1a5acf2b78c8e17e5233ea4b13b2","schema_version":"1.0","event_id":"sha256:b4af5fafc6ce840d9f179c554f2d7a3748ae1a5acf2b78c8e17e5233ea4b13b2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/B4LEEUIBQ45KFPXHF6QC4MHPVL/bundle.json","state_url":"https://pith.science/pith/B4LEEUIBQ45KFPXHF6QC4MHPVL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/B4LEEUIBQ45KFPXHF6QC4MHPVL/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":"2026-07-21T18:21:49Z","links":{"resolver":"https://pith.science/pith/B4LEEUIBQ45KFPXHF6QC4MHPVL","bundle":"https://pith.science/pith/B4LEEUIBQ45KFPXHF6QC4MHPVL/bundle.json","state":"https://pith.science/pith/B4LEEUIBQ45KFPXHF6QC4MHPVL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/B4LEEUIBQ45KFPXHF6QC4MHPVL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:B4LEEUIBQ45KFPXHF6QC4MHPVL","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":"38b8349ab76c14c91786eb6fe90ad98e018ddce5f3602691d3cbd88fa0f2db18","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-01-03T19:00:39Z","title_canon_sha256":"036597b291c2c80482c7b03f656fd914c49feb9a4d1f561351c040f17f1cc9c6"},"schema_version":"1.0","source":{"id":"1901.00874","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.00874","created_at":"2026-05-17T23:50:56Z"},{"alias_kind":"arxiv_version","alias_value":"1901.00874v1","created_at":"2026-05-17T23:50:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.00874","created_at":"2026-05-17T23:50:56Z"},{"alias_kind":"pith_short_12","alias_value":"B4LEEUIBQ45K","created_at":"2026-05-18T12:33:12Z"},{"alias_kind":"pith_short_16","alias_value":"B4LEEUIBQ45KFPXH","created_at":"2026-05-18T12:33:12Z"},{"alias_kind":"pith_short_8","alias_value":"B4LEEUIB","created_at":"2026-05-18T12:33:12Z"}],"graph_snapshots":[{"event_id":"sha256:b4af5fafc6ce840d9f179c554f2d7a3748ae1a5acf2b78c8e17e5233ea4b13b2","target":"graph","created_at":"2026-05-17T23:50:56Z","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"},"paper":{"abstract_excerpt":"The detonation of a helium shell on a white dwarf has been proposed as a possible explosion triggering mechanism for Type Ia supernovae. Here, we report ZTF 18aaqeasu (SN 2018byg/ATLAS 18pqq), a peculiar Type I supernova, consistent with being a helium-shell double-detonation. With a rise time of $\\approx 18$ days from explosion, the transient reached a peak absolute magnitude of $M_R \\approx -18.2$ mag, exhibiting a light curve akin to sub-luminous SN 1991bg-like Type Ia supernovae, albeit with an unusually steep increase in brightness within a week from explosion. Spectra taken near peak lig","authors_text":"Abigail Polin, Adam A. Miller, Anna Y. Q. Ho, Christoffer Fremling, Christopher Cannella, David Hale, David L. Shupe, Eric C. Bellm, Frank J. Masci, Jacob E. Jencson, Kevin B. Burdge, Kishalay De, Lars Bildsten, Mansi M. Kasliwal, Maria T. Patterson, Matthew J. Graham, Michael Feeney, Nadia Blagorodnova, Peter E. Nugent, Reed L. Riddle, Richard G. Dekany, Roger M. Smith, Russ R. Laher, S. Bradley Cenko, Scott M. Adams, S. R. Kulkarni, Umaa Rebbapragada","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-01-03T19:00:39Z","title":"ZTF 18aaqeasu (SN 2018byg): A Massive Helium-shell Double Detonation on a Sub-Chandrasekhar Mass White Dwarf"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.00874","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":"sha256:35423031c8ef1a71ee2eb5e25396e3c5e6daa5b02aff6b8f16bc213647c02a7b","target":"record","created_at":"2026-05-17T23:50:56Z","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":"38b8349ab76c14c91786eb6fe90ad98e018ddce5f3602691d3cbd88fa0f2db18","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-01-03T19:00:39Z","title_canon_sha256":"036597b291c2c80482c7b03f656fd914c49feb9a4d1f561351c040f17f1cc9c6"},"schema_version":"1.0","source":{"id":"1901.00874","kind":"arxiv","version":1}},"canonical_sha256":"0f16425101873aa2bee72fa02e30efaae9fff39bcce6454caa9721c912af8be6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0f16425101873aa2bee72fa02e30efaae9fff39bcce6454caa9721c912af8be6","first_computed_at":"2026-05-17T23:50:56.250580Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:50:56.250580Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tYpvVAf6BHfHF7PojKJtNxclD6yRkSpfmaVRtzgJlvwi/sxQ+ptt9xr2CNf1YeOJ6GuNz4dVE/pN2ERb4kHdBA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:50:56.251262Z","signed_message":"canonical_sha256_bytes"},"source_id":"1901.00874","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:35423031c8ef1a71ee2eb5e25396e3c5e6daa5b02aff6b8f16bc213647c02a7b","sha256:b4af5fafc6ce840d9f179c554f2d7a3748ae1a5acf2b78c8e17e5233ea4b13b2"],"state_sha256":"a9c2f84bf34c9babc45829fb09c551190c953455f0b715a51e3e141923f08014"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"39Plijjq+N1ytY7MbpDqUI+vMsnf90AVOL+tMVM8EKQVF1TxdEM0F3d4EnofnD/5PDWHz6Ww3DFXM49bcTAiAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-21T18:21:49.708862Z","bundle_sha256":"0928e63090225851e644d2dea17eb4e3da414fccd106475180c031a12324fe57"}}