{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:SOCO6UWSZ2V4EFW6P7OW2LB65D","short_pith_number":"pith:SOCO6UWS","canonical_record":{"source":{"id":"2606.17802","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2026-06-16T11:27:20Z","cross_cats_sorted":[],"title_canon_sha256":"2085ac25f4409d70fc5e71ec5d3b20bfe62c9e85e0077ee82a00f812b4be8d92","abstract_canon_sha256":"7d3b80e9c40cbf9fb868788b0f58bf2e0986b0d813958e089a9999dfe4805048"},"schema_version":"1.0"},"canonical_sha256":"9384ef52d2ceabc216de7fdd6d2c3ee8c58d122fd47a10f4eb4569b7016c8d40","source":{"kind":"arxiv","id":"2606.17802","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.17802","created_at":"2026-06-19T16:10:22Z"},{"alias_kind":"arxiv_version","alias_value":"2606.17802v1","created_at":"2026-06-19T16:10:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.17802","created_at":"2026-06-19T16:10:22Z"},{"alias_kind":"pith_short_12","alias_value":"SOCO6UWSZ2V4","created_at":"2026-06-19T16:10:22Z"},{"alias_kind":"pith_short_16","alias_value":"SOCO6UWSZ2V4EFW6","created_at":"2026-06-19T16:10:22Z"},{"alias_kind":"pith_short_8","alias_value":"SOCO6UWS","created_at":"2026-06-19T16:10:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:SOCO6UWSZ2V4EFW6P7OW2LB65D","target":"record","payload":{"canonical_record":{"source":{"id":"2606.17802","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2026-06-16T11:27:20Z","cross_cats_sorted":[],"title_canon_sha256":"2085ac25f4409d70fc5e71ec5d3b20bfe62c9e85e0077ee82a00f812b4be8d92","abstract_canon_sha256":"7d3b80e9c40cbf9fb868788b0f58bf2e0986b0d813958e089a9999dfe4805048"},"schema_version":"1.0"},"canonical_sha256":"9384ef52d2ceabc216de7fdd6d2c3ee8c58d122fd47a10f4eb4569b7016c8d40","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-19T16:10:22.150656Z","signature_b64":"UMPGQYM9or/GiYbtPSn8CzUbGgEQGTh4J/xwT0eROfGc3k1PlDfJwFKw0k9bv5okBepaqnLFUC0vdqfFc01LCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9384ef52d2ceabc216de7fdd6d2c3ee8c58d122fd47a10f4eb4569b7016c8d40","last_reissued_at":"2026-06-19T16:10:22.150249Z","signature_status":"signed_v1","first_computed_at":"2026-06-19T16:10:22.150249Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2606.17802","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":"2026-06-19T16:10:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EvNX80/FLy7IGqGPSxkosgvRi9a6rbogcUeZAClvM0ivb/jAek3foDtFhKYpqOscccKugzCgZomYUwMH4YtZAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T07:41:00.923427Z"},"content_sha256":"b32873d482863beea53b1392c2df221f4bc592047a9c4ff8945c7df898e6d674","schema_version":"1.0","event_id":"sha256:b32873d482863beea53b1392c2df221f4bc592047a9c4ff8945c7df898e6d674"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:SOCO6UWSZ2V4EFW6P7OW2LB65D","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Two-population model of type Ia supernovae and their associations with host galaxies in ZTF DR2","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Jens Hjorth, Lucas Hallgren, Rados{\\l}aw Wojtak","submitted_at":"2026-06-16T11:27:20Z","abstract_excerpt":"We constrain type Ia supernova intrinsic properties, extinction, and probabilistic supernova-host associations using the volume-limited sample from the Zwicky Transient Factory DR2, the largest selection-free data set of type Ia supernovae to date. We employ Bayesian hierarchical modelling to jointly analyse the distribution of SALT2 light-curve parameters and global host-galaxy properties (stellar mass and rest-frame g-z colour). The adopted model is a mixture of distributions representing two supernova populations corresponding to two distinct modes of the stretch-parameter distribution, and"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.17802","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/2606.17802/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":"2026-06-19T16:10:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SetIZnpJ51fKeiT5QYvb152kbrYwiEZ7jgQ5jtAiVkEPHiFDtK4OEXiW2TYbsKDLS47QyqagcbZWyQ4ud5qZAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T07:41:00.923795Z"},"content_sha256":"ffe78d29d62742c074d1e18ea0b411b3bf6560f1c638faca129ffea26680f33f","schema_version":"1.0","event_id":"sha256:ffe78d29d62742c074d1e18ea0b411b3bf6560f1c638faca129ffea26680f33f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SOCO6UWSZ2V4EFW6P7OW2LB65D/bundle.json","state_url":"https://pith.science/pith/SOCO6UWSZ2V4EFW6P7OW2LB65D/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SOCO6UWSZ2V4EFW6P7OW2LB65D/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":"2026-06-27T07:41:00Z","links":{"resolver":"https://pith.science/pith/SOCO6UWSZ2V4EFW6P7OW2LB65D","bundle":"https://pith.science/pith/SOCO6UWSZ2V4EFW6P7OW2LB65D/bundle.json","state":"https://pith.science/pith/SOCO6UWSZ2V4EFW6P7OW2LB65D/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SOCO6UWSZ2V4EFW6P7OW2LB65D/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:SOCO6UWSZ2V4EFW6P7OW2LB65D","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":"7d3b80e9c40cbf9fb868788b0f58bf2e0986b0d813958e089a9999dfe4805048","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2026-06-16T11:27:20Z","title_canon_sha256":"2085ac25f4409d70fc5e71ec5d3b20bfe62c9e85e0077ee82a00f812b4be8d92"},"schema_version":"1.0","source":{"id":"2606.17802","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.17802","created_at":"2026-06-19T16:10:22Z"},{"alias_kind":"arxiv_version","alias_value":"2606.17802v1","created_at":"2026-06-19T16:10:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.17802","created_at":"2026-06-19T16:10:22Z"},{"alias_kind":"pith_short_12","alias_value":"SOCO6UWSZ2V4","created_at":"2026-06-19T16:10:22Z"},{"alias_kind":"pith_short_16","alias_value":"SOCO6UWSZ2V4EFW6","created_at":"2026-06-19T16:10:22Z"},{"alias_kind":"pith_short_8","alias_value":"SOCO6UWS","created_at":"2026-06-19T16:10:22Z"}],"graph_snapshots":[{"event_id":"sha256:ffe78d29d62742c074d1e18ea0b411b3bf6560f1c638faca129ffea26680f33f","target":"graph","created_at":"2026-06-19T16:10:22Z","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/2606.17802/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We constrain type Ia supernova intrinsic properties, extinction, and probabilistic supernova-host associations using the volume-limited sample from the Zwicky Transient Factory DR2, the largest selection-free data set of type Ia supernovae to date. We employ Bayesian hierarchical modelling to jointly analyse the distribution of SALT2 light-curve parameters and global host-galaxy properties (stellar mass and rest-frame g-z colour). The adopted model is a mixture of distributions representing two supernova populations corresponding to two distinct modes of the stretch-parameter distribution, and","authors_text":"Jens Hjorth, Lucas Hallgren, Rados{\\l}aw Wojtak","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2026-06-16T11:27:20Z","title":"Two-population model of type Ia supernovae and their associations with host galaxies in ZTF DR2"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.17802","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:b32873d482863beea53b1392c2df221f4bc592047a9c4ff8945c7df898e6d674","target":"record","created_at":"2026-06-19T16:10:22Z","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":"7d3b80e9c40cbf9fb868788b0f58bf2e0986b0d813958e089a9999dfe4805048","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2026-06-16T11:27:20Z","title_canon_sha256":"2085ac25f4409d70fc5e71ec5d3b20bfe62c9e85e0077ee82a00f812b4be8d92"},"schema_version":"1.0","source":{"id":"2606.17802","kind":"arxiv","version":1}},"canonical_sha256":"9384ef52d2ceabc216de7fdd6d2c3ee8c58d122fd47a10f4eb4569b7016c8d40","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9384ef52d2ceabc216de7fdd6d2c3ee8c58d122fd47a10f4eb4569b7016c8d40","first_computed_at":"2026-06-19T16:10:22.150249Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-19T16:10:22.150249Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"UMPGQYM9or/GiYbtPSn8CzUbGgEQGTh4J/xwT0eROfGc3k1PlDfJwFKw0k9bv5okBepaqnLFUC0vdqfFc01LCg==","signature_status":"signed_v1","signed_at":"2026-06-19T16:10:22.150656Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.17802","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b32873d482863beea53b1392c2df221f4bc592047a9c4ff8945c7df898e6d674","sha256:ffe78d29d62742c074d1e18ea0b411b3bf6560f1c638faca129ffea26680f33f"],"state_sha256":"8b5041c0786a2bf687ea4f8dd97c33caff76c7fb5b445c72d1d86f10992337e3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"o3pgSvC5q9JxGfBP6MQNpdSiX/ARYHZuQvPkbdm5jenNN5dszdHhwtZJRiE+nFIdZoLxzZkgizqEa1NMZrvLCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-27T07:41:00.925818Z","bundle_sha256":"30929083a231501040ff323dda28eba0da8766f4377ef05fbf545dcfe186139d"}}