{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:LEESJ7OGRLAAE3XCD2K74DP3V7","short_pith_number":"pith:LEESJ7OG","canonical_record":{"source":{"id":"2606.23216","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2026-06-22T12:05:40Z","cross_cats_sorted":[],"title_canon_sha256":"b462077c27c55a05bf5e306136b124e531d6d3b86fc4325de643716dc325d80a","abstract_canon_sha256":"6d18352053d46e4607f4725c08f6d0637e9e799167c63fa002b140276bf9e329"},"schema_version":"1.0"},"canonical_sha256":"590924fdc68ac0026ee21e95fe0dfbafdf1632488a92b52e342d5b2425f42f36","source":{"kind":"arxiv","id":"2606.23216","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.23216","created_at":"2026-06-23T03:14:14Z"},{"alias_kind":"arxiv_version","alias_value":"2606.23216v1","created_at":"2026-06-23T03:14:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.23216","created_at":"2026-06-23T03:14:14Z"},{"alias_kind":"pith_short_12","alias_value":"LEESJ7OGRLAA","created_at":"2026-06-23T03:14:14Z"},{"alias_kind":"pith_short_16","alias_value":"LEESJ7OGRLAAE3XC","created_at":"2026-06-23T03:14:14Z"},{"alias_kind":"pith_short_8","alias_value":"LEESJ7OG","created_at":"2026-06-23T03:14:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:LEESJ7OGRLAAE3XCD2K74DP3V7","target":"record","payload":{"canonical_record":{"source":{"id":"2606.23216","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2026-06-22T12:05:40Z","cross_cats_sorted":[],"title_canon_sha256":"b462077c27c55a05bf5e306136b124e531d6d3b86fc4325de643716dc325d80a","abstract_canon_sha256":"6d18352053d46e4607f4725c08f6d0637e9e799167c63fa002b140276bf9e329"},"schema_version":"1.0"},"canonical_sha256":"590924fdc68ac0026ee21e95fe0dfbafdf1632488a92b52e342d5b2425f42f36","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-23T03:14:14.035427Z","signature_b64":"+2oL+2WJeW7050AXxHAwXDtD6iof2Mf+3zjFMtl67mD1Ne7QlwWG/tD8rsLNqVdxQmxjaocCVoVsyW+Jlhu4Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"590924fdc68ac0026ee21e95fe0dfbafdf1632488a92b52e342d5b2425f42f36","last_reissued_at":"2026-06-23T03:14:14.035038Z","signature_status":"signed_v1","first_computed_at":"2026-06-23T03:14:14.035038Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2606.23216","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":"2026-06-23T03:14:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RzQmk6CkUki59hhp9kzG/pjdtzQ9EI9AL4k7VjVOirgLUYQrnKI57hjHnFB3V6Hy5+q8mhUVWixc9g4oGy2aCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T06:51:40.119232Z"},"content_sha256":"7eb26f5800713b1ed289062051414cf93e69cb462b7e2a460c77d1f790800692","schema_version":"1.0","event_id":"sha256:7eb26f5800713b1ed289062051414cf93e69cb462b7e2a460c77d1f790800692"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:LEESJ7OGRLAAE3XCD2K74DP3V7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spatially resolved star formation history of Sextans dSph","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Andr\\'es E. Piatti","submitted_at":"2026-06-22T12:05:40Z","abstract_excerpt":"We present a spatially resolved archaeological reconstruction of the Sextans dwarf spheroidal (dSph) galaxy using deep DECam wide-field photometry and the PANCAKE CMD-fitting code. By analyzing the star formation history (SFH) and age-metallicity relationship (AMR) across four radial zones, namely: core, ring, outer body, and outskirts, we find that Sextans is a composite system formed through a minor merger approximately 13 Gyr ago. Our results reveal an inverse metallicity gradient: a primitive, metal-poor host (the current core) surrounded by a more massive, chemically evolved envelope ($\\D"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.23216","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/2606.23216/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":"2026-06-23T03:14:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lug5JjTY+R8brZLpjxnylzg8AHStLLsjxaWZDlD3u4eO9bRUV9Pt344ZPw0KCiGxYy8xfrGZoK4pRC+7/JFEBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T06:51:40.119644Z"},"content_sha256":"1de2794c580f071224225f6ad310b0b94c54476277f90b6ad553c162e7f3ef21","schema_version":"1.0","event_id":"sha256:1de2794c580f071224225f6ad310b0b94c54476277f90b6ad553c162e7f3ef21"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LEESJ7OGRLAAE3XCD2K74DP3V7/bundle.json","state_url":"https://pith.science/pith/LEESJ7OGRLAAE3XCD2K74DP3V7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LEESJ7OGRLAAE3XCD2K74DP3V7/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":"2026-06-27T06:51:40Z","links":{"resolver":"https://pith.science/pith/LEESJ7OGRLAAE3XCD2K74DP3V7","bundle":"https://pith.science/pith/LEESJ7OGRLAAE3XCD2K74DP3V7/bundle.json","state":"https://pith.science/pith/LEESJ7OGRLAAE3XCD2K74DP3V7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LEESJ7OGRLAAE3XCD2K74DP3V7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:LEESJ7OGRLAAE3XCD2K74DP3V7","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":"6d18352053d46e4607f4725c08f6d0637e9e799167c63fa002b140276bf9e329","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2026-06-22T12:05:40Z","title_canon_sha256":"b462077c27c55a05bf5e306136b124e531d6d3b86fc4325de643716dc325d80a"},"schema_version":"1.0","source":{"id":"2606.23216","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.23216","created_at":"2026-06-23T03:14:14Z"},{"alias_kind":"arxiv_version","alias_value":"2606.23216v1","created_at":"2026-06-23T03:14:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.23216","created_at":"2026-06-23T03:14:14Z"},{"alias_kind":"pith_short_12","alias_value":"LEESJ7OGRLAA","created_at":"2026-06-23T03:14:14Z"},{"alias_kind":"pith_short_16","alias_value":"LEESJ7OGRLAAE3XC","created_at":"2026-06-23T03:14:14Z"},{"alias_kind":"pith_short_8","alias_value":"LEESJ7OG","created_at":"2026-06-23T03:14:14Z"}],"graph_snapshots":[{"event_id":"sha256:1de2794c580f071224225f6ad310b0b94c54476277f90b6ad553c162e7f3ef21","target":"graph","created_at":"2026-06-23T03:14:14Z","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/2606.23216/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present a spatially resolved archaeological reconstruction of the Sextans dwarf spheroidal (dSph) galaxy using deep DECam wide-field photometry and the PANCAKE CMD-fitting code. By analyzing the star formation history (SFH) and age-metallicity relationship (AMR) across four radial zones, namely: core, ring, outer body, and outskirts, we find that Sextans is a composite system formed through a minor merger approximately 13 Gyr ago. Our results reveal an inverse metallicity gradient: a primitive, metal-poor host (the current core) surrounded by a more massive, chemically evolved envelope ($\\D","authors_text":"Andr\\'es E. Piatti","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2026-06-22T12:05:40Z","title":"Spatially resolved star formation history of Sextans dSph"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.23216","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":"sha256:7eb26f5800713b1ed289062051414cf93e69cb462b7e2a460c77d1f790800692","target":"record","created_at":"2026-06-23T03:14:14Z","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":"6d18352053d46e4607f4725c08f6d0637e9e799167c63fa002b140276bf9e329","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2026-06-22T12:05:40Z","title_canon_sha256":"b462077c27c55a05bf5e306136b124e531d6d3b86fc4325de643716dc325d80a"},"schema_version":"1.0","source":{"id":"2606.23216","kind":"arxiv","version":1}},"canonical_sha256":"590924fdc68ac0026ee21e95fe0dfbafdf1632488a92b52e342d5b2425f42f36","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"590924fdc68ac0026ee21e95fe0dfbafdf1632488a92b52e342d5b2425f42f36","first_computed_at":"2026-06-23T03:14:14.035038Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-23T03:14:14.035038Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+2oL+2WJeW7050AXxHAwXDtD6iof2Mf+3zjFMtl67mD1Ne7QlwWG/tD8rsLNqVdxQmxjaocCVoVsyW+Jlhu4Cg==","signature_status":"signed_v1","signed_at":"2026-06-23T03:14:14.035427Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.23216","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7eb26f5800713b1ed289062051414cf93e69cb462b7e2a460c77d1f790800692","sha256:1de2794c580f071224225f6ad310b0b94c54476277f90b6ad553c162e7f3ef21"],"state_sha256":"2d88a002203233e8600c1320cc5b335ee7f431cd39068d67882fe993f1c49801"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZYeEcrHKc9ROhD17/ruTl9NDbakzh0gs3giVK9gChOafoIOOdx9514EbGtQzMcy0PH3XW3bCA6HQtVdG1AmlAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-27T06:51:40.121694Z","bundle_sha256":"8e21c61d3ec73d754226df090f702e3f6348422c6ae61083174d0ec328f57e40"}}