{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:HHWCFO5FBRPAAJB2OCVD7HM3QX","short_pith_number":"pith:HHWCFO5F","canonical_record":{"source":{"id":"1606.00843","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-06-02T20:00:11Z","cross_cats_sorted":[],"title_canon_sha256":"8239ccf2fb335df87d6816d700dfdaba83f4b0d518f82613ef324be5dc2e37c4","abstract_canon_sha256":"3fdbffcb0e8eef668a17289e3017fbe4c9bda440febfdd601172f49db141f4cb"},"schema_version":"1.0"},"canonical_sha256":"39ec22bba50c5e00243a70aa3f9d9b85feae656c9c701dd684921520ba7c8ba7","source":{"kind":"arxiv","id":"1606.00843","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1606.00843","created_at":"2026-05-18T01:10:29Z"},{"alias_kind":"arxiv_version","alias_value":"1606.00843v1","created_at":"2026-05-18T01:10:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1606.00843","created_at":"2026-05-18T01:10:29Z"},{"alias_kind":"pith_short_12","alias_value":"HHWCFO5FBRPA","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_16","alias_value":"HHWCFO5FBRPAAJB2","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_8","alias_value":"HHWCFO5F","created_at":"2026-05-18T12:30:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:HHWCFO5FBRPAAJB2OCVD7HM3QX","target":"record","payload":{"canonical_record":{"source":{"id":"1606.00843","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-06-02T20:00:11Z","cross_cats_sorted":[],"title_canon_sha256":"8239ccf2fb335df87d6816d700dfdaba83f4b0d518f82613ef324be5dc2e37c4","abstract_canon_sha256":"3fdbffcb0e8eef668a17289e3017fbe4c9bda440febfdd601172f49db141f4cb"},"schema_version":"1.0"},"canonical_sha256":"39ec22bba50c5e00243a70aa3f9d9b85feae656c9c701dd684921520ba7c8ba7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:10:29.324362Z","signature_b64":"eO3BoR4QSuCpRkz6x59PUTtLPpE81VpsxMR19xOzd0w0yvEZNVTs+XOGNT7fh9lmeIPH8xZo4dSmZ8Yh/BwKCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"39ec22bba50c5e00243a70aa3f9d9b85feae656c9c701dd684921520ba7c8ba7","last_reissued_at":"2026-05-18T01:10:29.323881Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:10:29.323881Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1606.00843","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":"2026-05-18T01:10:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ja51A+edwbYKwXiM1eRetR2UaI+hetVHh/KfXDYrI86sGDSy5NcvtKbcIgb24SxpHhYIkEOjCy1mbvB/JPL+Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T09:43:57.750295Z"},"content_sha256":"42d6ab689d5e942005723302ae57c182a88670609be8331871f68929f1046a36","schema_version":"1.0","event_id":"sha256:42d6ab689d5e942005723302ae57c182a88670609be8331871f68929f1046a36"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:HHWCFO5FBRPAAJB2OCVD7HM3QX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Massive Double White Dwarfs and the AM CVn Birthrate","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Gianninas, Craig O. Heinke, M. A. Agueros, Mukremin Kilic, P. Benni, Warren R. Brown","submitted_at":"2016-06-02T20:00:11Z","abstract_excerpt":"We present Chandra and Swift X-ray observations of four extremely low-mass (ELM) white dwarfs with massive companions. We place stringent limits on X-ray emission from all four systems, indicating that neutron star companions are extremely unlikely and that the companions are almost certainly white dwarfs. Given the observed orbital periods and radial velocity amplitudes, the total masses of these binaries are greater than 1.02 to 1.39 Msun. The extreme mass ratios between the two components make it unlikely that these binary white dwarfs will merge and explode as Type Ia or underluminous supe"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1606.00843","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":"2026-05-18T01:10:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ne4wVI8qH0B6C0ZHw4DuzVU2PTeniwbpr8cxyVKrULkESo0AkCvifmTY2lcQrQCNfUfFSZyt1cMXTurziZnwDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T09:43:57.750651Z"},"content_sha256":"2164726e19065e80d14c2453a25ce19b3443822054610ee784223433d8267b47","schema_version":"1.0","event_id":"sha256:2164726e19065e80d14c2453a25ce19b3443822054610ee784223433d8267b47"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HHWCFO5FBRPAAJB2OCVD7HM3QX/bundle.json","state_url":"https://pith.science/pith/HHWCFO5FBRPAAJB2OCVD7HM3QX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HHWCFO5FBRPAAJB2OCVD7HM3QX/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":"2026-06-02T09:43:57Z","links":{"resolver":"https://pith.science/pith/HHWCFO5FBRPAAJB2OCVD7HM3QX","bundle":"https://pith.science/pith/HHWCFO5FBRPAAJB2OCVD7HM3QX/bundle.json","state":"https://pith.science/pith/HHWCFO5FBRPAAJB2OCVD7HM3QX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HHWCFO5FBRPAAJB2OCVD7HM3QX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:HHWCFO5FBRPAAJB2OCVD7HM3QX","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":"3fdbffcb0e8eef668a17289e3017fbe4c9bda440febfdd601172f49db141f4cb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-06-02T20:00:11Z","title_canon_sha256":"8239ccf2fb335df87d6816d700dfdaba83f4b0d518f82613ef324be5dc2e37c4"},"schema_version":"1.0","source":{"id":"1606.00843","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1606.00843","created_at":"2026-05-18T01:10:29Z"},{"alias_kind":"arxiv_version","alias_value":"1606.00843v1","created_at":"2026-05-18T01:10:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1606.00843","created_at":"2026-05-18T01:10:29Z"},{"alias_kind":"pith_short_12","alias_value":"HHWCFO5FBRPA","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_16","alias_value":"HHWCFO5FBRPAAJB2","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_8","alias_value":"HHWCFO5F","created_at":"2026-05-18T12:30:19Z"}],"graph_snapshots":[{"event_id":"sha256:2164726e19065e80d14c2453a25ce19b3443822054610ee784223433d8267b47","target":"graph","created_at":"2026-05-18T01:10:29Z","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":"We present Chandra and Swift X-ray observations of four extremely low-mass (ELM) white dwarfs with massive companions. We place stringent limits on X-ray emission from all four systems, indicating that neutron star companions are extremely unlikely and that the companions are almost certainly white dwarfs. Given the observed orbital periods and radial velocity amplitudes, the total masses of these binaries are greater than 1.02 to 1.39 Msun. The extreme mass ratios between the two components make it unlikely that these binary white dwarfs will merge and explode as Type Ia or underluminous supe","authors_text":"A. Gianninas, Craig O. Heinke, M. A. Agueros, Mukremin Kilic, P. Benni, Warren R. Brown","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-06-02T20:00:11Z","title":"Massive Double White Dwarfs and the AM CVn Birthrate"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1606.00843","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":"sha256:42d6ab689d5e942005723302ae57c182a88670609be8331871f68929f1046a36","target":"record","created_at":"2026-05-18T01:10:29Z","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":"3fdbffcb0e8eef668a17289e3017fbe4c9bda440febfdd601172f49db141f4cb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-06-02T20:00:11Z","title_canon_sha256":"8239ccf2fb335df87d6816d700dfdaba83f4b0d518f82613ef324be5dc2e37c4"},"schema_version":"1.0","source":{"id":"1606.00843","kind":"arxiv","version":1}},"canonical_sha256":"39ec22bba50c5e00243a70aa3f9d9b85feae656c9c701dd684921520ba7c8ba7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"39ec22bba50c5e00243a70aa3f9d9b85feae656c9c701dd684921520ba7c8ba7","first_computed_at":"2026-05-18T01:10:29.323881Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:10:29.323881Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"eO3BoR4QSuCpRkz6x59PUTtLPpE81VpsxMR19xOzd0w0yvEZNVTs+XOGNT7fh9lmeIPH8xZo4dSmZ8Yh/BwKCg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:10:29.324362Z","signed_message":"canonical_sha256_bytes"},"source_id":"1606.00843","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:42d6ab689d5e942005723302ae57c182a88670609be8331871f68929f1046a36","sha256:2164726e19065e80d14c2453a25ce19b3443822054610ee784223433d8267b47"],"state_sha256":"f3a0c6856f44ff2101f1643f3e45bc97f09e8af7a34ce86a9d36525583eeedd7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rnthSB3Z0Kdk2Wy8kqr1il5U1TFm/BdeeC4rpJa8qRUftE54DC8CMnd+DfBNo0OwgKTcdhLXtrw2/8M6iE9/Dg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T09:43:57.752577Z","bundle_sha256":"bc8ca3df5e9a9909587cb16d6ba48302e14aa504a42e5e9b04cae3d9a51f862a"}}