{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:MNZDFWRUZ5E52GNQ2ZCKVSRNSH","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":"4b40f1292fc8c2d70864d78c0c90fd46fd23b2d822647189a192e2a80fa26e15","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-09-07T20:00:05Z","title_canon_sha256":"310cd5dc1f83d6f873a40a49c99540eaed7313ba9f69405dd2b0a09989485987"},"schema_version":"1.0","source":{"id":"1609.02156","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1609.02156","created_at":"2026-05-18T00:52:14Z"},{"alias_kind":"arxiv_version","alias_value":"1609.02156v3","created_at":"2026-05-18T00:52:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1609.02156","created_at":"2026-05-18T00:52:14Z"},{"alias_kind":"pith_short_12","alias_value":"MNZDFWRUZ5E5","created_at":"2026-05-18T12:30:32Z"},{"alias_kind":"pith_short_16","alias_value":"MNZDFWRUZ5E52GNQ","created_at":"2026-05-18T12:30:32Z"},{"alias_kind":"pith_short_8","alias_value":"MNZDFWRU","created_at":"2026-05-18T12:30:32Z"}],"graph_snapshots":[{"event_id":"sha256:b043437655602427dce77070676e18262641c766786276e5203eaff4d5256649","target":"graph","created_at":"2026-05-18T00:52:14Z","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"},"paper":{"abstract_excerpt":"From a sample of spectra of 439 white dwarfs (WDs) from the ESO-VLT Supernova-Ia Progenitor surveY (SPY), we measure the maximal changes in radial-velocity (DRVmax) between epochs (generally two epochs, separated by up to 470d), and model the observed DRVmax statistics via Monte-Carlo simulations, to constrain the population characteristics of double WDs (DWDs). The DWD fraction among WDs is fbin=0.100+/-0.020 (1-sigma, random) +0.02 (systematic), in the separation range ~<4AU within which the data are sensitive to binarity. Assuming the distribution of binary separation, a, is a power-law, dN","authors_text":"Dan Maoz, Na'ama Hallakoun","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-09-07T20:00:05Z","title":"The binary fraction, separation distribution, and merger rate of white dwarfs from SPY"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1609.02156","kind":"arxiv","version":3},"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":"sha256:11dddffd5c4271e45df1444ace173895947acd224cdf44dc8c3222af429e60c0","target":"record","created_at":"2026-05-18T00:52:14Z","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":"4b40f1292fc8c2d70864d78c0c90fd46fd23b2d822647189a192e2a80fa26e15","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-09-07T20:00:05Z","title_canon_sha256":"310cd5dc1f83d6f873a40a49c99540eaed7313ba9f69405dd2b0a09989485987"},"schema_version":"1.0","source":{"id":"1609.02156","kind":"arxiv","version":3}},"canonical_sha256":"637232da34cf49dd19b0d644aaca2d91c333b74b3010af1d44e82c5f08307153","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"637232da34cf49dd19b0d644aaca2d91c333b74b3010af1d44e82c5f08307153","first_computed_at":"2026-05-18T00:52:14.847190Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:52:14.847190Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8DdDg6XHiQiHRV7PtCjAezsm4W9DSvHV+2pdvDGj5aMuuqn8yQsrpTw3bZvyaJGZKaIeW9o4X77MRbd0UhKoBw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:52:14.847696Z","signed_message":"canonical_sha256_bytes"},"source_id":"1609.02156","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:11dddffd5c4271e45df1444ace173895947acd224cdf44dc8c3222af429e60c0","sha256:b043437655602427dce77070676e18262641c766786276e5203eaff4d5256649"],"state_sha256":"dbe1eedcc55efabf59d6ed1d26ec79b7aded3e76f6ae5cec65017defdfd6ef36"}