{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:DLTMJHVHPBNQVGD3UKEG5UZQGZ","short_pith_number":"pith:DLTMJHVH","canonical_record":{"source":{"id":"1903.11098","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-03-26T18:11:36Z","cross_cats_sorted":["astro-ph.GA","astro-ph.IM"],"title_canon_sha256":"a6a018760d678cf4470d14225ee6639bc65fa5cca271ad1025c70fefa9be0038","abstract_canon_sha256":"fb7609719be8c31f9bd3488d314ded23db1db72b7dc3740564c6cd4b2b82d523"},"schema_version":"1.0"},"canonical_sha256":"1ae6c49ea7785b0a987ba2886ed3303679b52b3c3c47e0fee0c22e46da49471a","source":{"kind":"arxiv","id":"1903.11098","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1903.11098","created_at":"2026-05-17T23:45:27Z"},{"alias_kind":"arxiv_version","alias_value":"1903.11098v1","created_at":"2026-05-17T23:45:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1903.11098","created_at":"2026-05-17T23:45:27Z"},{"alias_kind":"pith_short_12","alias_value":"DLTMJHVHPBNQ","created_at":"2026-05-18T12:33:15Z"},{"alias_kind":"pith_short_16","alias_value":"DLTMJHVHPBNQVGD3","created_at":"2026-05-18T12:33:15Z"},{"alias_kind":"pith_short_8","alias_value":"DLTMJHVH","created_at":"2026-05-18T12:33:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:DLTMJHVHPBNQVGD3UKEG5UZQGZ","target":"record","payload":{"canonical_record":{"source":{"id":"1903.11098","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-03-26T18:11:36Z","cross_cats_sorted":["astro-ph.GA","astro-ph.IM"],"title_canon_sha256":"a6a018760d678cf4470d14225ee6639bc65fa5cca271ad1025c70fefa9be0038","abstract_canon_sha256":"fb7609719be8c31f9bd3488d314ded23db1db72b7dc3740564c6cd4b2b82d523"},"schema_version":"1.0"},"canonical_sha256":"1ae6c49ea7785b0a987ba2886ed3303679b52b3c3c47e0fee0c22e46da49471a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:45:27.100567Z","signature_b64":"+wR3eXxlYtSYVcxHx1FBUl5ghKntnRoadcFttoB94SGfwAotR00yKnyY+zwOpO0eUifVL1xOSoNTvjVU291XCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1ae6c49ea7785b0a987ba2886ed3303679b52b3c3c47e0fee0c22e46da49471a","last_reissued_at":"2026-05-17T23:45:27.100157Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:45:27.100157Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1903.11098","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":"2026-05-17T23:45:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3t3NynXVUoZmhHqc4uFbD+DkTT196VGQGcQyb3EhI6/6f9U2OlFTSRW4HzqutIw1PBkwne3quDkWs1fXh5M8BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T22:52:23.728010Z"},"content_sha256":"ebc58251349d5b52dfa0d900e1d3461050ae90ef90fd5ae9381b5f9e93c4d4cd","schema_version":"1.0","event_id":"sha256:ebc58251349d5b52dfa0d900e1d3461050ae90ef90fd5ae9381b5f9e93c4d4cd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:DLTMJHVHPBNQVGD3UKEG5UZQGZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Simulating stellar winds in AMUSE","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA","astro-ph.IM"],"primary_cat":"astro-ph.SR","authors_text":"Edwin van der Helm, Martha I. Saladino, Onno Pols, Simon Portegies Zwart","submitted_at":"2019-03-26T18:11:36Z","abstract_excerpt":"We present stellar_wind.py, a module that provides multiple methods of simulating stellar winds using smoothed particle hydrodynamics codes (SPH) within the astrophysical multipurpose software environment (AMUSE) framework. With the simple wind mode, we create SPH wind particles in a spherically symmetric shell. We inject the wind particles with a velocity equal to their terminal velocity. The accelerating wind mode is similar, but with this method particles can be injected with a lower initial velocity than the terminal velocity and they are accelerated away from the star according to an acce"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1903.11098","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":"2026-05-17T23:45:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QLClAn7EltVbaharqeHcIL9+yie1b0QPPfaqvcQ5JUrL8EeziHuBwbi1YQf4BhIGSrfgdkygQI4yoNBWqdv5Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T22:52:23.728669Z"},"content_sha256":"fc5bc86e9c72daa8df83a806a4d373058846f4d1cc4d03c675ff63d4a530413a","schema_version":"1.0","event_id":"sha256:fc5bc86e9c72daa8df83a806a4d373058846f4d1cc4d03c675ff63d4a530413a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DLTMJHVHPBNQVGD3UKEG5UZQGZ/bundle.json","state_url":"https://pith.science/pith/DLTMJHVHPBNQVGD3UKEG5UZQGZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DLTMJHVHPBNQVGD3UKEG5UZQGZ/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":"2026-05-25T22:52:23Z","links":{"resolver":"https://pith.science/pith/DLTMJHVHPBNQVGD3UKEG5UZQGZ","bundle":"https://pith.science/pith/DLTMJHVHPBNQVGD3UKEG5UZQGZ/bundle.json","state":"https://pith.science/pith/DLTMJHVHPBNQVGD3UKEG5UZQGZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DLTMJHVHPBNQVGD3UKEG5UZQGZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:DLTMJHVHPBNQVGD3UKEG5UZQGZ","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":"fb7609719be8c31f9bd3488d314ded23db1db72b7dc3740564c6cd4b2b82d523","cross_cats_sorted":["astro-ph.GA","astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-03-26T18:11:36Z","title_canon_sha256":"a6a018760d678cf4470d14225ee6639bc65fa5cca271ad1025c70fefa9be0038"},"schema_version":"1.0","source":{"id":"1903.11098","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1903.11098","created_at":"2026-05-17T23:45:27Z"},{"alias_kind":"arxiv_version","alias_value":"1903.11098v1","created_at":"2026-05-17T23:45:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1903.11098","created_at":"2026-05-17T23:45:27Z"},{"alias_kind":"pith_short_12","alias_value":"DLTMJHVHPBNQ","created_at":"2026-05-18T12:33:15Z"},{"alias_kind":"pith_short_16","alias_value":"DLTMJHVHPBNQVGD3","created_at":"2026-05-18T12:33:15Z"},{"alias_kind":"pith_short_8","alias_value":"DLTMJHVH","created_at":"2026-05-18T12:33:15Z"}],"graph_snapshots":[{"event_id":"sha256:fc5bc86e9c72daa8df83a806a4d373058846f4d1cc4d03c675ff63d4a530413a","target":"graph","created_at":"2026-05-17T23:45:27Z","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 stellar_wind.py, a module that provides multiple methods of simulating stellar winds using smoothed particle hydrodynamics codes (SPH) within the astrophysical multipurpose software environment (AMUSE) framework. With the simple wind mode, we create SPH wind particles in a spherically symmetric shell. We inject the wind particles with a velocity equal to their terminal velocity. The accelerating wind mode is similar, but with this method particles can be injected with a lower initial velocity than the terminal velocity and they are accelerated away from the star according to an acce","authors_text":"Edwin van der Helm, Martha I. Saladino, Onno Pols, Simon Portegies Zwart","cross_cats":["astro-ph.GA","astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-03-26T18:11:36Z","title":"Simulating stellar winds in AMUSE"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1903.11098","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:ebc58251349d5b52dfa0d900e1d3461050ae90ef90fd5ae9381b5f9e93c4d4cd","target":"record","created_at":"2026-05-17T23:45:27Z","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":"fb7609719be8c31f9bd3488d314ded23db1db72b7dc3740564c6cd4b2b82d523","cross_cats_sorted":["astro-ph.GA","astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-03-26T18:11:36Z","title_canon_sha256":"a6a018760d678cf4470d14225ee6639bc65fa5cca271ad1025c70fefa9be0038"},"schema_version":"1.0","source":{"id":"1903.11098","kind":"arxiv","version":1}},"canonical_sha256":"1ae6c49ea7785b0a987ba2886ed3303679b52b3c3c47e0fee0c22e46da49471a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1ae6c49ea7785b0a987ba2886ed3303679b52b3c3c47e0fee0c22e46da49471a","first_computed_at":"2026-05-17T23:45:27.100157Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:45:27.100157Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+wR3eXxlYtSYVcxHx1FBUl5ghKntnRoadcFttoB94SGfwAotR00yKnyY+zwOpO0eUifVL1xOSoNTvjVU291XCg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:45:27.100567Z","signed_message":"canonical_sha256_bytes"},"source_id":"1903.11098","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ebc58251349d5b52dfa0d900e1d3461050ae90ef90fd5ae9381b5f9e93c4d4cd","sha256:fc5bc86e9c72daa8df83a806a4d373058846f4d1cc4d03c675ff63d4a530413a"],"state_sha256":"1897dbc8917f39b0c41164d6d95f38d7aae30cd2e853048bc92385ab25aca917"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DIExicQ6Nz2ynkUgn9/pJPJd0YIUhraUv1FX3lqP/0g4kHZgsmaKLFzHddFH1t+CtJyBo9LOuCnaO2H+EhwMDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T22:52:23.732270Z","bundle_sha256":"4caba368ca0dac88e87674c78131b6c13f721e5b3099fedd6afb620e506c79d4"}}