{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:55IWI3ZKUBEJIJU3ANZB55DBIY","short_pith_number":"pith:55IWI3ZK","canonical_record":{"source":{"id":"1702.04089","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-02-14T06:21:09Z","cross_cats_sorted":["astro-ph.SR","physics.space-ph"],"title_canon_sha256":"d9a44354ea881cbec26b127ecaa39483a462b08c7d8de46ca21b31c1185fc68a","abstract_canon_sha256":"d6f02cc270522c022d1495727f779244fc0d88b6928c11f469b3e8b0d876a6d7"},"schema_version":"1.0"},"canonical_sha256":"ef51646f2aa04894269b03721ef46146134b2fe210e0f2fcdfe2bebc8f3e55d8","source":{"kind":"arxiv","id":"1702.04089","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1702.04089","created_at":"2026-05-18T00:48:41Z"},{"alias_kind":"arxiv_version","alias_value":"1702.04089v2","created_at":"2026-05-18T00:48:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1702.04089","created_at":"2026-05-18T00:48:41Z"},{"alias_kind":"pith_short_12","alias_value":"55IWI3ZKUBEJ","created_at":"2026-05-18T12:31:00Z"},{"alias_kind":"pith_short_16","alias_value":"55IWI3ZKUBEJIJU3","created_at":"2026-05-18T12:31:00Z"},{"alias_kind":"pith_short_8","alias_value":"55IWI3ZK","created_at":"2026-05-18T12:31:00Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:55IWI3ZKUBEJIJU3ANZB55DBIY","target":"record","payload":{"canonical_record":{"source":{"id":"1702.04089","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-02-14T06:21:09Z","cross_cats_sorted":["astro-ph.SR","physics.space-ph"],"title_canon_sha256":"d9a44354ea881cbec26b127ecaa39483a462b08c7d8de46ca21b31c1185fc68a","abstract_canon_sha256":"d6f02cc270522c022d1495727f779244fc0d88b6928c11f469b3e8b0d876a6d7"},"schema_version":"1.0"},"canonical_sha256":"ef51646f2aa04894269b03721ef46146134b2fe210e0f2fcdfe2bebc8f3e55d8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:48:41.796185Z","signature_b64":"kAafdojHPo/U0N6P5vR+N57S9rj+sS48UMqQVF3qSgabAgtO7pcROsfoMcTjPXvPtiVnHTp/D9Dd7eU2+h2wCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ef51646f2aa04894269b03721ef46146134b2fe210e0f2fcdfe2bebc8f3e55d8","last_reissued_at":"2026-05-18T00:48:41.795625Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:48:41.795625Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1702.04089","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:48:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1CF30iek6RMI11G3j7LdB4p9ycFTusPuT/ps4nlQy06M4Vxyr0na6+fwvITt0QOav3jcx5qW/3erTwnGSdOzDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T05:58:07.797419Z"},"content_sha256":"a1bfed93bdb11b915762b76c5082f999d16abcd4c3980ca921f2c0b88b3a1ec1","schema_version":"1.0","event_id":"sha256:a1bfed93bdb11b915762b76c5082f999d16abcd4c3980ca921f2c0b88b3a1ec1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:55IWI3ZKUBEJIJU3ANZB55DBIY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Is Proxima Centauri b habitable? -- A study of atmospheric loss","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR","physics.space-ph"],"primary_cat":"astro-ph.EP","authors_text":"Chuanfei Dong, Manasvi Lingam, Ofer Cohen, Yingjuan Ma","submitted_at":"2017-02-14T06:21:09Z","abstract_excerpt":"We address the important question of whether the newly discovered exoplanet, Proxima Centauri b (PCb), is capable of retaining an atmosphere over long periods of time. This is done by adapting a sophisticated multi-species MHD model originally developed for Venus and Mars, and computing the ion escape losses from PCb. The results suggest that the ion escape rates are about two orders of magnitude higher than the terrestrial planets of our Solar system if PCb is unmagnetized. In contrast, if the planet does have an intrinsic dipole magnetic field, the rates are lowered for certain values of the"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1702.04089","kind":"arxiv","version":2},"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":"2026-05-18T00:48:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pTxVfnVdv+ZDhXQfU1jtRO5EJhqrtWctbTN8/dSCSP8w9emvVHKIhBWbgmu0TTsDW4YdBLk+V6tsMVyCVN9JCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T05:58:07.797779Z"},"content_sha256":"12a147eeac07725598f841aa6b774883cf1dc18ab06d8466b070eea5392a04f5","schema_version":"1.0","event_id":"sha256:12a147eeac07725598f841aa6b774883cf1dc18ab06d8466b070eea5392a04f5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/55IWI3ZKUBEJIJU3ANZB55DBIY/bundle.json","state_url":"https://pith.science/pith/55IWI3ZKUBEJIJU3ANZB55DBIY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/55IWI3ZKUBEJIJU3ANZB55DBIY/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":"2026-05-31T05:58:07Z","links":{"resolver":"https://pith.science/pith/55IWI3ZKUBEJIJU3ANZB55DBIY","bundle":"https://pith.science/pith/55IWI3ZKUBEJIJU3ANZB55DBIY/bundle.json","state":"https://pith.science/pith/55IWI3ZKUBEJIJU3ANZB55DBIY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/55IWI3ZKUBEJIJU3ANZB55DBIY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:55IWI3ZKUBEJIJU3ANZB55DBIY","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":"d6f02cc270522c022d1495727f779244fc0d88b6928c11f469b3e8b0d876a6d7","cross_cats_sorted":["astro-ph.SR","physics.space-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-02-14T06:21:09Z","title_canon_sha256":"d9a44354ea881cbec26b127ecaa39483a462b08c7d8de46ca21b31c1185fc68a"},"schema_version":"1.0","source":{"id":"1702.04089","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1702.04089","created_at":"2026-05-18T00:48:41Z"},{"alias_kind":"arxiv_version","alias_value":"1702.04089v2","created_at":"2026-05-18T00:48:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1702.04089","created_at":"2026-05-18T00:48:41Z"},{"alias_kind":"pith_short_12","alias_value":"55IWI3ZKUBEJ","created_at":"2026-05-18T12:31:00Z"},{"alias_kind":"pith_short_16","alias_value":"55IWI3ZKUBEJIJU3","created_at":"2026-05-18T12:31:00Z"},{"alias_kind":"pith_short_8","alias_value":"55IWI3ZK","created_at":"2026-05-18T12:31:00Z"}],"graph_snapshots":[{"event_id":"sha256:12a147eeac07725598f841aa6b774883cf1dc18ab06d8466b070eea5392a04f5","target":"graph","created_at":"2026-05-18T00:48:41Z","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 address the important question of whether the newly discovered exoplanet, Proxima Centauri b (PCb), is capable of retaining an atmosphere over long periods of time. This is done by adapting a sophisticated multi-species MHD model originally developed for Venus and Mars, and computing the ion escape losses from PCb. The results suggest that the ion escape rates are about two orders of magnitude higher than the terrestrial planets of our Solar system if PCb is unmagnetized. In contrast, if the planet does have an intrinsic dipole magnetic field, the rates are lowered for certain values of the","authors_text":"Chuanfei Dong, Manasvi Lingam, Ofer Cohen, Yingjuan Ma","cross_cats":["astro-ph.SR","physics.space-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-02-14T06:21:09Z","title":"Is Proxima Centauri b habitable? -- A study of atmospheric loss"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1702.04089","kind":"arxiv","version":2},"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:a1bfed93bdb11b915762b76c5082f999d16abcd4c3980ca921f2c0b88b3a1ec1","target":"record","created_at":"2026-05-18T00:48:41Z","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":"d6f02cc270522c022d1495727f779244fc0d88b6928c11f469b3e8b0d876a6d7","cross_cats_sorted":["astro-ph.SR","physics.space-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-02-14T06:21:09Z","title_canon_sha256":"d9a44354ea881cbec26b127ecaa39483a462b08c7d8de46ca21b31c1185fc68a"},"schema_version":"1.0","source":{"id":"1702.04089","kind":"arxiv","version":2}},"canonical_sha256":"ef51646f2aa04894269b03721ef46146134b2fe210e0f2fcdfe2bebc8f3e55d8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ef51646f2aa04894269b03721ef46146134b2fe210e0f2fcdfe2bebc8f3e55d8","first_computed_at":"2026-05-18T00:48:41.795625Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:48:41.795625Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kAafdojHPo/U0N6P5vR+N57S9rj+sS48UMqQVF3qSgabAgtO7pcROsfoMcTjPXvPtiVnHTp/D9Dd7eU2+h2wCA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:48:41.796185Z","signed_message":"canonical_sha256_bytes"},"source_id":"1702.04089","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a1bfed93bdb11b915762b76c5082f999d16abcd4c3980ca921f2c0b88b3a1ec1","sha256:12a147eeac07725598f841aa6b774883cf1dc18ab06d8466b070eea5392a04f5"],"state_sha256":"29d7b1a750b44830c54f0493f1e3973517f51f4acc2a1e601a3daef15a1bb18f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ygLyhJBuAa7g15SSwLVk7a5txL02ZgKLmr9Ttq394GqedAw+a3Ld6wf4KCM93WZOd/UVcaDnWUxDE1aWnKfRDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T05:58:07.799730Z","bundle_sha256":"32ff3153682e915df6e0cbf334b60f737533f213672b21d2bfacdf5f2857b632"}}