{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:SXENU55KP2KYICIHWEEJQVLEFF","short_pith_number":"pith:SXENU55K","canonical_record":{"source":{"id":"1602.07939","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-02-25T14:12:15Z","cross_cats_sorted":["astro-ph.EP"],"title_canon_sha256":"3bc40ed767592bd753da08f7def7ed31644c798b3278d9a4df88f49b17a98897","abstract_canon_sha256":"3cad1c4da4405e6a859ff9345dc07d65336eb13f1c766ae877fa7a98601cb6a8"},"schema_version":"1.0"},"canonical_sha256":"95c8da77aa7e95840907b108985564294d183d3ba31317ff4886372d53dbf143","source":{"kind":"arxiv","id":"1602.07939","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1602.07939","created_at":"2026-05-18T01:13:55Z"},{"alias_kind":"arxiv_version","alias_value":"1602.07939v2","created_at":"2026-05-18T01:13:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1602.07939","created_at":"2026-05-18T01:13:55Z"},{"alias_kind":"pith_short_12","alias_value":"SXENU55KP2KY","created_at":"2026-05-18T12:30:44Z"},{"alias_kind":"pith_short_16","alias_value":"SXENU55KP2KYICIH","created_at":"2026-05-18T12:30:44Z"},{"alias_kind":"pith_short_8","alias_value":"SXENU55K","created_at":"2026-05-18T12:30:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:SXENU55KP2KYICIHWEEJQVLEFF","target":"record","payload":{"canonical_record":{"source":{"id":"1602.07939","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-02-25T14:12:15Z","cross_cats_sorted":["astro-ph.EP"],"title_canon_sha256":"3bc40ed767592bd753da08f7def7ed31644c798b3278d9a4df88f49b17a98897","abstract_canon_sha256":"3cad1c4da4405e6a859ff9345dc07d65336eb13f1c766ae877fa7a98601cb6a8"},"schema_version":"1.0"},"canonical_sha256":"95c8da77aa7e95840907b108985564294d183d3ba31317ff4886372d53dbf143","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:13:55.220848Z","signature_b64":"VW1wHycOcH15U/fHjnu9GHEg9o/SlqOjpGxUujof5wKDYlKCCc8ODBZchXEQ7ew2q/Y7Sv4GYMMRmMfG6rjMAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"95c8da77aa7e95840907b108985564294d183d3ba31317ff4886372d53dbf143","last_reissued_at":"2026-05-18T01:13:55.220254Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:13:55.220254Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1602.07939","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":"2026-05-18T01:13:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UqrybhpOsWmEZkHulIOhUy6XeXBNpm5xTq2k/MswUiTTsN7/Mef5acpfPJ5rufB/aU+Ef56vZGb7OR7InBWOAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T15:30:34.275873Z"},"content_sha256":"702b15cb442c55e538c1a44a22765f362ee869b3c327a07818405e5340aa8a94","schema_version":"1.0","event_id":"sha256:702b15cb442c55e538c1a44a22765f362ee869b3c327a07818405e5340aa8a94"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:SXENU55KP2KYICIHWEEJQVLEFF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"State of the Field: Extreme Precision Radial Velocities","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.EP"],"primary_cat":"astro-ph.IM","authors_text":"Abhijit Chakraborty, Alessandro Sozzetti, Andreas Quirrenbach, Andrew Szentgyorgyi, Andrew W. Howard, Ansgar Reiners, Artie P. Hatzes, B. Scott Gaudi, Christophe Lovis, Colby A. Jurgenson, Damien Segransan, Daniel Foreman-Mackey, David F. Phillips, David Sawyer, David W. Hogg, David W. Latham, Debra Fischer, Enrique Herrero, Eric B. Ford, Francesco Pepe, Francois Bouchy, Frank Grundahl, Gabor Furesz, Greg Laughlin, Guillaume Hebrard, Guillem Anglada-Escude, Jacob L. Bean, Jason D. Eastman, Jason T. Wright, Jeff A. Valenti, John A. Johnson, Justin R. Crepp, Lars A. Buchhave, Lisa Prato, Mario Perez, Michael Endl, Nuno C. Santos, Pamela Arriagada, Paul Fournier, Paul Jorden, Paul Robertson, Pedro Figueira, Peter P. Plavchan, Philip C. Gregory, Rebekah I. Dawson, Robert A. Wittenmyer, Roman V. Baluev, Scott A. Diddams, Sharon X. Wang, Stephane Udry, Suvrath Mahadevan, Thomas J. Loredo, Thorsten Carroll, Tilo Steinmetz, Tyler M. McCracken, Xavier Dumusque","submitted_at":"2016-02-25T14:12:15Z","abstract_excerpt":"The Second Workshop on Extreme Precision Radial Velocities defined circa 2015 the state of the art Doppler precision and identified the critical path challenges for reaching 10 cm/s measurement precision. The presentations and discussion of key issues for instrumentation and data analysis and the workshop recommendations for achieving this precision are summarized here.\n  Beginning with the HARPS spectrograph, technological advances for precision radial velocity measurements have focused on building extremely stable instruments. To reach still higher precision, future spectrometers will need t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1602.07939","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":"2026-05-18T01:13:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1n0z6uLXsyam18r4Y7peMuriVPOq44nnJk9oABdVYkIWCxTbGjBlBMHDYklGuo+9zlFzOBXCFOD+CW3VtIHrCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T15:30:34.276376Z"},"content_sha256":"fb026740af1860f2280a8496c49c4ae3e57982c17fb069d3ff89153594171996","schema_version":"1.0","event_id":"sha256:fb026740af1860f2280a8496c49c4ae3e57982c17fb069d3ff89153594171996"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SXENU55KP2KYICIHWEEJQVLEFF/bundle.json","state_url":"https://pith.science/pith/SXENU55KP2KYICIHWEEJQVLEFF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SXENU55KP2KYICIHWEEJQVLEFF/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":"2026-05-21T15:30:34Z","links":{"resolver":"https://pith.science/pith/SXENU55KP2KYICIHWEEJQVLEFF","bundle":"https://pith.science/pith/SXENU55KP2KYICIHWEEJQVLEFF/bundle.json","state":"https://pith.science/pith/SXENU55KP2KYICIHWEEJQVLEFF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SXENU55KP2KYICIHWEEJQVLEFF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:SXENU55KP2KYICIHWEEJQVLEFF","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":"3cad1c4da4405e6a859ff9345dc07d65336eb13f1c766ae877fa7a98601cb6a8","cross_cats_sorted":["astro-ph.EP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-02-25T14:12:15Z","title_canon_sha256":"3bc40ed767592bd753da08f7def7ed31644c798b3278d9a4df88f49b17a98897"},"schema_version":"1.0","source":{"id":"1602.07939","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1602.07939","created_at":"2026-05-18T01:13:55Z"},{"alias_kind":"arxiv_version","alias_value":"1602.07939v2","created_at":"2026-05-18T01:13:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1602.07939","created_at":"2026-05-18T01:13:55Z"},{"alias_kind":"pith_short_12","alias_value":"SXENU55KP2KY","created_at":"2026-05-18T12:30:44Z"},{"alias_kind":"pith_short_16","alias_value":"SXENU55KP2KYICIH","created_at":"2026-05-18T12:30:44Z"},{"alias_kind":"pith_short_8","alias_value":"SXENU55K","created_at":"2026-05-18T12:30:44Z"}],"graph_snapshots":[{"event_id":"sha256:fb026740af1860f2280a8496c49c4ae3e57982c17fb069d3ff89153594171996","target":"graph","created_at":"2026-05-18T01:13:55Z","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":"The Second Workshop on Extreme Precision Radial Velocities defined circa 2015 the state of the art Doppler precision and identified the critical path challenges for reaching 10 cm/s measurement precision. The presentations and discussion of key issues for instrumentation and data analysis and the workshop recommendations for achieving this precision are summarized here.\n  Beginning with the HARPS spectrograph, technological advances for precision radial velocity measurements have focused on building extremely stable instruments. To reach still higher precision, future spectrometers will need t","authors_text":"Abhijit Chakraborty, Alessandro Sozzetti, Andreas Quirrenbach, Andrew Szentgyorgyi, Andrew W. Howard, Ansgar Reiners, Artie P. Hatzes, B. Scott Gaudi, Christophe Lovis, Colby A. Jurgenson, Damien Segransan, Daniel Foreman-Mackey, David F. Phillips, David Sawyer, David W. Hogg, David W. Latham, Debra Fischer, Enrique Herrero, Eric B. Ford, Francesco Pepe, Francois Bouchy, Frank Grundahl, Gabor Furesz, Greg Laughlin, Guillaume Hebrard, Guillem Anglada-Escude, Jacob L. Bean, Jason D. Eastman, Jason T. Wright, Jeff A. Valenti, John A. Johnson, Justin R. Crepp, Lars A. Buchhave, Lisa Prato, Mario Perez, Michael Endl, Nuno C. Santos, Pamela Arriagada, Paul Fournier, Paul Jorden, Paul Robertson, Pedro Figueira, Peter P. Plavchan, Philip C. Gregory, Rebekah I. Dawson, Robert A. Wittenmyer, Roman V. Baluev, Scott A. Diddams, Sharon X. Wang, Stephane Udry, Suvrath Mahadevan, Thomas J. Loredo, Thorsten Carroll, Tilo Steinmetz, Tyler M. McCracken, Xavier Dumusque","cross_cats":["astro-ph.EP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-02-25T14:12:15Z","title":"State of the Field: Extreme Precision Radial Velocities"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1602.07939","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":"sha256:702b15cb442c55e538c1a44a22765f362ee869b3c327a07818405e5340aa8a94","target":"record","created_at":"2026-05-18T01:13:55Z","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":"3cad1c4da4405e6a859ff9345dc07d65336eb13f1c766ae877fa7a98601cb6a8","cross_cats_sorted":["astro-ph.EP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-02-25T14:12:15Z","title_canon_sha256":"3bc40ed767592bd753da08f7def7ed31644c798b3278d9a4df88f49b17a98897"},"schema_version":"1.0","source":{"id":"1602.07939","kind":"arxiv","version":2}},"canonical_sha256":"95c8da77aa7e95840907b108985564294d183d3ba31317ff4886372d53dbf143","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"95c8da77aa7e95840907b108985564294d183d3ba31317ff4886372d53dbf143","first_computed_at":"2026-05-18T01:13:55.220254Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:13:55.220254Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VW1wHycOcH15U/fHjnu9GHEg9o/SlqOjpGxUujof5wKDYlKCCc8ODBZchXEQ7ew2q/Y7Sv4GYMMRmMfG6rjMAw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:13:55.220848Z","signed_message":"canonical_sha256_bytes"},"source_id":"1602.07939","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:702b15cb442c55e538c1a44a22765f362ee869b3c327a07818405e5340aa8a94","sha256:fb026740af1860f2280a8496c49c4ae3e57982c17fb069d3ff89153594171996"],"state_sha256":"4573a00822354107f08d484dfa5f93c3a3dcc9dc32e1351a7afe1022ee3843e4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"trCYP7uskJX/IgyRQXzTb/xAgJ4ZawIbRpnApeEqfioeiRDi1D895puCwvLHveVG8X6ilaPALmU6RkqqyTAvAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-21T15:30:34.279543Z","bundle_sha256":"dc28e7fdf8c799b25df86d4adc8932595f8a38eccaada394baa6427aafb587e7"}}