{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2007:Y3HNYUKHZP5YACZCJMYJWG66NV","short_pith_number":"pith:Y3HNYUKH","canonical_record":{"source":{"id":"0709.2376","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2007-09-15T18:54:46Z","cross_cats_sorted":[],"title_canon_sha256":"995125307fa80b9c0ef452b041ec68044fc81baa41baba463e2297d1ca7cd812","abstract_canon_sha256":"228b4c754c6a55b1c50f7d92dea7dac2b7e54d65da235b2e9bb7ec078e3eabff"},"schema_version":"1.0"},"canonical_sha256":"c6cedc5147cbfb800b224b309b1bde6d78349b5d1ea3229d41309602e305c768","source":{"kind":"arxiv","id":"0709.2376","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0709.2376","created_at":"2026-05-18T02:35:30Z"},{"alias_kind":"arxiv_version","alias_value":"0709.2376v2","created_at":"2026-05-18T02:35:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0709.2376","created_at":"2026-05-18T02:35:30Z"},{"alias_kind":"pith_short_12","alias_value":"Y3HNYUKHZP5Y","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_16","alias_value":"Y3HNYUKHZP5YACZC","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_8","alias_value":"Y3HNYUKH","created_at":"2026-05-18T12:25:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2007:Y3HNYUKHZP5YACZCJMYJWG66NV","target":"record","payload":{"canonical_record":{"source":{"id":"0709.2376","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2007-09-15T18:54:46Z","cross_cats_sorted":[],"title_canon_sha256":"995125307fa80b9c0ef452b041ec68044fc81baa41baba463e2297d1ca7cd812","abstract_canon_sha256":"228b4c754c6a55b1c50f7d92dea7dac2b7e54d65da235b2e9bb7ec078e3eabff"},"schema_version":"1.0"},"canonical_sha256":"c6cedc5147cbfb800b224b309b1bde6d78349b5d1ea3229d41309602e305c768","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:35:30.393362Z","signature_b64":"g5zO5oI4XXsBtAozbMHATqNI5RgRN8PQlmjeIrglFb4Yg46cBIii9ZBfEIY182XQQUcO4Od23GobmIUdmhTTBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c6cedc5147cbfb800b224b309b1bde6d78349b5d1ea3229d41309602e305c768","last_reissued_at":"2026-05-18T02:35:30.392767Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:35:30.392767Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0709.2376","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":"2026-05-18T02:35:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"R3PnCa7zHfLErGMUJan/ZMf3eRhGAlB0pmWvOqtttt5eHvwK3IO0FmDCW007Ab7rzGq8s+38YPXBkxu9mUuOBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T16:34:13.435410Z"},"content_sha256":"9c31c9f31e32024f89031f0b539cc464ba67115c3c880a4912406b95c3cdc415","schema_version":"1.0","event_id":"sha256:9c31c9f31e32024f89031f0b539cc464ba67115c3c880a4912406b95c3cdc415"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2007:Y3HNYUKHZP5YACZCJMYJWG66NV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"LBT Discovery of a Yellow Supergiant Eclipsing Binary in the Dwarf Galaxy Holmberg IX","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. Baruffolo, C. De Santis, C. S. Kochanek, D. J. Thompson, D. R. Weisz, E. Giallongo, J. Bechtold, J. L. Prieto, J. M. Hill, K. Z. Stanek, P. M. Garnavich, R. M. Wagner, R. Ragazzoni, R. Speziali, R. W. Pogge, S. Gallozzi, V. Burwitz","submitted_at":"2007-09-15T18:54:46Z","abstract_excerpt":"In a variability survey of M81 using the Large Binocular Telescope we have discovered a peculiar eclipsing binary (MV ~ -7.1) in the field of the dwarf galaxy Holmberg IX. It has a period of 272 days and the light curve is well-fit by an overcontact model in which both stars are overflowing their Roche lobes. It is composed by two yellow supergiants (V-I ~ 1 mag, T_eff = 4800 K), rather than the far more common red or blue supergiants. Such systems must be rare. While we failed to find any similar systems in the literature, we did, however note a second example. The SMC F0 supergiant R47 is a "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0709.2376","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":"2026-05-18T02:35:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UV2RqYutxV4gMvOsY/aov7sjyYVXKtv/gxhjEqo6JADeB1sc7ixJVWy/LANYWU9JTjCxTkLqub2LqOQ4Dzp6Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T16:34:13.435766Z"},"content_sha256":"ff757831e234eba97b7f118f5ebe5c01958afd85206b3b7149fbab4142c91551","schema_version":"1.0","event_id":"sha256:ff757831e234eba97b7f118f5ebe5c01958afd85206b3b7149fbab4142c91551"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Y3HNYUKHZP5YACZCJMYJWG66NV/bundle.json","state_url":"https://pith.science/pith/Y3HNYUKHZP5YACZCJMYJWG66NV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Y3HNYUKHZP5YACZCJMYJWG66NV/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":"2026-06-01T16:34:13Z","links":{"resolver":"https://pith.science/pith/Y3HNYUKHZP5YACZCJMYJWG66NV","bundle":"https://pith.science/pith/Y3HNYUKHZP5YACZCJMYJWG66NV/bundle.json","state":"https://pith.science/pith/Y3HNYUKHZP5YACZCJMYJWG66NV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Y3HNYUKHZP5YACZCJMYJWG66NV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2007:Y3HNYUKHZP5YACZCJMYJWG66NV","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":"228b4c754c6a55b1c50f7d92dea7dac2b7e54d65da235b2e9bb7ec078e3eabff","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2007-09-15T18:54:46Z","title_canon_sha256":"995125307fa80b9c0ef452b041ec68044fc81baa41baba463e2297d1ca7cd812"},"schema_version":"1.0","source":{"id":"0709.2376","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0709.2376","created_at":"2026-05-18T02:35:30Z"},{"alias_kind":"arxiv_version","alias_value":"0709.2376v2","created_at":"2026-05-18T02:35:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0709.2376","created_at":"2026-05-18T02:35:30Z"},{"alias_kind":"pith_short_12","alias_value":"Y3HNYUKHZP5Y","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_16","alias_value":"Y3HNYUKHZP5YACZC","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_8","alias_value":"Y3HNYUKH","created_at":"2026-05-18T12:25:56Z"}],"graph_snapshots":[{"event_id":"sha256:ff757831e234eba97b7f118f5ebe5c01958afd85206b3b7149fbab4142c91551","target":"graph","created_at":"2026-05-18T02:35:30Z","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":"In a variability survey of M81 using the Large Binocular Telescope we have discovered a peculiar eclipsing binary (MV ~ -7.1) in the field of the dwarf galaxy Holmberg IX. It has a period of 272 days and the light curve is well-fit by an overcontact model in which both stars are overflowing their Roche lobes. It is composed by two yellow supergiants (V-I ~ 1 mag, T_eff = 4800 K), rather than the far more common red or blue supergiants. Such systems must be rare. While we failed to find any similar systems in the literature, we did, however note a second example. The SMC F0 supergiant R47 is a ","authors_text":"A. Baruffolo, C. De Santis, C. S. Kochanek, D. J. Thompson, D. R. Weisz, E. Giallongo, J. Bechtold, J. L. Prieto, J. M. Hill, K. Z. Stanek, P. M. Garnavich, R. M. Wagner, R. Ragazzoni, R. Speziali, R. W. Pogge, S. Gallozzi, V. Burwitz","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2007-09-15T18:54:46Z","title":"LBT Discovery of a Yellow Supergiant Eclipsing Binary in the Dwarf Galaxy Holmberg IX"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0709.2376","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":"sha256:9c31c9f31e32024f89031f0b539cc464ba67115c3c880a4912406b95c3cdc415","target":"record","created_at":"2026-05-18T02:35:30Z","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":"228b4c754c6a55b1c50f7d92dea7dac2b7e54d65da235b2e9bb7ec078e3eabff","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2007-09-15T18:54:46Z","title_canon_sha256":"995125307fa80b9c0ef452b041ec68044fc81baa41baba463e2297d1ca7cd812"},"schema_version":"1.0","source":{"id":"0709.2376","kind":"arxiv","version":2}},"canonical_sha256":"c6cedc5147cbfb800b224b309b1bde6d78349b5d1ea3229d41309602e305c768","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c6cedc5147cbfb800b224b309b1bde6d78349b5d1ea3229d41309602e305c768","first_computed_at":"2026-05-18T02:35:30.392767Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:35:30.392767Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"g5zO5oI4XXsBtAozbMHATqNI5RgRN8PQlmjeIrglFb4Yg46cBIii9ZBfEIY182XQQUcO4Od23GobmIUdmhTTBw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:35:30.393362Z","signed_message":"canonical_sha256_bytes"},"source_id":"0709.2376","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9c31c9f31e32024f89031f0b539cc464ba67115c3c880a4912406b95c3cdc415","sha256:ff757831e234eba97b7f118f5ebe5c01958afd85206b3b7149fbab4142c91551"],"state_sha256":"c17ee0611d70efc2fcafa7f242de4521a3d59952c67a4920802bb4bedcaea3fc"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FTsW6ZxGquLRhfRaLr+rtq2DTQSXA8X/4BbOpi6qI314h3UkOXDgTAQxLCDA+wVAgrqlnVCBqcfrY7+W2dpSBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T16:34:13.437620Z","bundle_sha256":"dbfd8b45294dbaf4a7aeb734e77b53c29fd4690e98f7eb0929098dd98cf6b396"}}