{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:M2QSNYHE4AB345MDKZGM6OGKEB","short_pith_number":"pith:M2QSNYHE","schema_version":"1.0","canonical_sha256":"66a126e0e4e003be7583564ccf38ca20565a3d4b1e5ab5875f26a6c9d3378612","source":{"kind":"arxiv","id":"1805.02801","version":1},"attestation_state":"computed","paper":{"title":"A Methane Extension to the Classical Habitable Zone","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Lisa Kaltenegger, Ramses M. Ramirez","submitted_at":"2018-05-08T01:58:08Z","abstract_excerpt":"The habitable zone (HZ) is the circumstellar region where standing bodies of liquid water could exist on the surface of a rocky planet. Conventional definitions assume that CO2 and H2O are the only greenhouse gases. The outer edge of this classical N2-CO2-H2O HZ extends out to nearly 1.7 AU in our solar system, beyond which condensation and scattering by CO2 outstrip its greenhouse capacity. We use a single column radiative-convective climate model to assess the greenhouse effect of CH4 (10 to about 100,000 ppm) on the classical habitable zone (N2-CO2-H2O) for main-sequence stars with stellar "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1805.02801","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-05-08T01:58:08Z","cross_cats_sorted":[],"title_canon_sha256":"bd4a54e168b5e50312d0a9756cac77433c3bd2799d7532b164976846f02bc150","abstract_canon_sha256":"7c115769019af9e1ba9c24a17c5e43c9b6d8a9f2ffbf43deaba1963d27aa2f1b"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:15:13.603436Z","signature_b64":"AsgeZIif4LDCJsGjiFK+89ppT/0ZKZqj7TdWeIdyI9ZilIhTArfrFWW7+Gsg35QguQqTka2D8i8cPcDPXg22Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"66a126e0e4e003be7583564ccf38ca20565a3d4b1e5ab5875f26a6c9d3378612","last_reissued_at":"2026-05-18T00:15:13.602696Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:15:13.602696Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A Methane Extension to the Classical Habitable Zone","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Lisa Kaltenegger, Ramses M. Ramirez","submitted_at":"2018-05-08T01:58:08Z","abstract_excerpt":"The habitable zone (HZ) is the circumstellar region where standing bodies of liquid water could exist on the surface of a rocky planet. Conventional definitions assume that CO2 and H2O are the only greenhouse gases. The outer edge of this classical N2-CO2-H2O HZ extends out to nearly 1.7 AU in our solar system, beyond which condensation and scattering by CO2 outstrip its greenhouse capacity. We use a single column radiative-convective climate model to assess the greenhouse effect of CH4 (10 to about 100,000 ppm) on the classical habitable zone (N2-CO2-H2O) for main-sequence stars with stellar "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.02801","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1805.02801","created_at":"2026-05-18T00:15:13.602813+00:00"},{"alias_kind":"arxiv_version","alias_value":"1805.02801v1","created_at":"2026-05-18T00:15:13.602813+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.02801","created_at":"2026-05-18T00:15:13.602813+00:00"},{"alias_kind":"pith_short_12","alias_value":"M2QSNYHE4AB3","created_at":"2026-05-18T12:32:37.024351+00:00"},{"alias_kind":"pith_short_16","alias_value":"M2QSNYHE4AB345MD","created_at":"2026-05-18T12:32:37.024351+00:00"},{"alias_kind":"pith_short_8","alias_value":"M2QSNYHE","created_at":"2026-05-18T12:32:37.024351+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/M2QSNYHE4AB345MDKZGM6OGKEB","json":"https://pith.science/pith/M2QSNYHE4AB345MDKZGM6OGKEB.json","graph_json":"https://pith.science/api/pith-number/M2QSNYHE4AB345MDKZGM6OGKEB/graph.json","events_json":"https://pith.science/api/pith-number/M2QSNYHE4AB345MDKZGM6OGKEB/events.json","paper":"https://pith.science/paper/M2QSNYHE"},"agent_actions":{"view_html":"https://pith.science/pith/M2QSNYHE4AB345MDKZGM6OGKEB","download_json":"https://pith.science/pith/M2QSNYHE4AB345MDKZGM6OGKEB.json","view_paper":"https://pith.science/paper/M2QSNYHE","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1805.02801&json=true","fetch_graph":"https://pith.science/api/pith-number/M2QSNYHE4AB345MDKZGM6OGKEB/graph.json","fetch_events":"https://pith.science/api/pith-number/M2QSNYHE4AB345MDKZGM6OGKEB/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/M2QSNYHE4AB345MDKZGM6OGKEB/action/timestamp_anchor","attest_storage":"https://pith.science/pith/M2QSNYHE4AB345MDKZGM6OGKEB/action/storage_attestation","attest_author":"https://pith.science/pith/M2QSNYHE4AB345MDKZGM6OGKEB/action/author_attestation","sign_citation":"https://pith.science/pith/M2QSNYHE4AB345MDKZGM6OGKEB/action/citation_signature","submit_replication":"https://pith.science/pith/M2QSNYHE4AB345MDKZGM6OGKEB/action/replication_record"}},"created_at":"2026-05-18T00:15:13.602813+00:00","updated_at":"2026-05-18T00:15:13.602813+00:00"}