{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2013:F3ER7XJGE4B4JHUN7Q6MQ2X5UV","short_pith_number":"pith:F3ER7XJG","schema_version":"1.0","canonical_sha256":"2ec91fdd262703c49e8dfc3cc86afda57892fb955b9fd42dba27382b78acf18e","source":{"kind":"arxiv","id":"1308.1660","version":2},"attestation_state":"computed","paper":{"title":"Near-polytropic simulations with a radiative surface","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Atefeh Barekat (NORDITA, Axel Brandenburg (NORDITA, MPS), SU, SU)","submitted_at":"2013-08-07T19:14:27Z","abstract_excerpt":"Studies of solar and stellar convection often employ simple polytropic setups using the diffusion approximation instead of solving the proper radiative transfer equation. This allows one to control separately the polytropic index of the hydrostatic reference solution, the temperature contrast between top and bottom, and the Rayleigh and Peclet numbers. We extend such studies by including radiative transfer in the gray approximation using a Kramers-like opacity with freely adjustable coefficients. We study the properties of such models and compare them with results from the diffusion approximat"},"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":"1308.1660","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-08-07T19:14:27Z","cross_cats_sorted":[],"title_canon_sha256":"38c5320a483bafe3f128af09e2a68338e4328a7c4be976742b6880c857f7b48b","abstract_canon_sha256":"0308d6fd67190219eae9d54a1cd60f80e85df3db5792ab1cbaf1541bdc453c10"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:37:44.808655Z","signature_b64":"tb61qn6mN6+hTnTXAwX9YuXzL6rpNuR+AsjCWWJgOH2w7bpbCYTF8Xye2tKitphKPkCuIfdgjGMf4dLLjvhCBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2ec91fdd262703c49e8dfc3cc86afda57892fb955b9fd42dba27382b78acf18e","last_reissued_at":"2026-05-18T02:37:44.808180Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:37:44.808180Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Near-polytropic simulations with a radiative surface","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Atefeh Barekat (NORDITA, Axel Brandenburg (NORDITA, MPS), SU, SU)","submitted_at":"2013-08-07T19:14:27Z","abstract_excerpt":"Studies of solar and stellar convection often employ simple polytropic setups using the diffusion approximation instead of solving the proper radiative transfer equation. This allows one to control separately the polytropic index of the hydrostatic reference solution, the temperature contrast between top and bottom, and the Rayleigh and Peclet numbers. We extend such studies by including radiative transfer in the gray approximation using a Kramers-like opacity with freely adjustable coefficients. We study the properties of such models and compare them with results from the diffusion approximat"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.1660","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1308.1660","created_at":"2026-05-18T02:37:44.808253+00:00"},{"alias_kind":"arxiv_version","alias_value":"1308.1660v2","created_at":"2026-05-18T02:37:44.808253+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.1660","created_at":"2026-05-18T02:37:44.808253+00:00"},{"alias_kind":"pith_short_12","alias_value":"F3ER7XJGE4B4","created_at":"2026-05-18T12:27:43.054852+00:00"},{"alias_kind":"pith_short_16","alias_value":"F3ER7XJGE4B4JHUN","created_at":"2026-05-18T12:27:43.054852+00:00"},{"alias_kind":"pith_short_8","alias_value":"F3ER7XJG","created_at":"2026-05-18T12:27:43.054852+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/F3ER7XJGE4B4JHUN7Q6MQ2X5UV","json":"https://pith.science/pith/F3ER7XJGE4B4JHUN7Q6MQ2X5UV.json","graph_json":"https://pith.science/api/pith-number/F3ER7XJGE4B4JHUN7Q6MQ2X5UV/graph.json","events_json":"https://pith.science/api/pith-number/F3ER7XJGE4B4JHUN7Q6MQ2X5UV/events.json","paper":"https://pith.science/paper/F3ER7XJG"},"agent_actions":{"view_html":"https://pith.science/pith/F3ER7XJGE4B4JHUN7Q6MQ2X5UV","download_json":"https://pith.science/pith/F3ER7XJGE4B4JHUN7Q6MQ2X5UV.json","view_paper":"https://pith.science/paper/F3ER7XJG","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1308.1660&json=true","fetch_graph":"https://pith.science/api/pith-number/F3ER7XJGE4B4JHUN7Q6MQ2X5UV/graph.json","fetch_events":"https://pith.science/api/pith-number/F3ER7XJGE4B4JHUN7Q6MQ2X5UV/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/F3ER7XJGE4B4JHUN7Q6MQ2X5UV/action/timestamp_anchor","attest_storage":"https://pith.science/pith/F3ER7XJGE4B4JHUN7Q6MQ2X5UV/action/storage_attestation","attest_author":"https://pith.science/pith/F3ER7XJGE4B4JHUN7Q6MQ2X5UV/action/author_attestation","sign_citation":"https://pith.science/pith/F3ER7XJGE4B4JHUN7Q6MQ2X5UV/action/citation_signature","submit_replication":"https://pith.science/pith/F3ER7XJGE4B4JHUN7Q6MQ2X5UV/action/replication_record"}},"created_at":"2026-05-18T02:37:44.808253+00:00","updated_at":"2026-05-18T02:37:44.808253+00:00"}