{"paper":{"title":"HAT-P-4b: A metal-rich low-density transiting hot Jupiter","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"(2) CfA, 3), (3) Hubble Fellow, 4), (4) INAF - Osservatorio Astronomico di Torino, (5) Department of Terrestrial Magnetism, (6) Department of Astronomy, (9) Hungarian Astronomical Association), A. Pal (8), A. Sozzetti (2, Berkeley (7) Department of Physics & Astronomy, Carnegie Institute of Washington DC, D. A. Fischer (7), D. D. Sasselov (2), D. W. Latham (2), E\\\"otv\\\"os Lor\\'and University, G. A. Bakos (2, G. Esquerdo (2), G. Kovacs (1), G. Torres (2), G. W. Marcy (6), I. Papp (9), J. Lazar (9), J. M. Fernandez (2), P. Sari (9) ((1) Konkoly Observatory, R. P. Butler (5), R. P. Stefanik (2), R. W. Noyes (2), San Francisco State University (8) Department of Astronomy, University of California","submitted_at":"2007-10-02T19:05:36Z","abstract_excerpt":"We describe the discovery of HAT-P-4b, a low-density extrasolar planet transiting BD+36 2593, a V = 11.2 mag slightly evolved metal-rich late F star. The planet's orbital period is 3.056536+/-0.000057 d with a mid-transit epoch of 2,454,245.8154 +/- 0.0003 (HJD). Based on high-precision photometric and spectroscopic data, and by using transit light curve modeling, spectrum analysis and evolutionary models, we derive the following planet parameters: Mp= 0.68 +/- 0.04 MJ, Rp= 1.27 +/- 0.05 RJ, rho = 0.41 +/- 0.06 g cm-3 and a = 0.0446 +/- 0.0012 AU. Because of its relatively large radius, togeth"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0710.0602","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"}