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Fischer (9), D. W. Latham (2), E. Falco (2), G. \\'A. Bakos (1), G. A. Esquerdo (2), G. Kov\\'acs (4), G. Torres (2), G. W. Marcy (8), H. Isaacson (8), I. Papp (11), J. A. Johnson (2), J. D. Hartman (1), J. L\\'az\\'ar (11), K. Penev (1), L. A. Buchhave (2, M. de Val-Borro (1), P. Hinz (10), P. S\\'ari (11) ((1) Princeton University, R. P. Knox (10), R. W. Noyes (2), S. N. Quinn (6), W. Bhatti (1), Z. Csubry (1)","submitted_at":"2015-10-29T19:48:39Z","abstract_excerpt":"We present the discovery of HAT-P-57b, a P = 2.4653 day transiting planet around a V = 10.465 +- 0.029 mag, Teff = 7500 +- 250 K main sequence A8V star with a projected rotation velocity of v sin i = 102.1 +- 1.3 km s^-1. We measure the radius of the planet to be R = 1.413 +- 0.054 R_J and, based on RV observations, place a 95% confidence upper limit on its mass of M < 1.85 M_J . Based on theoretical stellar evolution models, the host star has a mass and radius of 1.47 +- 0.12 M_sun, and 1.500 +- 0.050 R_sun, respectively. Spectroscopic observations made with Keck-I/HIRES during a partial tran"},"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":"1510.08839","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2015-10-29T19:48:39Z","cross_cats_sorted":[],"title_canon_sha256":"ed783b766c844f6a12df28dc78ba5e80ed113fb98feb4aaabd0333974d591e8b","abstract_canon_sha256":"8f3f98a49027cf6bf1dfdb3fddc8d74e6a92f310577d8c53759cd25734ea6d71"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:24:17.870195Z","signature_b64":"lVEWWv0q831RKH4dO6haFOCL4HZ3kx1uJhkvYMR7ZYuPc6zrVwjZEorU3KT/raQU59sfQuZN4TcolUoXMUWfAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8343c304e8f336ca5ede0c081461cea1c3d2c0c0ae716f6eac913a5591630f8e","last_reissued_at":"2026-05-18T01:24:17.869651Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:24:17.869651Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"HAT-P-57b: A Short-Period Giant Planet Transiting A Bright Rapidly Rotating A8V Star Confirmed Via Doppler Tomography","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"(10) Steward Observatory, (11) Hungarian Astronomical Association), (2) Harvard-Smithsonian CfA, 3), (3) University of Copenhagen, (4) Konkoly Observatory, (5) Google, (6) Georgia State University, (7) University of Hawaii, (8) UC Berkeley, (9) Yale University, A. 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