{"paper":{"title":"Gemini Planet Imager Observational Calibrations VII: On-Sky Polarimetric Performance of the Gemini Planet Imager","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.EP"],"primary_cat":"astro-ph.IM","authors_text":"Andrew Cardwell, Bruce A. Macintosh, Dmitry Savransky, Fredrik Rantakyr\\\"o, Inseok Song, James R. Graham, Jeffrey K. Chilcote, J\\'er\\^ome Maire, Markus Hartung, Marshall D. Perrin, Max Millar-Blanchaer, Michael P. Fitzgerald, Naru Sadakuni, Pascale Hibon, Patrick Ingraham, Sandrine J. Thomas, Sloane J. Wiktorowicz, Stephen J. Goodsell, the GPI team, Zachary H. Draper","submitted_at":"2014-07-09T00:02:09Z","abstract_excerpt":"We present on-sky polarimetric observations with the Gemini Planet Imager (GPI) obtained at straight Cassegrain focus on the Gemini South 8-m telescope. Observations of polarimetric calibrator stars, ranging from nearly unpolarized to strongly polarized, enable determination of the combined telescope and instrumental polarization. We find the conversion of Stokes $I$ to linear and circular instrumental polarization in the instrument frame to be $I \\rightarrow (Q_{\\rm IP}, U_{\\rm IP}, P_{\\rm IP}, V_{\\rm IP}) = (-0.037 \\pm 0.010\\%, +0.4338 \\pm 0.0075\\%, 0.4354 \\pm 0.0075\\%, -6.64 \\pm 0.56\\%)$. S"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.2307","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1407.2307/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}