{"paper":{"title":"Deep Thermal Infrared Imaging of HR 8799 bcde: New Atmospheric Constraints and Limits on a Fifth Planet","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.EP","authors_text":"Adam Burrows, Julien H. Girard, Marc Kuchner, Misato Fukagawa, Nikku Madhusudhan, Ray Jayawardhana, Ryan Cloutier, Satoko Sorahana, Scott J. Kenyon, Soko Matsumura, Tae-Soo Pyo, Thayne Currie, Yoichi Itoh","submitted_at":"2014-09-17T20:09:20Z","abstract_excerpt":"We present new $L^\\prime$ (3.8 $\\mu m$) and Br-$\\alpha$ (4.05 $\\mu m$) data and reprocessed archival $L^\\prime$ data for the young, planet-hosting star HR 8799 obtained with Keck/NIRC2, VLT/NaCo and Subaru/IRCS. We detect all four HR 8799 planets in each dataset at a moderate to high signal-to-noise (SNR $\\gtrsim$ 6-15). We fail to identify a fifth planet, \"HR 8799 f\", at $r$ $<$ 15 $AU$ at a 5-$\\sigma$ confidence level: one suggestive, marginally significant residual at 0.2\" is most likely a PSF artifact. Assuming companion ages of 30 $Myr$ and the Baraffe (Spiegel \\& Burrows) planet cooling "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1409.5134","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"}