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Persson","submitted_at":"2011-10-19T19:04:57Z","abstract_excerpt":"Using two epochs of 4.5um images from the Infrared Array Camera (IRAC) on board the Spitzer Space Telescope, we recently identified a common proper motion companion to the white dwarf WD 0806-661 that is a candidate for the coldest known brown dwarf. To verify its cool nature, we have obtained images of this object at 3.6um with IRAC, at J with HAWK-I on the Very Large Telescope, and in a filter covering the red half of J with FourStar on Magellan. WD 0806-661 B is detected by IRAC but not HAWK-I or FourStar. From these data we measure colors of [3.6]-[4.5]=2.77+/-0.16 and J-[4.5]>7.0 (SNR<3)."},"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":"1110.4353","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-10-19T19:04:57Z","cross_cats_sorted":[],"title_canon_sha256":"ec5992b1446ca8da98292446ca66cee8af95c8b29752b37194b9b54cf1e685be","abstract_canon_sha256":"18a2045afb17d132eeb56f74aa5b1e409e75c7a72ebd852530335af890bdaa72"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:00:08.461277Z","signature_b64":"ZrILYNcdSfgereflFq1CpPWSQvP0YBupjvVvg7/eVDf6kPdOIHfAspusylP0NkeAfm+Y1PQAPsPj+0VESP6/Ag==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ef7f2a332b5178a38a0f3afce7014c4543dc6885a8d5393d99ed09ee66ec46bf","last_reissued_at":"2026-05-18T02:00:08.460672Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:00:08.460672Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Confirmation of One of the Coldest Known Brown Dwarfs","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A. 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