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These models predict higher polarization at shorter wavelengths. We discuss the polarization in the R and I band of 4 ultra cool dwarfs. Methods.We report linear polarization measurements of 4 ultra cool dwarfs in the R and I bands using the Intermediate dispersion Spectrograph and Imaging System (ISIS) mounted on the 4.2m William Herschel Telescope (WHT). Results.As predicted by theoretical models, we find a higher degree of polarization"},"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":"0910.5400","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-10-28T15:10:03Z","cross_cats_sorted":[],"title_canon_sha256":"e2ef547215f572c81daf747e087acc20a92de33dc1c0c3f57e7ac86888e44ec5","abstract_canon_sha256":"f52a244f8d17fc5d6e6b1dc7beac3166feddb628baeac202aa88c4c7971f18ee"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:11:02.141996Z","signature_b64":"hP5kXxnWLlQToLSyc+KOHtg6IdqQNZ4xOddHnUiRZrNEdED701jIC2o1wabRHt9WkblQOxhRT94BDjanuOuhCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e48dce7e24ec509e02a1dd14e6171b8583ef51533228ee395de85ea5891f35f9","last_reissued_at":"2026-05-18T02:11:02.141048Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:11:02.141048Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Optical linear polarization in ultra cool dwarfs: A tool to probe dust in the ultra cool dwarf atmospheres","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"E. 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