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We detect absorption lines from the sub-stellar donor star in this system, which contributes 38 +/- 5% to the J-band light. From the relative strengths of the absorption lines in the J-band, we estimate the spectral type of the donor star to be L2 +/- 1. These data are the first spectroscopic detection of a confirmed sub-stellar donor in a cataclysmic variable, and the spectral type is consistent with that expected from semi-empirical evolutionary models.\n  Using skew mapping, we hav"},"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":"1303.0715","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-03-04T14:54:42Z","cross_cats_sorted":[],"title_canon_sha256":"6a6cb58b95d050bdcc54cf61fbd1c0fa03487b410152f304a59e54e048f016bb","abstract_canon_sha256":"59e0da3f0928e5cc180f76f70ac9e16be7133d0c212a5666ae460b64f392541d"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:51:17.391701Z","signature_b64":"MGKTUA7atS4gziZcbpvJplYWP+BxJs2tFn3IXoHGttCn5zBkKfXo30hDPSITSYP17/8lRBJ9gowoTp5vAFB/Ag==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4c89444b32e71c2071059286a00e52e31ea92ad1128ae97a89dc002b23baef96","last_reissued_at":"2026-05-18T01:51:17.391102Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:51:17.391102Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A J-band detection of the sub-stellar mass donor in SDSS J1433+1011","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"B.T. 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