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Weak K, Na, and FeH features as well as strong VO absorption in the integrated-light J-band spectrum indicate a young age for the system.  From spatially resolved K-band spectra we determine spectral types of L3 and L5 for components A and B, respectively.  SDSS J2249+0044A is spectrally very similar to G196-3B, an L3 companion to a young M2.5 field dwarf.  Thus, we adopt 100 Myr (the age estimate of the G196-3 system) as the age of SDSS J2249"},"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":"0912.4687","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-12-23T16:52:32Z","cross_cats_sorted":[],"title_canon_sha256":"d534c75ccb005198c6da94aebb6e84be2fac7bcc9947caf4b8b017e73ac0f879","abstract_canon_sha256":"613e92b96a76dc19b6c02ea84780dd94e846886d21b0ce0405a3dfcd48a94ba3"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:33:55.498715Z","signature_b64":"oiF8kJ4UsjDcQE3eSaNa28GCoIcJLUi52RbSLuh77ejVwwxkbPZd3j0TG21O4+ypqYkmRroioOHv5Z4glXpBDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8c140d57e8dabd084828e58c59104c4a876bc124bcf3d3398e6e813fdaeaae5c","last_reissued_at":"2026-05-18T02:33:55.498254Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:33:55.498254Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Discovery of a Young L Dwarf Binary, SDSS J224953.47+004404.6AB","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"K. 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