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The system has a high space velocity and a very short orbital period of about 67 minutes, well below the usual minimum period for CVs. To explain the existence of this peculiar system, two theories have been proposed. One suggests that SDSS J1507+52 was formed from a detached white-dwarf/brown-dwarf binary. The other theory proposes that the system is a member of the Galactic halo-population.\n  Here, we present ultraviolet spectroscopy of SDS"},"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":"1104.1180","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-04-06T20:00:52Z","cross_cats_sorted":[],"title_canon_sha256":"1df0dc0ad7f7e811137f989366e2a3c4387be11d6a6e4ab5bb36e19efbedd72c","abstract_canon_sha256":"9903ea5d44859951bc344fd780a522ce1de115aec90d2795c4ca29aba0a80915"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:02:37.024861Z","signature_b64":"0voHBhQgTaYBFYnX9rbH1Kl/Ire+TKstX4Oflc6hEwbmbYGSTepBLvecNmEWR8L25/Dsj0GxbwD+GE13gxMtDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0bbfa99ab5d19143a7ee95dc3558cc310dbd6901d2b07a76d1e7d1e8169ab407","last_reissued_at":"2026-05-18T02:02:37.024209Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:02:37.024209Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The cataclysmic variable SDSS J1507+52: An eclipsing period bouncer in the Galactic halo","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Christian Knigge, Helena Uthas, John Thorstensen, Joseph Patterson, Knox S. 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