{"paper":{"title":"A New WZ Sagittae-type Dwarf Nova KSP-OT-202104a Near the Period Minimum from the KMTNet Supernova Program","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"A new WZ Sagittae-type dwarf nova KSP-OT-202104a shows a superhump period of 71.7 minutes, placing it below the orbital period minimum and on a path toward AM CVn stars.","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.SR","authors_text":"Dae-Sik Moon, Hong Soo Park, Hyobin Im, Nan Jiang, Sang Chul Kim, Youngdae Lee, Yuan Qi Ni","submitted_at":"2026-05-12T20:27:51Z","abstract_excerpt":"We present photometric and spectroscopic studies of a new WZ Sagittae (Sge)-type dwarf nova (DN) KSP-OT-202104a discovered by the Korea Microlensing Telescope Network Supernova Program. The source exhibits outburst amplitudes of $\\sim 8$ mag with a duration of $\\sim 28.5$ days in the $V$-band. It is a type D DN among WZ Sge-types, and we estimate the superhump period to be $P_{\\rm sh} \\approx 71.7$ minutes ($=0.04978$ days). Its spectrum shows blue continuum as often found in optically-thick accretion disks of DNe during outbursts with hydrogen absorption lines from H$\\beta$ to H$\\zeta$. Since"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"we consider that this target would belong to the small sample of DNe below the period minimum and may be evolving toward AM Canum Venaticorum (AM CVn) stars. This system therefore adds an example of a short-period dwarf nova with a low mass-transfer rate to the known sample.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"Since the orbital period in WZ Sge-type DNe is typically very close to the superhump period, we consider that this target would belong to the small sample of DNe below the period minimum.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Discovery of KSP-OT-202104a, a new WZ Sge-type dwarf nova with P_sh ≈ 71.7 min likely below the period minimum and evolving toward AM CVn.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"A new WZ Sagittae-type dwarf nova KSP-OT-202104a shows a superhump period of 71.7 minutes, placing it below the orbital period minimum and on a path toward AM CVn stars.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"1c40e794f052b8e5b83351e85acf1b611f2ade445c0b7d7400ff1fd4c42a161f"},"source":{"id":"2605.12722","kind":"arxiv","version":1},"verdict":{"id":"13867cde-0eb4-4b10-ae3a-06ee0827ee28","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-14T19:35:26.628031Z","strongest_claim":"we consider that this target would belong to the small sample of DNe below the period minimum and may be evolving toward AM Canum Venaticorum (AM CVn) stars. This system therefore adds an example of a short-period dwarf nova with a low mass-transfer rate to the known sample.","one_line_summary":"Discovery of KSP-OT-202104a, a new WZ Sge-type dwarf nova with P_sh ≈ 71.7 min likely below the period minimum and evolving toward AM CVn.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"Since the orbital period in WZ Sge-type DNe is typically very close to the superhump period, we consider that this target would belong to the small sample of DNe below the period minimum.","pith_extraction_headline":"A new WZ Sagittae-type dwarf nova KSP-OT-202104a shows a superhump period of 71.7 minutes, placing it below the orbital period minimum and on a path toward AM CVn stars."},"references":{"count":110,"sample":[{"doi":"10.3847/1538-4357/ab2be6","year":2019,"title":"Afsariardchi, N., Moon, D.-S., Drout, M. R., et al. 2019, ApJ, 881, 22, doi: 10.3847/1538-4357/ab2be6 Astropy Collaboration, Robitaille, T. P., Tollerud, E. J., et al. 2013, A&A, 558, A33, doi: 10.105","work_id":"b70aa036-0c3d-44b2-944f-69bf4dc3220e","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":1996,"title":"1996, A&A, 311, 889","work_id":"29571cb2-773e-4cdc-bf22-8aa45d7e723b","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":1993,"title":"Augusteijn, T., van Kerkwijk, M. H., & van Paradijs, J. 1993, A&A, 267, L55","work_id":"f6d60653-69f9-4aa8-bd8e-e1355b630ef4","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.1093/mnras/staf173","year":2025,"title":"T., Breedt, E., et al","work_id":"c971dc31-0f01-422e-bbd1-17fb73904368","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.1093/pasj/54.1.l7","year":2002,"title":"2002, PASJ, 54, L7, doi: 10.1093/pasj/54.1.L7","work_id":"9d18edfd-6108-4776-a9e8-323a9467e258","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":110,"snapshot_sha256":"59891d0879afc669747e8ee7ec49b6afe8130eb2be7e3106a235a1a120452318","internal_anchors":3},"formal_canon":{"evidence_count":2,"snapshot_sha256":"3d876d011c5dc2bf9dc543c52300a368114f0f4fac8f5ba734777f9bd7cb149e"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}