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Calkins, Perry Berlind, Sam Hadden, Samuel N. Quinn, Saul Rappaport, Tali Khain","submitted_at":"2018-06-21T18:00:48Z","abstract_excerpt":"We report the discovery of a compact multi-planet system orbiting the relatively nearby (78pc) and bright ($K=8.9$) K-star, K2-266 (EPIC248435473). We identify up to six possible planets orbiting K2-266 with estimated periods of P$_b$ = 0.66, P$_{.02}$ = 6.1, P$_c$ = 7.8, P$_d$ = 14.7, P$_e$ = 19.5, and P$_{.06}$ = 56.7 days and radii of R$_P$ = 3.3 R$_{\\oplus}$, 0.646 R$_{\\oplus}$, 0.705 R$_{\\oplus}$, 2.93 R$_{\\oplus}$, 2.73 R$_{\\oplus}$, and 0.90 R$_{\\oplus}$, respectively. We are able to confirm the planetary nature of two of these planets (d & e) from analyzing their transit timing variati"},"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":"1806.08368","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-06-21T18:00:48Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"4aa2c0594efdc4aafd78a9e8775baa89986ff034f9bd1247675bf6819a63e9e9","abstract_canon_sha256":"7e507c2a93a9a63c2d2dfd7edae0ba6c704edccf45133f4fd00dad39ceade83f"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:00:54.851506Z","signature_b64":"OgJ5c9uuitTPOORaUHxrlKq78GPjcatJA7BbvENI7XmDwN4A8QDhgmtfznuQd+bocE3YdkNlKlcyVWMBPxaRAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"542058bd768080171a1c55e3a69a4572694673931ca49cdcc4bbc27f53ec3e6e","last_reissued_at":"2026-05-18T00:00:54.850836Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:00:54.850836Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A Compact Multi-Planet System With A Significantly Misaligned Ultra Short Period Planet","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.EP","authors_text":"Allyson Bieryla, Andrew Mayo, Andrew Vanderburg, Courtney D. 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