{"paper":{"title":"An ancient extrasolar system with five sub-Earth-size planets","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.EP","authors_text":"A. Miglio, A. Sozzetti, C. Baranec, C. J. Burke, C. Karoff, C. Van Laerhoven, D. A. Fischer, D. Huber, D. Ragozzine, D. Stello, E. V. Quintana, G. R. Davies, G. W. Marcy, H. Isaacson, H. Kjeldsen, J. Christensen-Dalsgaard, J. F. Rowe, J. J. Swift, J. M. Brewer, M. Lundkvist, M. N. Lund, N. C. Santos, N. M. Law, R. Handberg, R. Kolbl, R. Riddle, S. Basu, S. D. Kawaler, S. G. Sousa, S. Hekker, T. Arentoft, T. Barclay, T. L. Campante, T. R. Bedding, T. R. White, T. S. Metcalfe, V. Silva Aguirre, V. Zh. Adibekyan, W. Cochran, W. J. Chaplin, Y. P. Elsworth","submitted_at":"2015-01-26T01:25:29Z","abstract_excerpt":"The chemical composition of stars hosting small exoplanets (with radii less than four Earth radii) appears to be more diverse than that of gas-giant hosts, which tend to be metal-rich. This implies that small, including Earth-size, planets may have readily formed at earlier epochs in the Universe's history when metals were more scarce. We report Kepler spacecraft observations of Kepler-444, a metal-poor Sun-like star from the old population of the Galactic thick disk and the host to a compact system of five transiting planets with sizes between those of Mercury and Venus. We validate this syst"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.06227","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}