{"paper":{"title":"Fast orbital decays of black hole X-ray binaries: XTE J1118+480 and A0620--00","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA","astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"J. Casares, J. I. Gonz\\'alez Hern\\'andez, R. Rebolo","submitted_at":"2013-11-21T14:12:38Z","abstract_excerpt":"We present new 10.4m-GTC/OSIRIS spectroscopic observations of the black hole X-ray binary \\mbox{XTE J1118+480} that confirm the orbital period decay at $\\dot P=-1.90\\pm0.57$ ms yr$^{-1}$. This corresponds to a period change of $-0.88\\pm0.27$ $\\mu $s per orbital cycle. We have also collected observations of the black hole X-ray binary A0620--00 to derive an orbital period derivative of $\\dot P=-0.60\\pm0.08$ ms yr$^{-1}$ ($-0.53\\pm0.07$ $\\mu $s/cycle). Angular momentum losses due to gravitational radiation are unable to explain these large orbital decays in these two short-period black hole bina"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1311.5412","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"}