{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,2,21]],"date-time":"2025-02-21T09:07:43Z","timestamp":1740128863877,"version":"3.37.3"},"reference-count":75,"publisher":"American Astronomical Society","issue":"2","license":[{"start":{"date-parts":[[2016,1,14]],"date-time":"2016-01-14T00:00:00Z","timestamp":1452729600000},"content-version":"vor","delay-in-days":4,"URL":"https:\/\/iopscience.iop.org\/page\/copyright"},{"start":{"date-parts":[[2016,1,14]],"date-time":"2016-01-14T00:00:00Z","timestamp":1452729600000},"content-version":"tdm","delay-in-days":4,"URL":"https:\/\/iopscience.iop.org\/info\/page\/text-and-data-mining"}],"content-domain":{"domain":["iopscience.iop.org"],"crossmark-restriction":false},"short-container-title":["ApJ"],"published-print":{"date-parts":[[2016,1,10]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n               <jats:p>Kepler-454 (KOI-273) is a relatively bright (<jats:italic>V<\/jats:italic> = 11.69 mag), Sun-like star that hosts a transiting planet candidate in a 10.6 day orbit. From spectroscopy, we estimate the stellar temperature to be 5687\u00a0\u00b1\u00a050 K, its metallicity to be [m\/H] = 0.32\u00a0\u00b1\u00a00.08, and the projected rotational velocity to be <jats:italic>v<\/jats:italic> sin <jats:italic>i<\/jats:italic>\u00a0&lt;\u00a02.4 km s<jats:sup>\u22121<\/jats:sup>. We combine these values with a study of the asteroseismic frequencies from short cadence <jats:italic>Kepler<\/jats:italic> data to estimate the stellar mass to be <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     \n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"apj522153ieqn1.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>, the radius to be 1.066\u00a0\u00b1\u00a00.012 <jats:italic>R<\/jats:italic>\n                  <jats:sub>\u2299<\/jats:sub>, and the age to be <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     \n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"apj522153ieqn2.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula> Gyr. We estimate the radius of the 10.6 day planet as 2.37\u00a0\u00b1\u00a00.13 <jats:italic>R<\/jats:italic>\n                  <jats:sub>\u2295<\/jats:sub>. Using 63 radial velocity observations obtained with the HARPS-N spectrograph on the Telescopio Nazionale Galileo and 36 observations made with the HIRES spectrograph at the Keck Observatory, we measure the mass of this planet to be 6.8\u00a0\u00b1\u00a01.4 <jats:italic>M<\/jats:italic>\n                  <jats:sub>\u2295<\/jats:sub>. We also detect two additional non-transiting companions, a planet with a minimum mass of 4.46\u00a0\u00b1\u00a00.12 <jats:italic>M<\/jats:italic>\n                  <jats:sub>\n                     <jats:italic>J<\/jats:italic>\n                  <\/jats:sub> in a nearly circular 524 day orbit and a massive companion with a period &gt;10 years and mass &gt;12.1 <jats:italic>M<\/jats:italic>\n                  <jats:sub>\n                     <jats:italic>J<\/jats:italic>\n                  <\/jats:sub>. The 12 exoplanets with radii &lt;2.7 <jats:italic>R<\/jats:italic>\n                  <jats:sub>\u2295<\/jats:sub> and precise mass measurements appear to fall into two populations, with those &lt;1.6 <jats:italic>R<\/jats:italic>\n                  <jats:sub>\u2295<\/jats:sub> following an Earth-like composition curve and larger planets requiring a significant fraction of volatiles. With a density of 2.76\u00a0\u00b1\u00a00.73 g cm<jats:sup>\u22123<\/jats:sup>, Kepler-454b lies near the mass transition between these two populations and requires the presence of volatiles and\/or H\/He gas.<\/jats:p>","DOI":"10.3847\/0004-637x\/816\/2\/95","type":"journal-article","created":{"date-parts":[[2016,1,15]],"date-time":"2016-01-15T00:12:40Z","timestamp":1452816760000},"page":"95","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":35,"title":["THE KEPLER-454 SYSTEM: A SMALL, NOT-ROCKY INNER PLANET, A JOVIAN WORLD, AND A DISTANT COMPANION"],"prefix":"10.3847","volume":"816","author":[{"given":"Sara","family":"Gettel","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9003-484X","authenticated-orcid":false,"given":"David","family":"Charbonneau","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8189-0233","authenticated-orcid":false,"given":"Courtney D.","family":"Dressing","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1605-5666","authenticated-orcid":false,"given":"Lars A.","family":"Buchhave","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9332-2011","authenticated-orcid":false,"given":"Xavier","family":"Dumusque","sequence":"additional","affiliation":[]},{"given":"Andrew","family":"Vanderburg","sequence":"additional","affiliation":[]},{"given":"Aldo S.","family":"Bonomo","sequence":"additional","affiliation":[]},{"given":"Luca","family":"Malavolta","sequence":"additional","affiliation":[]},{"given":"Francesco","family":"Pepe","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8863-7828","authenticated-orcid":false,"given":"Andrew Collier","family":"Cameron","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9911-7388","authenticated-orcid":false,"given":"David W.","family":"Latham","sequence":"additional","affiliation":[]},{"given":"St\u00e9phane","family":"Udry","sequence":"additional","affiliation":[]},{"given":"Geoffrey W.","family":"Marcy","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0531-1073","authenticated-orcid":false,"given":"Howard","family":"Isaacson","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8638-0320","authenticated-orcid":false,"given":"Andrew W.","family":"Howard","sequence":"additional","affiliation":[]},{"given":"Guy R.","family":"Davies","sequence":"additional","affiliation":[]},{"given":"Victor Silva","family":"Aguirre","sequence":"additional","affiliation":[]},{"given":"Hans","family":"Kjeldsen","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5943-1460","authenticated-orcid":false,"given":"Timothy R.","family":"Bedding","sequence":"additional","affiliation":[]},{"given":"Eric","family":"Lopez","sequence":"additional","affiliation":[]},{"given":"Laura","family":"Affer","sequence":"additional","affiliation":[]},{"given":"Rosario","family":"Cosentino","sequence":"additional","affiliation":[]},{"given":"Pedro","family":"Figueira","sequence":"additional","affiliation":[]},{"given":"Aldo F. 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