{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,15]],"date-time":"2026-03-15T00:12:14Z","timestamp":1773533534882,"version":"3.50.1"},"reference-count":50,"publisher":"American Astronomical Society","issue":"1","license":[{"start":{"date-parts":[[2018,6,13]],"date-time":"2018-06-13T00:00:00Z","timestamp":1528848000000},"content-version":"vor","delay-in-days":3,"URL":"https:\/\/iopscience.iop.org\/page\/copyright"},{"start":{"date-parts":[[2018,6,13]],"date-time":"2018-06-13T00:00:00Z","timestamp":1528848000000},"content-version":"tdm","delay-in-days":3,"URL":"https:\/\/iopscience.iop.org\/info\/page\/text-and-data-mining"}],"content-domain":{"domain":["iopscience.iop.org"],"crossmark-restriction":false},"short-container-title":["ApJL"],"published-print":{"date-parts":[[2018,6,10]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>The first detailed chemical abundance analysis of the M-dwarf (M4.0) exoplanet-hosting star Ross 128 is presented here, based upon near-infrared (1.5\u20131.7 <jats:italic>\u03bc<\/jats:italic>m), high-resolution (<jats:italic>R<\/jats:italic>\u00a0\u223c\u00a022,500) spectra from the SDSS Apache Point Galactic Evolution Experiment survey. We determined precise atmospheric parameters <jats:italic>T<\/jats:italic>\n                  <jats:sub>eff<\/jats:sub>\u00a0=\u00a03231\u00a0\u00b1\u00a0100 K, log <jats:italic>g<\/jats:italic>\u00a0=\u00a04.96\u00a0\u00b1\u00a00.11 dex and chemical abundances of eight elements (C, O, Mg, Al, K, Ca, Ti, and Fe), finding Ross 128 to have near solar metallicity ([Fe\/H]\u00a0=\u00a0+0.03 \u00b1 0.09 dex). The derived results were obtained via spectral synthesis (1D LTE) adopting both MARCS and PHOENIX model atmospheres; stellar parameters and chemical abundances derived from the different adopted models do not show significant offsets. Mass\u2013radius modeling of Ross 128b indicates that it lies below the pure-rock composition curve, suggesting that it contains a mixture of rock and iron, with the relative amounts of each set by the ratio of Fe\/Mg. If Ross 128b formed with a subsolar Si abundance, and assuming the planet\u2019s composition matches that of the host star, it likely has a larger core size relative to the Earth despite this producing a planet with a Si\/Mg abundance ratio \u223c34% greater than the Sun. The derived planetary parameters\u2014insolation flux (<jats:italic>S<\/jats:italic>\n                  <jats:sub>Earth<\/jats:sub>\u00a0=\u00a01.79\u00a0\u00b1\u00a00.26) and equilibrium temperature (<jats:italic>T<\/jats:italic>\n                  <jats:sub>eq<\/jats:sub>\u00a0=\u00a0294\u00a0\u00b1\u00a010 K)\u2014support previous findings that Ross 128b is a temperate exoplanet in the inner edge of the habitable zone.<\/jats:p>","DOI":"10.3847\/2041-8213\/aac896","type":"journal-article","created":{"date-parts":[[2018,6,14]],"date-time":"2018-06-14T13:14:58Z","timestamp":1528982098000},"page":"L15","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":31,"title":["Stellar and Planetary Characterization of the Ross 128 Exoplanetary System from APOGEE Spectra"],"prefix":"10.3847","volume":"860","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7883-5425","authenticated-orcid":false,"given":"Diogo","family":"Souto","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8991-3110","authenticated-orcid":false,"given":"Cayman T.","family":"Unterborn","sequence":"additional","affiliation":[]},{"given":"Verne V.","family":"Smith","sequence":"additional","affiliation":[]},{"given":"Katia","family":"Cunha","sequence":"additional","affiliation":[]},{"given":"Johanna","family":"Teske","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6914-7797","authenticated-orcid":false,"given":"Kevin","family":"Covey","sequence":"additional","affiliation":[]},{"given":"B\u00e1rbara","family":"Rojas-Ayala","sequence":"additional","affiliation":[]},{"given":"D. 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The American Astronomical Society. All rights reserved.","name":"copyright_information","label":"Copyright Information"},{"value":"2018-05-11","name":"date_received","label":"Date Received","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2018-05-28","name":"date_accepted","label":"Date Accepted","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2018-06-13","name":"date_epub","label":"Online publication date","group":{"name":"publication_dates","label":"Publication dates"}}]}}