{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,11]],"date-time":"2025-12-11T09:09:08Z","timestamp":1765444148422,"version":"3.46.0"},"reference-count":85,"publisher":"EDP Sciences","license":[{"start":{"date-parts":[[2025,12,11]],"date-time":"2025-12-11T00:00:00Z","timestamp":1765411200000},"content-version":"vor","delay-in-days":10,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"DOI":"10.13039\/501100000780","name":"European Commission","doi-asserted-by":"publisher","award":["101164189"],"award-info":[{"award-number":["101164189"]}],"id":[{"id":"10.13039\/501100000780","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["A&amp;A"],"accepted":{"date-parts":[[2025,8,29]]},"published-print":{"date-parts":[[2025,12]]},"abstract":"<jats:p>\n                    <jats:italic>Aims.<\/jats:italic>\n                    We aim to refine the fundamental parameters of the TOI-2141 planetary system, which includes a transiting sub-Neptune orbiting a Sun-like star on a relatively long orbit of 18.26 days, by combining new photometric and spectroscopic observations.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:italic>Methods.<\/jats:italic>\n                    We analyzed new space-based photometry from TESS and CHEOPS, as well as 61 radial velocity measurements from HARPS-N. We performed individual and joint photometric and RV analyses using several modeling tools within a Bayesian model comparison framework.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:italic>Results.<\/jats:italic>\n                    We refined the radius and mass of the transiting planet TOI-2141 b to 3.15 \u00b1 0.04\n                    <jats:italic>R<\/jats:italic>\n                    <jats:sub>\u2295<\/jats:sub>\n                    and 20.1 \u00b1 1.6\n                    <jats:italic>M<\/jats:italic>\n                    <jats:sub>\u2295<\/jats:sub>\n                    to levels that are five and two times more precise, respectively, than the previously reported values. Our radial velocity analysis reveals two additional non-transiting companions with orbital periods of 5.46 and 60.45 days. Despite the innermost planet\u2019s high geometric transit probability, we found no evidence of transits in the photometric data.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:italic>Conclusions.<\/jats:italic>\n                    The bulk properties of TOI-2141 b suggest a significant volatile envelope atop an Earth-like core. The modeling indicates a hydrogen-rich atmosphere that could have experienced mild photoevaporation over the system\u2019s history. Planets b and c are believed to exhibit a modest mutual inclination of at least ~2.4\u00b0.\n                  <\/jats:p>","DOI":"10.1051\/0004-6361\/202556515","type":"journal-article","created":{"date-parts":[[2025,9,22]],"date-time":"2025-09-22T18:43:52Z","timestamp":1758566632000},"page":"A174","source":"Crossref","is-referenced-by-count":0,"title":["Improved characterization of the TOI-2141 system: A dense sub-Neptune with non-transiting inner and outer companions"],"prefix":"10.1051","volume":"704","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4671-2957","authenticated-orcid":false,"given":"R.","family":"Luque","sequence":"first","affiliation":[{"name":"Instituto de Astrof\u00edsica de Andaluc\u00eda (IAA-CSIC), Glorieta de la Astronom\u00eda s\/n","place":["Spain"]}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9910-6088","authenticated-orcid":false,"given":"K. W. 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