{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,12]],"date-time":"2026-03-12T00:31:39Z","timestamp":1773275499786,"version":"3.50.1"},"reference-count":113,"publisher":"American Astronomical Society","issue":"4","license":[{"start":{"date-parts":[[2022,3,14]],"date-time":"2022-03-14T00:00:00Z","timestamp":1647216000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2022,3,14]],"date-time":"2022-03-14T00:00:00Z","timestamp":1647216000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/iopscience.iop.org\/info\/page\/text-and-data-mining"}],"funder":[{"name":"NSF","award":["AST-1616624"],"award-info":[{"award-number":["AST-1616624"]}]},{"name":"NASA XRP","award":["AST-1616624"],"award-info":[{"award-number":["AST-1616624"]}]}],"content-domain":{"domain":["iopscience.iop.org"],"crossmark-restriction":false},"short-container-title":["AJ"],"published-print":{"date-parts":[[2022,4,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>LTT 1445 is a hierarchical triple M-dwarf star system located at a distance of 6.86 pc. The primary star LTT 1445A (0.257 <jats:italic>M<\/jats:italic>\n                  <jats:sub>\u2299<\/jats:sub>) is known to host the transiting planet LTT 1445Ab with an orbital period of 5.36 days, making it the second-closest known transiting exoplanet system, and the closest one for which the host is an M dwarf. Using Transiting Exoplanet Survey Satellite data, we present the discovery of a second planet in the LTT 1445 system, with an orbital period of 3.12 days. We combine radial-velocity measurements obtained from the five spectrographs, Echelle Spectrograph for Rocky Exoplanets and Stable Spectroscopic Observations, High Accuracy Radial Velocity Planet Searcher, High-Resolution Echelle Spectrometer, MAROON-X, and Planet Finder Spectrograph to establish that the new world also orbits LTT 1445A. We determine the mass and radius of LTT 1445Ab to be 2.87 \u00b1 0.25 <jats:italic>M<\/jats:italic>\n                  <jats:sub>\u2295<\/jats:sub> and <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" overflow=\"scroll\">\n                        <mml:msubsup>\n                           <mml:mrow>\n                              <mml:mn>1.304<\/mml:mn>\n                           <\/mml:mrow>\n                           <mml:mrow>\n                              <mml:mo>\u2212<\/mml:mo>\n                              <mml:mn>0.060<\/mml:mn>\n                           <\/mml:mrow>\n                           <mml:mrow>\n                              <mml:mo>+<\/mml:mo>\n                              <mml:mn>0.067<\/mml:mn>\n                           <\/mml:mrow>\n                        <\/mml:msubsup>\n                     <\/mml:math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"ajac50a9ieqn1.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>\n                  <jats:italic>R<\/jats:italic>\n                  <jats:sub>\u2295<\/jats:sub>, consistent with an Earth-like composition. For the newly discovered LTT 1445Ac, we measure a mass of <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" overflow=\"scroll\">\n                        <mml:msubsup>\n                           <mml:mrow>\n                              <mml:mn>1.54<\/mml:mn>\n                           <\/mml:mrow>\n                           <mml:mrow>\n                              <mml:mo>\u2212<\/mml:mo>\n                              <mml:mn>0.19<\/mml:mn>\n                           <\/mml:mrow>\n                           <mml:mrow>\n                              <mml:mo>+<\/mml:mo>\n                              <mml:mn>0.20<\/mml:mn>\n                           <\/mml:mrow>\n                        <\/mml:msubsup>\n                     <\/mml:math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"ajac50a9ieqn2.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>\n                  <jats:italic>M<\/jats:italic>\n                  <jats:sub>\u2295<\/jats:sub> and a minimum radius of 1.15 <jats:italic>R<\/jats:italic>\n                  <jats:sub>\u2295<\/jats:sub>, but we cannot determine the radius directly as the signal-to-noise ratio of our light curve permits both grazing and nongrazing configurations. Using MEarth photometry and ground-based spectroscopy, we establish that star C (0.161 <jats:italic>M<\/jats:italic>\n                  <jats:sub>\u2299<\/jats:sub>) is likely the source of the 1.4 day rotation period, and star B (0.215 <jats:italic>M<\/jats:italic>\n                  <jats:sub>\u2299<\/jats:sub>) has a likely rotation period of 6.7 days. We estimate a probable rotation period of 85 days for LTT 1445A. Thus, this triple M-dwarf system appears to be in a special evolutionary stage where the most massive M dwarf has spun down, the intermediate mass M dwarf is in the process of spinning down, while the least massive stellar component has not yet begun to spin down.<\/jats:p>","DOI":"10.3847\/1538-3881\/ac50a9","type":"journal-article","created":{"date-parts":[[2022,3,14]],"date-time":"2022-03-14T13:15:16Z","timestamp":1647263716000},"page":"168","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":44,"title":["A Second Planet Transiting LTT 1445A and a Determination of the Masses of Both Worlds"],"prefix":"10.3847","volume":"163","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6031-9513","authenticated-orcid":true,"given":"Jennifer G.","family":"Winters","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5383-9393","authenticated-orcid":true,"given":"Ryan","family":"Cloutier","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8726-3134","authenticated-orcid":true,"given":"Amber A.","family":"Medina","sequence":"additional","affiliation":[]},{"given":"Jonathan M.","family":"Irwin","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9003-484X","authenticated-orcid":true,"given":"David","family":"Charbonneau","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8462-515X","authenticated-orcid":false,"given":"Nicola","family":"Astudillo-Defru","sequence":"additional","affiliation":[]},{"given":"Xavier","family":"Bonfils","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8638-0320","authenticated-orcid":true,"given":"Andrew W.","family":"Howard","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0531-1073","authenticated-orcid":true,"given":"Howard","family":"Isaacson","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4733-6532","authenticated-orcid":true,"given":"Jacob L.","family":"Bean","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4526-3747","authenticated-orcid":true,"given":"Andreas","family":"Seifahrt","sequence":"additional","affiliation":[]},{"given":"Johanna K.","family":"Teske","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3773-5142","authenticated-orcid":true,"given":"Jason D.","family":"Eastman","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6778-7552","authenticated-orcid":true,"given":"Joseph D.","family":"Twicken","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6588-9574","authenticated-orcid":true,"given":"Karen A.","family":"Collins","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4625-7333","authenticated-orcid":true,"given":"Eric L. 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