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At a distance of 6.9 pc, it is the second nearest transiting exoplanet system found to date, and the closest one known for which the primary is an M dwarf. The host stellar system consists of three mid-to-late M dwarfs in a hierarchical configuration, which are blended in one <jats:italic>TESS<\/jats:italic>\u00a0pixel. We use MEarth data and results from the Science Processing Operations Center data validation report to determine that the planet transits the primary star in the system. The planet has a radius of <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"ajab364dieqn1.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>\n                  <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"ajab364dieqn2.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>, an orbital period of <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"ajab364dieqn3.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>\u00a0days, and an equilibrium temperature of <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"ajab364dieqn4.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>\u00a0K. With radial velocities from the High Accuracy Radial Velocity Planet Searcher, we place a 3<jats:italic>\u03c3<\/jats:italic> upper mass limit of 8.4\u00a0<jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"ajab364dieqn5.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>\u00a0on the planet. LTT\u00a01445Ab provides one of the best opportunities to date for the spectroscopic study of the atmosphere of a terrestrial world. We also present a detailed characterization of the host stellar system. We use high-resolution spectroscopy and imaging to rule out the presence of any other close stellar or brown dwarf companions. Nineteen years of photometric monitoring of A and BC indicate a moderate amount of variability, in agreement with that observed in the <jats:italic>TESS<\/jats:italic>\u00a0light-curve data. We derive a preliminary astrometric orbit for the BC pair that reveals an edge-on and eccentric configuration. The presence of a transiting planet in this system hints that the entire system may be co-planar, implying that the system may have formed from the early fragmentation of an individual protostellar core.<\/jats:p>","DOI":"10.3847\/1538-3881\/ab364d","type":"journal-article","created":{"date-parts":[[2019,9,23]],"date-time":"2019-09-23T21:13:14Z","timestamp":1569273194000},"page":"152","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":81,"title":["Three Red Suns in the Sky: A Transiting, Terrestrial Planet in a Triple M-dwarf System at 6.9 pc"],"prefix":"10.3847","volume":"158","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6031-9513","authenticated-orcid":false,"given":"Jennifer G.","family":"Winters","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8726-3134","authenticated-orcid":false,"given":"Amber A.","family":"Medina","sequence":"additional","affiliation":[]},{"given":"Jonathan 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