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dc.contributor.authorWinters, Jennifer G.
dc.contributor.authorCloutier, Ryan
dc.contributor.authorMedina, Amber A.
dc.contributor.authorIrwin, Jonathan M.
dc.contributor.authorCharbonneau, David
dc.contributor.authorAstudillo-Defru, Nicola
dc.contributor.authorBonfils, Xavier
dc.contributor.authorHoward, Andrew W.
dc.contributor.authorIsaacson, Howard
dc.contributor.authorBean, Jacob L.
dc.contributor.authorSeifahrt, Andreas
dc.contributor.authorTeske, Johanna K.
dc.contributor.authorEastman, Jason D.
dc.contributor.authorTwicken, Joseph D.
dc.contributor.authorCollins, Karen A.
dc.contributor.authorJensen, Eric L. N.
dc.contributor.authorQuinn, Samuel N.
dc.contributor.authorPayne, Matthew J.
dc.contributor.authorKristiansen, Martti H.
dc.contributor.authorSpencer, Alton
dc.contributor.authorVanderburg, Andrew
dc.contributor.authorZechmeister, Mathias
dc.contributor.authorWeiss, Lauren M.
dc.contributor.authorWang, Sharon Xuesong
dc.contributor.authorWang, Gavin
dc.contributor.authorUdry, Stéphane
dc.contributor.authorTerentev, Ivan A.
dc.contributor.authorStürmer, Julian
dc.contributor.authorStefánsson, Gudmundur
dc.contributor.authorShporer, Avi
dc.contributor.authorShectman, Stephen
dc.contributor.authorSefako, Ramotholo
dc.contributor.authorSchwengeler, Hans Martin
dc.contributor.authorSchwarz, Richard P.
dc.contributor.authorScarsdale, Nicholas
dc.contributor.authorRubenzahl, Ryan A.
dc.contributor.authorRoy, Arpita
dc.contributor.authorRosenthal, Lee J.
dc.contributor.authorRobertson, Paul
dc.contributor.authorPetigura, Erik A.
dc.contributor.authorPepe, Francesco
dc.contributor.authorOmohundro, Mark
dc.contributor.authorMurphy, Joseph M. Akana
dc.contributor.authorMurgas, Felipe
dc.contributor.authorMočnik, Teo
dc.contributor.authorMontet, Benjamin T.
dc.contributor.authorMennickent, Ronald
dc.contributor.authorMayo, Andrew W.
dc.contributor.authorMassey, Bob
dc.contributor.authorLubin, Jack
dc.contributor.authorLovis, Christophe
dc.contributor.authorLewin, Pablo
dc.contributor.authorKasper, David
dc.contributor.authorKane, Stephen R.
dc.contributor.authorJenkins, Jon M.
dc.contributor.authorHuber, Daniel
dc.contributor.authorHorne, Keith
dc.contributor.authorHill, Michelle L.
dc.contributor.authorGorrini, Paula
dc.contributor.authorGiacalone, Steven
dc.contributor.authorFulton, Benjamin
dc.contributor.authorForveille, Thierry
dc.contributor.authorFigueira, Pedro
dc.contributor.authorFetherolf, Tara
dc.contributor.authorDressing, Courtney
dc.contributor.authorDíaz, Rodrigo F.
dc.contributor.authorDelfosse, Xavier
dc.contributor.authorDalba, Paul A.
dc.contributor.authorDai, Fei
dc.contributor.authorCortés, C. C.
dc.contributor.authorCrossfield, Ian J. M.
dc.contributor.authorCrane, Jeffrey D.
dc.contributor.authorConti, Dennis M.
dc.contributor.authorCollins, Kevin I.
dc.contributor.authorChontos, Ashley
dc.contributor.authorButler, R. Paul
dc.contributor.authorBrown, Peyton
dc.contributor.authorBrady, Madison
dc.contributor.authorBehmard, Aida
dc.contributor.authorBeard, Corey
dc.contributor.authorBatalha, Natalie M.
dc.contributor.authorAlmenara, Jose-Manuel
dc.identifier.citationWinters , J G , Cloutier , R , Medina , A A , Irwin , J M , Charbonneau , D , Astudillo-Defru , N , Bonfils , X , Howard , A W , Isaacson , H , Bean , J L , Seifahrt , A , Teske , J K , Eastman , J D , Twicken , J D , Collins , K A , Jensen , E L N , Quinn , S N , Payne , M J , Kristiansen , M H , Spencer , A , Vanderburg , A , Zechmeister , M , Weiss , L M , Wang , S X , Wang , G , Udry , S , Terentev , I A , Stürmer , J , Stefánsson , G , Shporer , A , Shectman , S , Sefako , R , Schwengeler , H M , Schwarz , R P , Scarsdale , N , Rubenzahl , R A , Roy , A , Rosenthal , L J , Robertson , P , Petigura , E A , Pepe , F , Omohundro , M , Murphy , J M A , Murgas , F , Močnik , T , Montet , B T , Mennickent , R , Mayo , A W , Massey , B , Lubin , J , Lovis , C , Lewin , P , Kasper , D , Kane , S R , Jenkins , J M , Huber , D , Horne , K , Hill , M L , Gorrini , P , Giacalone , S , Fulton , B , Forveille , T , Figueira , P , Fetherolf , T , Dressing , C , Díaz , R F , Delfosse , X , Dalba , P A , Dai , F , Cortés , C C , Crossfield , I J M , Crane , J D , Conti , D M , Collins , K I , Chontos , A , Butler , R P , Brown , P , Brady , M , Behmard , A , Beard , C , Batalha , N M & Almenara , J-M 2022 , ' A second planet transiting LTT 1445A and a determination of the masses of both worlds ' , Astronomical Journal , vol. 163 , no. 4 , 168 .
dc.identifier.otherRIS: urn:6A27543DB568082B8D41261FE708C25D
dc.descriptionK.H. acknowledges support from STFC grant ST/R000824/1.en
dc.description.abstractLTT 1445 is a hierarchical triple M-dwarf star system located at a distance of 6.86 pc. The primary star LTT 1445A (0.257 M⊙) 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 ± 0.25 M⊕ and 1.304-0.060+0.067 R⊕, consistent with an Earth-like composition. For the newly discovered LTT 1445Ac, we measure a mass of 1.54-0.19+0.20 M⊕ and a minimum radius of 1.15 R⊕, 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 M⊙) is likely the source of the 1.4 day rotation period, and star B (0.215 M⊙) 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.
dc.relation.ispartofAstronomical Journalen
dc.subjectQC Physicsen
dc.subjectQB Astronomyen
dc.titleA second planet transiting LTT 1445A and a determination of the masses of both worldsen
dc.typeJournal articleen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. St Andrews Centre for Exoplanet Scienceen
dc.description.statusPeer revieweden

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