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    A Second Planet Transiting LTT 1445A and a Determination of the Masses of Both Worlds

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    Date
    2022
    Author
    Winters, Jennifer
    Cloutier, Ryan
    Medina, Amber
    Irwin, Jonathan
    Charbonneau, David
    Astudillo Defru, Nicola
    Bonfils, Xavier
    Howard, Andrew
    Isaacson, Howard
    Bean, Jacob
    Seifahrt, Andreas
    Teske, Johanna
    Eastman, Jason
    Twicken, Joseph
    Collins, Karen
    Jensen, Eric
    Quinn, Samuel
    Payne, Matthew
    Kristiansen, Martti
    Spencer, Alton
    Vanderburg, Andrew
    Zechmeister, Mathias
    Weiss, Lauren
    Xuesong Wang, Sharon
    Wang, Gavin
    Udry, Stéphane
    Terentev, Ivan
    Stürmer, Julian
    Stefánsson, Gudmundur
    Shporer, Avi
    Shectman, Stephen
    Sefako, Ramotholo
    Martin Schwengeler, Hans
    Schwarz, Richard
    Scarsdale, Nicholas
    Rubenzahl, Ryan
    Roy, Arpita
    Rosenthal, Lee
    Robertson, Paul
    Petigura, Erik
    Pepe, Francesco
    Omohundro, Mark
    Akana Murphy, Joseph
    Murgas, Felipe
    Močnik, Teo
    Montet, Benjamin
    Mennickent, Ronald
    Mayo, Andrew
    Massey, Bob
    Lubin, Jack
    Lovis, Christophe
    Lewin, Pablo
    Kasper, David
    Kane, Stephen
    Jenkins, Jon
    Huber, Daniel
    Horne, Keith
    Hill, Michelle
    Gorrini, Paula
    Giacalone, Steven
    Fulton, Benjamin
    Forveille, Thierry
    Figueira, Pedro
    Fetherolf, Tara
    Dressing, Courtney
    Díaz, Rodrigo
    Delfosse, Xavier
    Dalba, Paul
    Dai, Fei
    Cortés, C.
    Crossfield, Ian
    Crane, Jeffrey
    Conti, Dennis
    Collins, Kevin
    Chontos, Ashley
    Butler, R.
    Brown, Peyton
    Brady, Madison
    Behmard, Aida
    Beard, Corey
    Batalha, Natalie
    Almenara, José Manuel
    Publisher
    The Astronomical Journal
    Description
    Artículo de publicación SCOPUS - WOS
    Metadata
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    Abstract
    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 Me) 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 Me) is likely the source of the 1.4 day rotation period, and star B (0.215 Me) 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.
    URI
    http://repositoriodigital.ucsc.cl/handle/25022009/3032
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    file:///D:/Downloads/Winters_2022_AJ_163_168.pdf
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