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| Verfasst von: | Winters, Jennifer G. [VerfasserIn]  |
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| | Stürmer, Julian [VerfasserIn] |
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| | Cloutier, Ryan [VerfasserIn] |
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| | Medina, Amber A. [VerfasserIn] |
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| | Irwin, Jonathan M. [VerfasserIn] |
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| | Charbonneau, David [VerfasserIn] |
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| | Astudillo-Defru, Nicola [VerfasserIn] |
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| | Bonfils, Xavier [VerfasserIn] |
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| | Howard, Andrew W. [VerfasserIn] |
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| | Isaacson, Howard [VerfasserIn] |
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| | Bean, Jacob L. [VerfasserIn] |
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| | Seifahrt, Andreas [VerfasserIn] |
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| | Teske, Johanna K. [VerfasserIn] |
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| | Eastman, Jason D. [VerfasserIn] |
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| | Twicken, Joseph D. [VerfasserIn] |
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| | Collins, Karen A. [VerfasserIn] |
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| | Jensen, Eric L. N. [VerfasserIn] |
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| | Quinn, Samuel N. [VerfasserIn] |
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| | Payne, Matthew J. [VerfasserIn] |
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| | Kristiansen, Martti H. [VerfasserIn] |
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| | Spencer, Alton [VerfasserIn] |
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| | Vanderburg, Andrew [VerfasserIn] |
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| | Zechmeister, Mathias [VerfasserIn] |
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| | Weiss, Lauren M. [VerfasserIn] |
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| | Wang, Sharon Xuesong [VerfasserIn] |
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| | Wang, Gavin [VerfasserIn] |
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| | Udry, Stéphane [VerfasserIn] |
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| | Terentev, Ivan A. [VerfasserIn] |
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| Titel: | A second planet transiting LTT 1445A and a determination of the masses of both worlds |
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| Verf.angabe: | Jennifer G. Winters, Julian Stürmer [und weitere Verfasser] |
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| E-Jahr: | 2022 |
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| Jahr: | 2022 March 14 |
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| Umfang: | 18 S. |
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| Fussnoten: | Gesehen am 21.04.2022 |
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| Titel Quelle: | Enthalten in: The astronomical journal |
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| Ort Quelle: | London : Institute of Physics Publ., 1998 |
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| Jahr Quelle: | 2022 |
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| Band/Heft Quelle: | 163(2022), 4, Artikel-ID 168, Seite 1-18 |
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| ISSN Quelle: | 1538-3881 |
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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 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 R ⊕, consistent with an Earth-like composition. For the newly discovered LTT 1445Ac, we measure a mass of 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. |
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| DOI: | doi:10.3847/1538-3881/ac50a9 |
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| URL: | Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.
Volltext: https://doi.org/10.3847/1538-3881/ac50a9 |
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| | DOI: https://doi.org/10.3847/1538-3881/ac50a9 |
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| Datenträger: | Online-Ressource |
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| Sprache: | eng |
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| K10plus-PPN: | 1799303977 |
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| Verknüpfungen: | → Zeitschrift |
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¬A¬ second planet transiting LTT 1445A and a determination of the masses of both worlds / Winters, Jennifer G. [VerfasserIn]; 2022 March 14 (Online-Ressource)
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