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| Verfasst von: | Stock, Stephan [VerfasserIn]  |
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| | Nagel, E. [VerfasserIn] |
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| | Kemmer, Jonas [VerfasserIn] |
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| | Passegger, V. M. [VerfasserIn] |
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| | Reffert, Sabine [VerfasserIn] |
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| | Quirrenbach, Andreas [VerfasserIn] |
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| | Caballero, J. A. [VerfasserIn] |
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| | Czesla, S. [VerfasserIn] |
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| | Béjar, V. J. S. [VerfasserIn] |
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| | Cardona, C. [VerfasserIn] |
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| | Díez-Alonso, E. [VerfasserIn] |
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| | Herrero, E. [VerfasserIn] |
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| | Lalitha, S. [VerfasserIn] |
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| | Schlecker, M. [VerfasserIn] |
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| | Tal-Or, L. [VerfasserIn] |
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| | Rodríguez, E. [VerfasserIn] |
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| | Rodríguez-López, C. [VerfasserIn] |
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| | Ribas, I. [VerfasserIn] |
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| | Reiners, A. [VerfasserIn] |
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| | Amado, P. J. [VerfasserIn] |
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| | Bauer, F. F. [VerfasserIn] |
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| | Bluhm, Paz [VerfasserIn] |
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| | Cortés-Contreras, M. [VerfasserIn] |
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| | González-Cuesta, L. [VerfasserIn] |
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| | Dreizler, S. [VerfasserIn] |
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| | Hatzes, A. P. [VerfasserIn] |
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| | Henning, Thomas [VerfasserIn] |
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| | Jeffers, S. V. [VerfasserIn] |
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| | Kaminski, Adrian [VerfasserIn] |
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| | Kürster, M. [VerfasserIn] |
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| | Lafarga, M. [VerfasserIn] |
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| | López-González, M. J. [VerfasserIn] |
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| | Montes, D. [VerfasserIn] |
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| | Morales, J. C. [VerfasserIn] |
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| | Pedraz, S. [VerfasserIn] |
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| | Schöfer, P. [VerfasserIn] |
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| | Schweitzer, A. [VerfasserIn] |
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| | Trifonov, T. [VerfasserIn] |
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| | Osorio, M. R. Zapatero [VerfasserIn] |
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| | Zechmeister, M. [VerfasserIn] |
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| Titel: | The CARMENES search for exoplanets around M dwarfs |
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| Titelzusatz: | three temperate-to-warm super-Earths |
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| Verf.angabe: | S. Stock, E. Nagel, J. Kemmer, V.M. Passegger, S. Reffert, A. Quirrenbach, J.A. Caballero, S. Czesla, V.J.S. Béjar, C. Cardona, E. Díez-Alonso, E. Herrero, S. Lalitha, M. Schlecker, L. Tal-Or, E. Rodríguez, C. Rodríguez-López, I. Ribas, A. Reiners, P.J. Amado, F.F. Bauer, P. Bluhm, M. Cortés-Contreras, L. González-Cuesta, S. Dreizler, A.P. Hatzes, Th. Henning, S.V. Jeffers, A. Kaminski, M. Kürster, M. Lafarga, M.J. López-González, D. Montes, J.C. Morales, S. Pedraz, P. Schöfer, A. Schweitzer, T. Trifonov, M.R. Zapatero Osorio, and M. Zechmeister |
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| E-Jahr: | 2020 |
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| Jahr: | 10 November 2020 |
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| Umfang: | 35 S. |
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| Teil: | volume:643 |
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| | year:2020 |
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| | extent:35 |
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| Fussnoten: | Gesehen am 28.01.2021 |
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| Titel Quelle: | Enthalten in: Astronomy and astrophysics |
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| Ort Quelle: | Les Ulis : EDP Sciences, 1969 |
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| Jahr Quelle: | 2020 |
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| Band/Heft Quelle: | 643(2020) Artikel-Nummer A112, 35 Seiten |
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| ISSN Quelle: | 1432-0746 |
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| Abstract: | We announce the discovery of two planets orbiting the M dwarfs GJ 251 (0.360 ± 0.015<i>M<i/><sub>⊙<sub/>) and HD 238090 (0.578 ± 0.021<i>M<i/><sub>⊙<sub/>) based on CARMENES radial velocity (RV) data. In addition, we independently confirm with CARMENES data the existence of Lalande 21185 b, a planet that has recently been discovered with the SOPHIE spectrograph. All three planets belong to the class of warm or temperate super-Earths and share similar properties. The orbital periods are 14.24 d, 13.67 d, and 12.95 d and the minimum masses are 4.0 ± 0.4 <i>M<i/><sub>⊕<sub/>, 6.9 ± 0.9 <i>M<i/><sub>⊕<sub/>, and 2.7 ± 0.3 <i>M<i/><sub>⊕<sub/> for GJ 251 b, HD 238090 b, and Lalande 21185 b, respectively. Based on the orbital and stellar properties, we estimate equilibrium temperatures of 351.0 ± 1.4 K for GJ 251 b, 469.6 ± 2.6 K for HD 238090 b, and 370.1 ± 6.8 K for Lalande 21185 b. For the latter we resolve the daily aliases that were present in the SOPHIE data and that hindered an unambiguous determination of the orbital period. We find no significant signals in any of our spectral activity indicators at the planetary periods. The RV observations were accompanied by contemporaneous photometric observations. We derive stellar rotation periods of 122.1 ± 2.2 d and 96.7 ± 3.7 d for GJ 251 and HD 238090, respectively. The RV data of all three stars exhibit significant signals at the rotational period or its first harmonic. For GJ 251 and Lalande 21185, we also find long-period signals around 600 d, and 2900 d, respectively, which we tentatively attribute to long-term magnetic cycles. We apply a Bayesian approach to carefully model the Keplerian signals simultaneously with the stellar activity using Gaussian process regression models and extensively search for additional significant planetary signals hidden behind the stellar activity. Current planet formation theories suggest that the three systems represent a common architecture, consistent with formation following the core accretion paradigm. |
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| DOI: | doi:10.1051/0004-6361/202038820 |
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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 ; Verlag: https://doi.org/10.1051/0004-6361/202038820 |
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| | Volltext: https://www.aanda.org/articles/aa/abs/2020/11/aa38820-20/aa38820-20.html |
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| | DOI: https://doi.org/10.1051/0004-6361/202038820 |
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| Datenträger: | Online-Ressource |
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| Sprache: | eng |
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| K10plus-PPN: | 174588842X |
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| Verknüpfungen: | → Zeitschrift |
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¬The¬ CARMENES search for exoplanets around M dwarfs / Stock, Stephan [VerfasserIn]; 10 November 2020 (Online-Ressource)
