Verfasst von: | Sarkis, Paula [VerfasserIn] |
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Caballero, José A. [VerfasserIn] | |
Kaminski, Adrian [VerfasserIn] | |
Quirrenbach, Andreas [VerfasserIn] | |
Henning, Thomas [VerfasserIn] | |
Titel: | The CARMENES search for exoplanets around M dwarfs |
Titelzusatz: | a low-mass planet in the temperate zone of the nearby K2-18 |
Verf.angabe: | Paula Sarkis, Thomas Henning, Martin Kürster, Trifon Trifonov, Mathias Zechmeister, Lev Tal-Or, Guillem Anglada-Escudé, Artie P. Hatzes, Marina Lafarga, Stefan Dreizler, Ignasi Ribas, José A. Caballero, Ansgar Reiners, Matthias Mallonn, Juan C. Morales, Adrian Kaminski, Jesús Aceituno, Pedro J. Amado, Victor J.S. Béjar, Hans-Jürgen Hagen, Sandra Jeffers, Andreas Quirrenbach, Ralf Launhardt, Christopher Marvin, and David Montes |
E-Jahr: | 2018 |
Jahr: | 31 May 2018 |
Fussnoten: | Gesehen am 20.05.2019 |
Titel Quelle: | Enthalten in: The astronomical journal |
Ort Quelle: | London : Institute of Physics Publ., 1998 |
Jahr Quelle: | 2018 |
Band/Heft Quelle: | 155(2018,6) Artikel-Nummer 257, 18 Seiten |
ISSN Quelle: | 1538-3881 |
Abstract: | K2-18 is a nearby M2.5 dwarf, located at 34 pc and hosting a transiting planet that was first discovered by the K2 mission and later confirmed with Spitzer Space Telescope observations. With a radius of ∼2 R ⊕ and an orbital period of ∼33 days, the planet lies in the temperate zone of its host star and receives stellar irradiation similar to that of Earth. Here we perform radial velocity follow-up observations with the visual channel of CARMENES with the goal of determining the mass and density of the planet. We measure a planetary semi-amplitude of K b ∼ 3.5 and a mass of M b ∼ 9 M ⊕, yielding a bulk density around . This indicates a low-mass planet with a composition consistent with a solid core and a volatile-rich envelope. A signal at 9 days was recently reported using radial velocity measurements taken with the HARPS spectrograph. This was interpreted as being due to a second planet. We see a weaker, time- and wavelength-dependent signal in the CARMENES data set and thus favor stellar activity for its origin. K2-18 b joins the growing group of low-mass planets detected in the temperate zone of M dwarfs. The brightness of the host star in the near-infrared makes the system a good target for detailed atmospheric studies with the James Webb Space Telescope. |
DOI: | doi:10.3847/1538-3881/aac108 |
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/aac108 |
DOI: https://doi.org/10.3847/1538-3881/aac108 | |
Datenträger: | Online-Ressource |
Sprache: | eng |
K10plus-PPN: | 1665976632 |
Verknüpfungen: | → Zeitschrift |