| Online-Ressource |
Verfasst von: | Luque, Rafael [VerfasserIn]  |
| Reffert, Sabine [VerfasserIn]  |
| Quirrenbach, Andreas [VerfasserIn]  |
| Wolthoff, Vera [VerfasserIn]  |
Titel: | Precise radial velocities of giant stars |
Titelzusatz: | XIII. A second Jupiter orbiting in 4:3 resonance in the 7 CMa system |
Verf.angabe: | R. Luque, T. Trifonov, S. Reffert, A. Quirrenbach, M.H. Lee, S. Albrecht, M. Fredslund Andersen, V. Antoci, F. Grundahl, C. Schwab, and V. Wolthoff |
E-Jahr: | 2019 |
Jahr: | 06 November 2019 |
Umfang: | 8 S. |
Fussnoten: | Gesehen am 12.02.2020 |
Titel Quelle: | Enthalten in: Astronomy and astrophysics |
Ort Quelle: | Les Ulis : EDP Sciences, 1969 |
Jahr Quelle: | 2019 |
Band/Heft Quelle: | 631(2019) Artikel-Nummer A136, 8 Seiten |
ISSN Quelle: | 1432-0746 |
Abstract: | We report the discovery of a second planet orbiting the K giant star 7 CMa based on 166 high-precision radial velocities obtained with Lick, HARPS, UCLES, and SONG. The periodogram analysis reveals two periodic signals of approximately 745 and 980 d, associated with planetary companions. A double-Keplerian orbital fit of the data reveals two Jupiter-like planets with minimum masses mb sin i ~ 1.9 MJ and mc sini~ 0.9 MJ, orbiting at semimajor axes of ab ~ 1.75 au and ac ~ 2.15 au, respectively. Given the small orbital separation and the large minimum masses of the planets, close encounters may occur within the time baseline of the observations; thus, a more accurate N-body dynamical modeling of the available data is performed. The dynamical best-fit solution leads to collision of the planets and we explore the long-term stable configuration of the system in a Bayesian framework, confirming that 13% of the posterior samples are stable for at least 10 Myr. The result from the stability analysis indicates that the two planets are trapped in a low-eccentricity 4:3 mean motion resonance. This is only the third discovered system to be inside a 4:3 resonance, making this discovery very valuable for planet formation and orbital evolution models. |
DOI: | doi:10.1051/0004-6361/201936464 |
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/10.1051/0004-6361/201936464 |
| Verlag: https://www.aanda.org/articles/aa/abs/2019/11/aa36464-19/aa36464-19.html |
| DOI: https://doi.org/10.1051/0004-6361/201936464 |
Datenträger: | Online-Ressource |
Sprache: | eng |
K10plus-PPN: | 168988116X |
Verknüpfungen: | → Zeitschrift |
Precise radial velocities of giant stars / Luque, Rafael [VerfasserIn]; 06 November 2019 (Online-Ressource)