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Verfasst von:Stock, Stephan [VerfasserIn]   i
 Kemmer, Jonas [VerfasserIn]   i
 Reffert, Sabine [VerfasserIn]   i
 Trifonov, T. [VerfasserIn]   i
 Kaminski, Adrian [VerfasserIn]   i
 Dreizler, S. [VerfasserIn]   i
 Quirrenbach, Andreas [VerfasserIn]   i
 Caballero, J. A. [VerfasserIn]   i
 Reiners, A. [VerfasserIn]   i
 Jeffers, S. V. [VerfasserIn]   i
 Anglada-Escudé, G. [VerfasserIn]   i
 Ribas, I. [VerfasserIn]   i
 Amado, P. J. [VerfasserIn]   i
 Barrado, D. [VerfasserIn]   i
 Barnes, J. R. [VerfasserIn]   i
 Bauer, F. F. [VerfasserIn]   i
 Berdiñas, Z. M. [VerfasserIn]   i
 Béjar, V. J. S. [VerfasserIn]   i
 Coleman, G. a. L. [VerfasserIn]   i
 Cortés-Contreras, M. [VerfasserIn]   i
 Díez-Alonso, E. [VerfasserIn]   i
 Domínguez-Fernández, A. J. [VerfasserIn]   i
 Espinoza, N. [VerfasserIn]   i
 Haswell, C. A. [VerfasserIn]   i
 Hatzes, A. [VerfasserIn]   i
 Henning, T. [VerfasserIn]   i
 Jenkins, J. S. [VerfasserIn]   i
 Jones, H. R. A. [VerfasserIn]   i
 Kossakowski, D. [VerfasserIn]   i
 Kürster, M. [VerfasserIn]   i
 Lafarga, M. [VerfasserIn]   i
 Lee, M. H. [VerfasserIn]   i
 González, M. J. López [VerfasserIn]   i
 Montes, D. [VerfasserIn]   i
 Morales, J. C. [VerfasserIn]   i
 Morales, N. [VerfasserIn]   i
 Pallé, E. [VerfasserIn]   i
 Pedraz, S. [VerfasserIn]   i
 Rodríguez, E. [VerfasserIn]   i
 Rodríguez-López, C. [VerfasserIn]   i
 Zechmeister, M. [VerfasserIn]   i
Titel:The CARMENES search for exoplanets around M dwarfs
Titelzusatz:characterization of the nearby ultra-compact multiplanetary system YZ Ceti
Verf.angabe:S. Stock, J. Kemmer, S. Reffert, T. Trifonov, A. Kaminski, S. Dreizler, A. Quirrenbach, J.A. Caballero, A. Reiners, S.V. Jeffers, G. Anglada-Escudé, I. Ribas, P.J. Amado, D. Barrado, J.R. Barnes, F.F. Bauer, Z.M. Berdiñas, V.J.S. Béjar, G.a.L. Coleman, M. Cortés-Contreras, E. Díez-Alonso, A.J. Domínguez-Fernández, N. Espinoza, C.A. Haswell, A. Hatzes, T. Henning, J.S. Jenkins, H.R.A. Jones, D. Kossakowski, M. Kürster, M. Lafarga, M.H. Lee, M.J. López González, D. Montes, J.C. Morales, N. Morales, E. Pallé, S. Pedraz, E. Rodríguez, C. Rodríguez-López, M. Zechmeister
E-Jahr:2020
Jahr:01 May 2020
Umfang:19 S.
Fussnoten:Gesehen am 08.07.2020
Titel Quelle:Enthalten in: Astronomy and astrophysics
Ort Quelle:Les Ulis : EDP Sciences, 1969
Jahr Quelle:2020
Band/Heft Quelle:636(2020) Artikel-Nummer A119, 19 Seiten
ISSN Quelle:1432-0746
Abstract:<i>Context.<i/> The nearby ultra-compact multiplanetary system YZ Ceti consists of at least three planets, and a fourth tentative signal. The orbital period of each planet is the subject of discussion in the literature due to strong aliasing in the radial velocity data. The stellar activity of this M dwarf also hampers significantly the derivation of the planetary parameters.<i>Aims.<i/> With an additional 229 radial velocity measurements obtained since the discovery publication, we reanalyze the YZ Ceti system and resolve the alias issues.<i>Methods.<i/> We use model comparison in the framework of Bayesian statistics and periodogram simulations based on a method by Dawson and Fabrycky to resolve the aliases. We discuss additional signals in the RV data, and derive the planetary parameters by simultaneously modeling the stellar activity with a Gaussian process regression model. To constrain the planetary parameters further we apply a stability analysis on our ensemble of Keplerian fits.<i>Results.<i/> We find no evidence for a fourth possible companion. We resolve the aliases: the three planets orbit the star with periods of 2.02 d, 3.06 d, and 4.66 d. We also investigate an effect of the stellar rotational signal on the derivation of the planetary parameters, in particular the eccentricity of the innermost planet. Using photometry we determine the stellar rotational period to be close to 68 d and we also detect this signal in the residuals of a three-planet fit to the RV data and the spectral activity indicators. From our stability analysis we derive a lower limit on the inclination of the system with the assumption of coplanar orbits which is <i>i<i/><sub>min<sub/> = 0.9 deg. From the absence of a transit event with TESS, we derive an upper limit of the inclination of <i>i<i/><sub>max<sub/> = 87.43 deg.<i>Conclusions.<i/> YZ Ceti is a prime example of a system where strong aliasing hindered the determination of the orbital periods of exoplanets. Additionally, stellar activity influences the derivation of planetary parameters and modeling them correctly is important for the reliable estimation of the orbital parameters in this specific compact system. Stability considerations then allow additional constraints to be placed on the planetary parameters.
DOI:doi:10.1051/0004-6361/201936732
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/10.1051/0004-6361/201936732
 Verlag: https://www.aanda.org/articles/aa/abs/2020/04/aa36732-19/aa36732-19.html
 DOI: https://doi.org/10.1051/0004-6361/201936732
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1713943433
Verknüpfungen:→ Zeitschrift

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