The CARMENES search for exoplanets around M dwarfs

被引：0
|
作者：
von Stauffenberg, A. [1 ,2 ]
Trifonov, T. [1 ,3 ,4 ]
Quirrenbach, A. [1 ]
Reffert, S. [1 ]
Kaminski, A. [1 ]
Dreizler, S. [5 ]
Ribas, I. [6 ,7 ]
Reiners, A. [5 ]
Kuerster, M. [3 ]
Twicken, J. D. [8 ,9 ]
Rapetti, D. [9 ,10 ]
Caballero, J. A. [11 ]
Amado, P. J. [12 ]
Bejar, V. J. S. [13 ,14 ]
Cifuentes, C. [11 ]
Gongora, S. [15 ]
Hatzes, A. P. [16 ]
Henning, Th. [3 ]
Montes, D. [17 ,18 ]
Morales, J. C. [6 ,7 ]
Schweitzer, A. [19 ]
机构：
[1] Zent Astron Univ Heidelberg, Landessternwarte, Konigstuhl 12, D-69117 Heidelberg, Germany
[2] Univ Coll Dublin, Sch Phys, Dublin, Ireland
[3] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
[4] Sofia Univ St Kliment Ohridski, Dept Astron, Fac Phys, 5 James Bourchier Blvd, BG-1164 Sofia, Bulgaria
[5] Georg August Univ, Inst Astrophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany
[6] CSIC, Inst Ciencies Espai ICE, Campus UAB C-Can Magrans S-N, Bellaterra 08193, Barcelona, Spain
[7] Inst Estudis Espacials Catalunya IEEC, C Gran Capita 2-4, Barcelona 08034, Spain
[8] SETI Inst, Mountain View, CA 94043 USA
[9] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA
[10] Univ Space Res Assoc, Res Inst Adv Comp Sci, Washington, DC 20024 USA
[11] Ctr Astrobiol CS INTA, ESAC campus, Villanueva De La Canada 28692, Madrid, Spain
[12] Inst Astrofis Andalucia IAA CSIC, Glorieta Astron S-N, Granada 18008, Spain
[13] Inst Astrofis Canarias IAC, San Cristobal la Laguna 38205, Tenerife, Spain
[14] Univ La Laguna ULL, Dept Astrofis, San Cristobal la Laguna 38206, Tenerife, Spain
[15] Observ Calar Alto, Ctr Astronon Hispano Andalucia, Gergal 04550, Almeria, Spain
[16] Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany
[17] Univ Complutense Madrid, Dept Fis Tierra & Astrofis, Madrid 28040, Spain
[18] Univ Complutense Madrid, Fac Ciencias Fis, IPARCOS UCM, Inst Fis Particulas & Cosmos UCM, Madrid 28040, Spain
[19] Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany
来源：
ASTRONOMY & ASTROPHYSICS | 2024年 / 688卷
基金：
美国国家科学基金会;
关键词：
planetary systems; planets and satellites: dynamical evolution and stability; stars: low-mass; LOMB-SCARGLE PERIODOGRAM; M-CIRCLE-PLUS; RADIAL-VELOCITIES; CHROMOSPHERIC ACTIVITY; HABITABLE ZONE; INPUT CATALOG; HARPS SEARCH; SUPER-EARTH; PLANET; STARS;
D O I：
10.1051/0004-6361/202449375
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Context. GJ 581 is a nearby M dwarf known to host a packed multiple planet system composed of two super-Earths and a Neptune-mass planet. We present new orbital analyses of the GJ 581 system, utilizing recent radial velocity (RV) data obtained from the CARMENES spectrograph combined with newly reprocessed archival data from the HARPS and HIRES spectrographs. Aims. Our aim was to analyze the post-discovery spectroscopic data of GJ581, which were obtained with CARMENES. In addition, we used publicly available HIRES and HARPS spectroscopic data to seek evidence of the known and disputed exoplanets in this system. We aimed to investigate the stellar activity of GJ 581 and update the planetary system's orbital parameters using state-of-the-art numerical models and techniques. Methods. We performed a periodogram analysis of the available precise CARMENES, HIRES, and HARPS RVs and of stellar activity indicators. We conducted detailed orbital analyses by testing various orbital configurations consistent with the RV data. We studied the posterior probability distribution of the parameters fit to the data and we explored the long-term stability and overall orbital dynamics of the GJ 581 system. Results. We refined the orbital parameters of the GJ 581 system using the most precise and complete set of Doppler data available. Consistent with the existing literature, our analysis confirms that the system is unequivocally composed of only three planets detectable in the present data, dismissing the putative planet GJ 581 d as an artifact of stellar activity. Our N-body fit reveals that the system's inclination is i = 47.0(-13.0)(+14.6) deg, which implies that the planets could be up to 30% more massive than their previously reported minimum masses. Furthermore, we report that the GJ 581 system exhibits long-term stability, as indicated by the posterior probability distribution, characterized by secular dynamical interactions without the involvement of mean motion resonances.
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页数：21
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