A new analysis of the GJ581 extrasolar planetary system

Abstract

We have done a new analysis of the available observations for the GJ581 exoplanetary system. Today this system is controversial due to choices that can be done in the orbital determination. The main ones are the ocurrence of aliases and the additional bodies - the planets f and g - announced in Vogt et al. 2010. Any dynamical study of exoplanets requires the good knowledge of the orbital elements and the investigations involving the planet g are particularly interesting, since this body would lie in the Habitable Zone (HZ) of the star GJ581. This region,for this system, is very attractive of the dynamical point of view due to several resonances of two and three bodies present there. In this work, we investigate the conditions under which the planet g may exist. We stress the fact that the planet g is intimately related with the orbital elements of the planet d; more precisely, we conclude that it is not possible to disconnect its existence from the determination of the eccentricity of the planet d. Concerning the planet f, we have found one solution with period $\approx 450$ days, but we are judicious about any affirmation concernig this body because its signal is in the threshold of detection and the high period is in a spectral region where the ocorruence of aliases is very common. Besides, we outline some dynamical features of the habitable zone with the dynamical map and point out the role played by some resonances laying there.

12 pages, 9 figures

References in corpus (13)

• The HARPS search for southern extra-solar planets XVIII. An Earth-mass planet in the GJ 581 planetary system
• Radial velocity planets de-aliased. A new, short period for Super-Earth 55 Cnc e
• The HARPS search for southern extra-solar planets. VI. A Neptune-mass planet around the nearby M dwarf Gl 581
• The Lick-Carnegie Exoplanet Survey: A 3.1 M_Earth Planet in the Habitable Zone of the Nearby M3V Star Gliese 581
• How eccentric orbital solutions can hide planetary systems in 2:1 resonant orbits
• Astrophysical Parameters and Habitable Zone of the Exoplanet Hosting Star GJ 581
• The orbits of the extrasolar planets HD 82943 c,b
• Tidal interactions in multi-planet systems
• Model Spectra of the First Potentially Habitable Super-Earth - Gl581d
• On planetary mass determination in the case of super-Earths orbiting active stars. The case of the CoRoT-7 system
• Spectroscopic characterization of the atmospheres of potentially habitable planets: GL 581 d as a model case study
• Chirikov Diffusion in the Asteroidal Three-Body Resonance (5,-2,-2)
• Detectability and Error Estimation in Orbital Fits

Cited by in corpus (11)

• Stellar Activity Masquerading as Planets in the Habitable Zone of the M dwarf Gliese 581
• The TRENDS High-Contrast Imaging Survey. IV. The Occurrence Rate of Giant Planets around M-Dwarfs
• The impact of red noise in radial velocity planet searches: Only three planets orbiting GJ581?
• GJ 832c: A super-earth in the habitable zone
• Tidal synchronization of close-in satellites and exoplanets. II. Spin dynamics and extension to Mercury and exoplanets host stars
• Formation and evolution of the two 4/3 resonant giants planets in HD 200946
• Dynamics of Rotation of Super-Earths
• Dynamical instabilities in systems of multiple short-period planets are likely driven by secular chaos: a case study of Kepler-102
• An investigation into the radial velocity variability of GJ 581 - On the significance of GJ 581g
• Dynamics of the 3/1 planetary mean-motion resonance. An application to the HD60532 b-c planetary system
• Dynamical stability of the Gliese 581 exoplanetary system