Abstract
We have done a new analysis of the available observations of 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 occurrence of aliases and the additional bodies—the planets f and g—announced in Vogt et al. (Astrophys J 723:954–965, 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 ≈450 days, but we are judicious about any affirmation concerning this body because its signal is in the threshold of detection and the high period is in a spectral region where the occurrence of aliases is very common. Besides, we outline some dynamical features of the HZ with the dynamical map and point out the role played by some resonances laying there.
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References
Anglada-Escudé, G., Dawson, R.I.: Aliases of the first eccentric harmonic: is GJ581 g a genuine planet candidate? arXiv: 1011.0186 (2010)
Anglada-Escudé G., Lopez-Morales M., Chambers J.E.: How eccentric orbital solution can hide planetary systems in 2:1 resonant orbits. Astrophys. J. 709, 168–178 (2009)
Beaugé C., Giuppone C.A., Ferraz-Mello S., Michtchenko T.A.: Reliability of the orbital fits for resonant extrasolar planetary system: the case of HD82043. MNRAS 385, 2151–2160 (2008)
Bonfils X., Forveille T., Delfosse X., Udry S., Mayor M. et al.: The HARPS search for Southern extra-solar planets VI. A Neptune-mass planet around the nearby M dwarf GL581. Astron. Astrophys. 343, L15–L18 (2005)
Cachucho F., Cincotta P.M., Ferraz-Mello S.: Chirikov diffusion in the asteroidal three-body resonance (5,−2,−2). Celest. Mech. Dyn. Astron. 108, 35–58 (2010)
Charbonneau P.: Genetic algorithms in astronomy and astrophysics. Astrophys. J. Suppl. Ser. 101, 309–334 (1995)
Charbonneau, P.: An introduction to genetic algorithms to numerical optimization. In: High Altitude Observatory-National Center for Atmospheric Research. Boulder, Colorado, March 2002. Available in: http://www.cs.uga.edu/~plotter/compIntell/no_tutorial.pdf
Dawson R.I., Fabrycky D.C.: Radial velocity planets de-aliased: a new, short period search for super-Earth 55Cnc e. Astrophys. J. 722, 9327–9953 (2010)
Ferraz-Mello S.: Estimation of periods from unequally spaced observations. Astron. J. 86, 619 (1981)
Ferraz-Mello S., Michtchenko T.A., Beaugé C.: The orbits of the extra solar planets HD82943 c and b. Astrophys. J. 621, 473–481 (2005a)
Ferraz-Mello, S., Michtchenko, T.A., Beaugé, C., Callegari, N.: Extrasolar planetary systems. In: Dvorak, R., Freistetter, F., Kurths, J. (eds.) Chaos and Stability in Planetary Systems, Lecture Notes in Physics, vol. 653, pp. 219–271 (2005b)
Ferraz-Mello S., Tadeu dos Santos M., Beaugé C., Michtchenko T.A., Rodriguez A.: On the mass determination of super-Earths orbiting active stars: the CoRoT 7 system. Astron. Astrophys. 531, A161 (2011)
Forveille, T., Bonfils, X., Delfosse, X., Alonso, R., Udry, S. et al.: The HARPS search for Southern extra-solar planets XXXII. Only 4 planets in GL581, arXiv: 1109.2505 (2011)
Giuppone C.A., Tadeu dos Santos M., Beaugé C., Ferraz-Mello S., Michtchenko T.A.: Detectability and error estimation in orbital fits of resonant extrasolar planets. Astrophys. J. 699, 1321–1332 (2009)
Kaltenegger L., Segura A., Mohanty S.: Model spectra of the first potentially habitable super-Earth GL581d. Astrophys. J. 733, id35 (2011)
Mayor M., Bonfils X., Forveille T., Delfosse X., Udry S. et al.: The HARPS search for southern extra-solar planets XVIII. An earth-mass planet in the GJ581 planetary system. A&A 507, 487–494 (2009)
Michtchenko T.A., Ferraz-Mello S.: Resonant Structure of the Outer Solar System in the Neighborhood of the Planets. Astron. J. 122, 474–481 (2001)
Michtchenko T.A., Lazzaro D., Ferraz-Mello S., Roig F.: Origin of the Basaltic Asteroid 1459 Magnya: A Dynamical and Mineralogical Study of the Outer Main Belt. Icarus. 158, 343–359 (2002)
Papaloizou J.C.B.: Tidan interactions in multi-planet systems. Celest. Mech. Dyn. Astron. 111, 83–103 (2011)
Press W.H., Teukolsky S.A., Vetterling W.T., Flannery B.P.: Fortran Numerical Recipes. Cambridge University Press, Cambridge (1992)
Roberts D.H., Lehar J., Dretter J.W.: Times Series Analysis with clean—part one-derivation of a spectrum. Astron. J. 93, 968 (1987)
Schneider, J.: The extrasolar planets encyclopaedia. http://exoplanet.eu/ (2001)
Udry S., Bonfils X., Delfosse X., Forveille T., Mayor M. et al.: The HARPS search for Southern extra-solar planets XI. Super-earths (5 and 8 M E in 3-planet system. Astron. Astrophys. 469, L43–L47 (2007)
VizieR data base: http://vizier.u-strasbg.fr/
Vogt S.S., Butler R.P, Rivera E.J., Haghighipour N., Hnery G.W., Williamson M.H.: The Lick-Carnegie exoplanet survey: a 3.1 MT planet in the habitable zone of the nearby M3v star Gliese 581. Astrophys. J. 723, 954–965 (2010)
von Braun K., Boyajian T.S., Kane S.R., van Belle G.T., Ciardi D.R. et al.: Astrophysical parameters and habitable zone of the exoplanet hosting star GJ581. ApJ 729, L26 (2011)
Von Paris P., Cabrera J., Godoit M., Grenfell J.L., Hedelt P. et al.: Spectroscopic characterization of the atmospheres of potentially habitable planets: GL581d, as a mode case study. A&A 534, A26 (2011)
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Tadeu dos Santos, M., Silva, G.G., Ferraz-Mello, S. et al. A new analysis of the GJ581 extrasolar planetary system. Celest Mech Dyn Astr 113, 49–62 (2012). https://doi.org/10.1007/s10569-012-9407-1
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DOI: https://doi.org/10.1007/s10569-012-9407-1