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A dynamically-packed planetary system around GJ 667C with three super-Earths in its habitable zone

Anglada-Escudé, Guillem ; Tuomi, Mikko ; Gerlach, Enrico ; Barnes, Rory ; Heller, René ; Jenkins, James S. ; Wende, Sebastian ; Vogt, Steven S. ; Paul Butler, R. ; Reiners, Ansgar ; Jones, Hugh R. A.

Astronomy and astrophysics (Berlin), 2013-08, Vol.556, p.np-np [Periódico revisado por pares]

EDP Sciences

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  • Título:
    A dynamically-packed planetary system around GJ 667C with three super-Earths in its habitable zone
  • Autor: Anglada-Escudé, Guillem ; Tuomi, Mikko ; Gerlach, Enrico ; Barnes, Rory ; Heller, René ; Jenkins, James S. ; Wende, Sebastian ; Vogt, Steven S. ; Paul Butler, R. ; Reiners, Ansgar ; Jones, Hugh R. A.
  • Assuntos: astrobiology ; Doppler ; Doppler effect ; Dynamical systems ; Luminosity ; methods: data analysis ; Planetary systems ; Planets ; planets and satellites: dynamical evolution and stability ; Solar system ; stars: individual: GJ 667C ; techniques: radial velocities ; Water
  • É parte de: Astronomy and astrophysics (Berlin), 2013-08, Vol.556, p.np-np
  • Notas: publisher-ID:aa21331-13
    bibcode:2013A%26A...556A.126A
    istex:ACDC069AF17C9B8FB4EF1A84C125FC14D1A20D49
    ark:/67375/80W-9QZPFFTG-8
    dkey:10.1051/0004-6361/201321331
    e-mail: guillem.anglada@gmail.com
    Based on data obtained from the ESO Science Archive Facility under request number ANGLADA36104. Such data had been previously obtained with the HARPS instrument on the ESO 3.6 m telescope under the programs 183.C-0437, 072.C-0488 and 088.C-0662, and with the UVES spectrograph at the Very Large Telescopes under the program 087.D-0069. This study also contains observations obtained at the W.M. Keck Observatory – which is operated jointly by the University of California and the California Institute of Technology – and observations obtained with the Magellan Telescopes, operated by the Carnegie Institution, Harvard University, University of Michigan, University of Arizona, and the Massachusetts Institute of Technology.
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Context. Since low-mass stars have low luminosities, orbits at which liquid water can exist on Earth-sized planets are relatively close-in, which produces Doppler signals that are detectable using state-of-the-art Doppler spectroscopy. Aims. GJ 667C is already known to be orbited by two super-Earth candidates. We have recently applied developed data analysis methods to investigate whether the data supports the presence of additional companions. Methods. We obtain new Doppler measurements from HARPS extracted spectra and combined them with those obtained from the PFS and HIRES spectrographs. We used Bayesian and periodogram-based methods to re-assess the number of candidates and evaluated the confidence of each detection. Among other tests, we validated the planet candidates by analyzing correlations of each Doppler signal with measurements of several activity indices and investigated the possible quasi-periodic nature of signals. Results. Doppler measurements of GJ 667C are described better by six (even seven) Keplerian-like signals: the two known candidates (b and c); three additional few-Earth mass candidates with periods of 92, 62, and 39 days (d, e and f); a cold super-Earth in a 260-day orbit (g) and tantalizing evidence of a ~1 M⊕ object in a close-in orbit of 17 days (h). We explore whether long-term stable orbits are compatible with the data by integrating 8 × 104 solutions derived from the Bayesian samplings. We assess their stability using secular frequency analysis. Conclusions. The system consisting of six planets is compatible with dynamically stable configurations. As for the solar system, the most stable solutions do not contain mean-motion resonances and are described well by analytic Laplace-Lagrange solutions. Preliminary analysis also indicates that masses of the planets cannot be higher than twice the minimum masses obtained from Doppler measurements. The presence of a seventh planet (h) is supported by the fact that it appears squarely centered on the only island of stability left in the six-planet solution. Habitability assessments accounting for the stellar flux, as well as tidal dissipation effects, indicate that three (maybe four) planets are potentially habitable. Doppler and space-based transit surveys indicate that 1) dynamically packed systems of super-Earths are relatively abundant and 2) M-dwarfs have more small planets than earlier-type stars. These two trends together suggest that GJ 667C is one of the first members of an emerging population of M-stars with multiple low-mass planets in their habitable zones.
  • Editor: EDP Sciences
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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