Planète extragalactique

Une planète extragalactique (en anglais : extragalactic planet) est une planète extrasolaire n'appartenant pas à la Voie lactée (notre galaxie). En raison des immenses distances considérées, leur détection s'avère extrêmement difficile.

Planètes candidates

PA-99-N2 b

PA-99-N2 b[1] est une éventuelle planète extragalactique en orbite autour de l'étoile PA-99-N2 dans la galaxie d'Andromède.

Sa découverte a été annoncée en 2009[2].

La masse de PA-99-N2 b est estimée à 6,34 masses joviennes.

Elle a été découverte en utilisant une microlentille gravitationnelle qui a détecté une exoplanète dans la Galaxie d'Andromède, galaxie non satellite la plus proche de nous. L'optique a révélé une planète de 6 ou 7 fois la masse de Jupiter[3]. Ce fut la première annonce pour cette galaxie[4].

Q0957+561 b

Q0957+561 b, est une éventuelle planète extragalactique en orbite autour du Quasar Jumeau Q0957+561.

L'exoplanète est à environ 4 millions d'années-lumière de la Terre. On sait peu de choses sur cette exoplanète[5],[6].

Références

  1. (en) « Planet PA-99-N2 b » [html], sur The Extrasolar Planets Encyclopaedia
  2. (en) Gabriele Ingrosso et al., « Pixel lensing as a way to detect extrasolar planets in M31 », Monthly Notices of the Royal Astronomical Society, vol. 399, no 1,‎ , p. 219-228 (DOI 10.1111/j.1365-2966.2009.15184.x, Bibcode 2009MNRAS.399..219I, arXiv 0906.1050, lire en ligne, consulté le )
    Les coauteurs de l'article sont, outre Gabriele Ingrosso, S. Calchi Novati, F. De Paolis, Ph. Jetzer, A. A. Nucita et A. F. Zakharov. Il a été accepté le et mis en ligne, sur arXiv, le .
  3. Thaindian News, First extragalactic exoplanet may have been found by gravitational microlensing, 11 June 2009
  4. New Scientist, First extragalactic exoplanet may have been found, 10 June 2009
  5. New Scientist (issue 2037), Do alien worlds throng faraway galaxy? Govert Schilling 06 July 1996
  6. Extrasolar Visions, "The Q0957+561 Planet" (accessed 1 September 2009)

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