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On the present shape of the Oort cloud and the flux of "new" comets
Univ Lille, UPMC Univ Paris 06, Sorbonne Univ, PSL Res Univ,LAL IMCCE,Observ Paris,CNRS, 1 Impasse Observ, F-59000 Lille, France..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy. PAS Space Res Ctr, Bartycka 18A, PL-00716 Warsaw, Poland..
Observ Cote Azur, UMR 7293, Blvd Observ,BP 4229, F-06304 Nice 4, France..
IAPS INAF, Via Fosso Cavaliere 100, I-00133 Rome, Italy.;IFAC CNR, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, FI, Italy..
2017 (English)In: Icarus (New York, N.Y. 1962), ISSN 0019-1035, E-ISSN 1090-2643, Vol. 292, 218-233 p.Article in journal (Refereed) Published
Abstract [en]

Long term evolution of an initial set of 10(7) Oort cloud comets is performed for the age of the solar system taking into account the action of passing stars using 10 different sequences of stellar encounters, Galactic tides and the gravity of the giant planets. The initial conditions refer to a disk-shaped Oort cloud precursor, concentrated toward the ecliptic with perihelia in the region of Uranus and Neptune. Our results show that the shape of the Oort cloud quickly reach a kind of steady state beyond a semi-major axis greater than about 2000 AU (this threshold depending on the evolution time-span), with a Boltzmann distribution of the orbital energy. The stars act in an opposite way to what was found in previous papers, that is they emptied an initial Tidal Active Zone that is overfilled with respect to the isotropic case. Consequently, the inclusion of stellar perturbations strongly affect the shape of the Oort spike. On the contrary, the Oort spike shape appears to be poorly dependent on the stellar sequences used, whereas the total flux of observable comets and the proportion of retrograde comets for the inner part of the spike are significantly dependent of it. Then it has been highlighted that the total flux, the shape of the Oort spike and the shape of the final Oort cloud are almost independent of the initial distribution of orbital energy considered.

Place, publisher, year, edition, pages
2017. Vol. 292, 218-233 p.
Keyword [en]
Oort cloud, Dynamics, Comets, Formation of the solar system
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-323749DOI: 10.1016/j.icarus.2017.01.013ISI: 000401053200017OAI: oai:DiVA.org:uu-323749DiVA: diva2:1108878
Available from: 2017-06-13 Created: 2017-06-13 Last updated: 2017-06-13Bibliographically approved

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