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Dynamics of the Oort Cloud In the Gaia Era I: Close Encounters

Published online by Cambridge University Press:  07 March 2018

S. Torres ,
S. Portegies Zwart  and
A. G. A. Brown
S. Torres
Affiliation:
Leiden Observatory, Leiden University, PO Box 9513 Leiden, NL.2300 RA, the Netherlands. email: [email protected], [email protected] & [email protected]
S. Portegies Zwart
Affiliation:
Leiden Observatory, Leiden University, PO Box 9513 Leiden, NL.2300 RA, the Netherlands. email: [email protected], [email protected] & [email protected]
A. G. A. Brown
Affiliation:
Leiden Observatory, Leiden University, PO Box 9513 Leiden, NL.2300 RA, the Netherlands. email: [email protected], [email protected] & [email protected]
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Abstract

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Comets in the Oort cloud evolve under the influence of internal and external perturbations from giant planets to stellar passages, the Galactic tides, and the interstellar medium.Using the positions, parallaxes and proper motions from TGAS in Gaia DR1 and combining them with the radial velocities from the RAVE-DR5, Geneva-Copenhagen and Pulkovo catalogues, we calculated the closest encounters the Sun has had with other stars in the recent past and will have in the near future. We find that the stars with high proper motions near to the present time are missing in the Gaia-TGAS, and those to tend to be the closest ones. The quality of the data allows putting better constraints on the encounter parameters, compared to previous surveys.

Keywords

Oort cloudSolar System
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S330: Astrometry and Astrophysics in the Gaia sky , April 2017 , pp. 269 - 270
Copyright
Copyright © International Astronomical Union 2018 

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