The formation of the Oort cloud in open cluster environments

  title={The formation of the Oort cloud in open cluster environments},
  author={Nathan A. Kaib and Thomas R. Quinn},
We study the influence of an open cluster environment on the formation and current structure of the Oort cloud. To do this, we have run 19 different simulations of the formation of the Oort cloud for 4.5 Gyrs. In each simulation, the Solar System spends its first 100 Myrs in a different open cluster environment before transitioning to its current field environment. We find that, compared to forming in the field environment, the inner Oort cloud is preferentially loaded with comets while the Sun… 
Reassessing the formation of the inner Oort cloud in an embedded star cluster
We re-examine the formation of the inner Oort comet cloud while the Sun was in its birth cluster with the aid of numerical simulations. This work is a continuation of an earlier study (Brasser, R.,
Notes on the outer-Oort-cloud formation efficiency in the simulation of Oort cloud formation
Aims. The formation efficiency of the outer Oort cloud, obtained in the simulation performed in our previous work, appeared to be very low in a comparison with the corresponding results of other
The Destruction of an Oort Cloud in a rich stellar cluster
It is possible that the formation of the Oort Cloud dates back to the earliest epochs of solar system history. At that time, the Sun was almost certainly a member of the stellar cluster, where it was
Oort cloud formation at various Galactic distances
In this study we present the results from numerical simulations of the formation of the Oort comet cloud where we positioned the Sun in various parts of the disc of the Galaxy, starting at 2 kpc up
Stability in the most external region of the Oort Cloud: evolution of the ejected comets
In this paper, we present a study of the dynamical effects of the Galaxy on the external region of the Oort Cloud. The aims of this paper are: (i) to determine an outer limit for the Oort Cloud; and
We study the influence of outer solar system architecture on the structural evolution of the Oort Cloud (OC) and the flux of Earth-crossing comets. In particular, we seek to quantify the role of the
Galactic environment and cometary flux from the Oort cloud
  • M. Fouchard
  • Physics
    Proceedings of the International Astronomical Union
  • 2009
Abstract The Oort cloud, which corresponds to the furthest boundary of our Solar System, is considered as the main reservoir of long period comets. This cloud is likely a residual of the Solar System
Replenishment of the comet Oort Cloud during the outward migration of Uranus and Neptune
Abstract In the past, the formation process of the distant comet Oort Cloud was simulated assuming the ejecting giant planets in their current orbits and with their current masses. Today, it is
On the present shape of the Oort cloud and the flux of “new” comets
Abstract Long term evolution of an initial set of 107 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
Oort cloud asteroids: collisional evolution, the Nice Model, and the Grand Tack
If the Solar system had a history of planet migration, the signature of that migration may be imprinted on the populations of asteroids and comets that were scattered in the planets' wake. Here, we


The Formation of the Oort Cloud and the Primitive Galactic Environment
We analyze the conditions of formation of the Oort cloud from icy planetesimals scattered by the accreting outer planets. The combined effect of planetary and external perturbations is considered to
Embedded star clusters and the formation of the Oort Cloud
Abstract Observations suggest most stars originate in clusters embedded in giant molecular clouds [Lada, C.J., Lada, E.A., 2003. Annu. Rev. Astron. Astrophys. 41, 57–115]. Our Solar System likely
The Origin of Halley-Type Comets: Probing the Inner Oort Cloud
We have integrated the orbits of 27,700 test particles initially entering the planetary system from the Oort cloud in order to study the origin of Halley-type comets (HTCs). We included the
Rapid collisional evolution of comets during the formation of the Oort cloud
It appears that collisions will prevent most comets escaping from most locations in the region of the giant planets until the disk mass there declines sufficiently that the dynamical ejection timescale is shorter than the collisional lifetime.
A model of the galactic tidal interaction with the Oort comet cloud
We consider a model of the in situ Oort cloud which is isotropic with a random distrihution of perihelia directions and angular momenta. The energy distribution adopted has a continuous range of
Oort Cloud Formation and Dynamics
The Oort cloud is the primary source of the “nearly isotropic” comets, which include new and returning long-period comets and Halley-type comets. We focus on the following topics: (1) the orbital
The Formation and Extent of the Solar System Comet Cloud
The formation of the solar system comet cloud and its subsequent evolution over an interval equal to the age of the solar system are simulated. Assuming that the comets formed in the outer planetary
An analytical method to compute comet cloud formation efficiency and its application
A quick analytical method is presented for calculating comet cloud formation efficiency in the case of a single planet or multiple-planet system for planets that are not too eccentric (ep ≲ 0.3). A
Discovery of a Candidate Inner Oort Cloud Planetoid
We report the discovery of the minor planet (90377) Sedna, the most distant object ever seen in the solar system. Prediscovery images from 2001, 2002, and 2003 have allowed us to refine the orbit
The Buildup of a Tightly Bound Comet Cloud around an Early Sun Immersed in a Dense Galactic Environment: Numerical Experiments
We simulate numerically the buildup of a comet reservoir around the early Sun assumed to be still immersed in the placental molecular gas that gave birth to it, and to be gravitationally bound to