scholarly journals Two fast integrators for the Galactic tide effects in the Oort Cloud

2007 ◽  
Vol 377 (3) ◽  
pp. 1151-1162 ◽  
Author(s):  
S. Breiter ◽  
M. Fouchard ◽  
R. Ratajczak ◽  
W. Borczyk
Keyword(s):  
Oort Cloud ◽  
Galactic Tide

scholarly journals Methods for the Study of the Dynamics of the Oort Cloud Comets II: Modelling the Galactic Tide

2007 ◽  
pp. 273-296 ◽  
Author(s):  
Marc Fouchard ◽  
Christiane Froeschlé ◽  
Sławomir Breiter ◽  
Roman Ratajczak ◽  
Giovanni B. Valsecchi ◽  
...  
Keyword(s):  
Oort Cloud ◽  
Galactic Tide

scholarly journals Anisotropy of long-period comets explained by their formation process

2020 ◽  
Author(s):  
Arika Higuchi
Keyword(s):  
Analytical Solutions ◽  
Formation Process ◽  
Ecliptic Plane ◽  
Radial Component ◽  
Orbital Evolution ◽  
Oort Cloud ◽  
Long Period ◽  
Numerical Integrations ◽  
Galactic Tide ◽  
Galactic Longitude

<p>Long-period comets coming from the Oort cloud are thought to be<span class="Apple-converted-space"> </span>planetesimals formed in the planetary region on the ecliptic plane.<span class="Apple-converted-space"> </span>We have investigated the orbital evolution of these bodies<span class="Apple-converted-space"> </span>due to the Galactic tide.<span class="Apple-converted-space"> </span>We extended Higuchi et al. (2007) and derived the<span class="Apple-converted-space"> </span>analytical solutions to the Galactic longitude and latitude of<span class="Apple-converted-space"> </span>the direction of aphelion, <em>L</em> and <em>B</em>.<span class="Apple-converted-space"> </span>Using the analytical solutions,<span class="Apple-converted-space"> </span>we show that the ratio of the periods of the evolution of <em>L</em> and <em>B</em> is very close to either 2 or ∞ for initial eccentricities <em>e</em><sub>i</sub>∼1,<span class="Apple-converted-space"> </span>as is true for the Oort cloud comets.<span class="Apple-converted-space"> </span>From the relation between <em>L</em> and <em>B</em>, we predict that Oort cloud comets returning to the planetary region concentrate on the ecliptic plane<span class="Apple-converted-space"> </span>and a second plane, which we call the "empty ecliptic".<span class="Apple-converted-space"> </span>This consists in a rotation of 180<sup>°</sup> of the ecliptic around the Galactic pole. Our numerical integrations confirm that the radial component of the Galactic tide, which is neglected in the derivation of the analytical solutions,<span class="Apple-converted-space"> </span>is not strong enough to break the relation between <em>L</em> and <em>B</em> derived analytically. Brief examination of observational data shows<span class="Apple-converted-space"> </span>that there are concentrations near both the ecliptic and the empty ecliptic. We also show that the anomalies of the distribution of <em>B</em> of long-period comets mentioned by several authors are explained by the concentrations on the two planes more consistently than the previous explanation.</p>

scholarly journals Stability in the most external region of the Oort Cloud: evolution of the ejected comets

2019 ◽  
Vol 490 (2) ◽  
pp. 2495-2506
Author(s):  
J A Correa-Otto ◽  
M F Calandra
Keyword(s):  
Binary Stars ◽  
Outer Boundary ◽  
Oort Cloud ◽  
Dynamical Behaviour ◽  
Dynamical Structure ◽  
Wide Binary ◽  
External Region ◽  
Test Particles ◽  
The Galaxy ◽  
Galactic Tide

ABSTRACTIn 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 (ii) to analyse the dynamical behaviour of the most external objects of the Oort Cloud and how they are ejected from the Solar system. To achieve these aims, we follow the temporal evolution of massless test particles in the Galactic environment of the solar neighbourhood. We show that the effect of the perturbations from the Galactic tide in the particles is similar to that found for the evolution of the population of wide binary stars. Moreover, in the Oort Cloud, we find a dynamical structure around 105 au conformed by objects unbound from the Sun. This structure allows us to define a transition region of stability and an outer boundary for the Oort Cloud, and it is also in agreement with previous results about the disruption of wide binary stars.

Periodic Modulation of the Oort Cloud Comet Flux by the Adiabatically Changing Galactic Tide

Icarus ◽  
1995 ◽  
Vol 116 (2) ◽  
pp. 255-268 ◽  
Author(s):  
John J. Matese ◽  
Patrick G. Whitman ◽  
Kimmo A. Innanen ◽  
Mauri J. Valtonen
Keyword(s):  
Oort Cloud ◽  
Periodic Modulation ◽  
Galactic Tide

Dynamics of comets in the collapsing protosolar nebula

1999 ◽  
Vol 173 ◽  
pp. 45-50
Author(s):  
L. Neslušan
Keyword(s):  
Solar System ◽  
Velocity Distribution ◽  
Oort Cloud ◽  
Interstellar Clouds ◽  
Protosolar Nebula ◽  
Moving Bodies

AbstractComets are created in the cool, dense regions of interstellar clouds. These macroscopic bodies take place in the collapse of protostar cloud as mechanically moving bodies in contrast to the gas and miscroscopic dust holding the laws of hydrodynamics. In the presented contribution, there is given an evidence concerning the Solar system comets: if the velocity distribution of comets before the collapse was similar to that in the Oort cloud at the present, then the comets remained at large cloud-centric distances. Hence, the comets in the solar Oort cloud represent a relict of the nebular stage of the Solar system.

From the Oort cloud to Halley-type comets

1999 ◽  
Vol 173 ◽  
pp. 327-338 ◽  
Author(s):  
J.A. Fernández ◽  
T. Gallardo
Keyword(s):  
Total Population ◽  
Complex Function ◽  
Dynamical Evolution ◽  
Oort Cloud ◽  
Capture Process ◽  
Influx Rate ◽  
Short Period ◽  
Dynamical Properties ◽  
Orbital Periods ◽  
Probability Of Capture

AbstractThe Oort cloud probably is the source of Halley-type (HT) comets and perhaps of some Jupiter-family (JF) comets. The process of capture of Oort cloud comets into HT comets by planetary perturbations and its efficiency are very important problems in comet ary dynamics. A small fraction of comets coming from the Oort cloud − of about 10−2− are found to become HT comets (orbital periods < 200 yr). The steady-state population of HT comets is a complex function of the influx rate of new comets, the probability of capture and their physical lifetimes. From the discovery rate of active HT comets, their total population can be estimated to be of a few hundreds for perihelion distancesq <2 AU. Randomly-oriented LP comets captured into short-period orbits (orbital periods < 20 yr) show dynamical properties that do not match the observed properties of JF comets, in particular the distribution of their orbital inclinations, so Oort cloud comets can be ruled out as a suitable source for most JF comets. The scope of this presentation is to review the capture process of new comets into HT and short-period orbits, including the possibility that some of them may become sungrazers during their dynamical evolution.

Stellar Encounters with the Oort Cloud Based on [ITAL]Hipparcos[/ITAL] Data

1999 ◽  
Vol 117 (2) ◽  
pp. 1042-1055 ◽  
Author(s):  
Joan García-Sánchez ◽  
Robert A. Preston ◽  
Dayton L. Jones ◽  
Paul R. Weissman ◽  
Jean-François Lestrade ◽  
...  
Keyword(s):  
Oort Cloud
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