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General >> Discussion >> 55 Cancri: binary affecting planet orbits?
http://www.orbitsimulator.com/cgi-bin/yabb/YaBB.pl?num=1319828376

Message started by EDG on 10/28/11 at 11:59:36

Title: 55 Cancri: binary affecting planet orbits?
Post by EDG on 10/28/11 at 11:59:36

55 Cancri: A Coplanar Planetary System that is Likely Misaligned with its Star

http://arxiv.org/abs/1110.5911

Apparently the binary companion is tilting all the orbits of the known planets, as if they were a single body. Is gravsim able to simulate this? (it's not Kozai, apparently)

Title: Re: 55 Cancri: binary affecting planet orbits?
Post by Tony on 10/29/11 at 13:07:15

Here's a link to the Cancri55 simulation
http://www.orbitsimulator.com/cgi-bin/yabb/YaBB.pl?num=1194407194/7#7

You can always add the binary companion, out-of-plane, to this system and see what happens.  The difficulty you'll have is that you have to run the simulation very slowly since planet E is so close.  So the binary companion will move very slowly.  It will take a long time to simulate any significant amount of time.

Title: Re: 55 Cancri: binary affecting planet orbits?
Post by frankuitaalst on 10/30/11 at 12:07:48


Tony wrote:
Here's a link to the Cancri55 simulation
http://www.orbitsimulator.com/cgi-bin/yabb/YaBB.pl?num=1194407194/7#7

You can always add the binary companion, out-of-plane, to this system and see what happens. The difficulty you'll have is that you have to run the simulation very slowly since planet E is so close. So the binary companion will move very slowly. It will take a long time to simulate any significant amount of time.


I really have some difficulty understanding the applied method in  this paper . The role of the binary at >1000 Au is rather vague . Further the  key feature of he paper is the proposed inclination of the primary star rotation axis and the plane of the planets which is estimated to be around 50.
I think it is not possible to account for the stars rotation axis in GravSim ( which can give tidal influence upon the plantes orbits ) .
One method for compensating this in Gravsim could be treating the primary star is a very very close binary , which surely introduces tidal effects on the orbits as well as precession .

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