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55 Cancri: binary affecting planet orbits? (Read 1908 times)
EDG
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55 Cancri: binary affecting planet orbits?
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)
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Tony
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Re: 55 Cancri: binary affecting planet orbits?
Reply #1 - 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.
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frankuitaalst
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Re: 55 Cancri: binary affecting planet orbits?
Reply #2 - 10/30/11 at 12:07:48
 
Quote from 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.

 
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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