24 Sex and HD 200964 - Multi-planet systems in resonance

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Re: 24 Sex and HD 200964 - Multi-planet systems in resonance

Post by Sirius_Alpha on 27th July 2010, 8:18 pm

The first two are extremely interesting systems. 24 Sex having two planets in a 1:2 resonance, and HD 200964 having two planets in a probable 4:3 resonance.

The third, HD 102956 seems to be a hot Jupiter around a subgiant.

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Re: 24 Sex and HD 200964 - Multi-planet systems in resonance

Post by Sirius_Alpha on 27th July 2010, 8:39 pm

HD 200964


24 Sex


Last edited by Sirius_Alpha on 27th July 2010, 8:40 pm; edited 1 time in total (Reason for editing : Switched image labels.)

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Re: 24 Sex and HD 200964 - Multi-planet systems in resonance

Post by Lazarus on 28th July 2010, 1:32 pm

Apparently no-one knows their Latin any more, it should be Sextantis not Sextanis.

Would be interesting to have an orbital evolution animation of those, particularly the 4:3 configuration as this has not been observed yet in extrasolar planetary systems.
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Re: 24 Sex and HD 200964 - Multi-planet systems in resonance

Post by Sirius_Alpha on 28th July 2010, 5:09 pm

Lazarus wrote:Apparently no-one knows their Latin any more, it should be Sextantis not Sextanis.


Yeah I was wondering about that....

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Re: 24 Sex and HD 200964 - Multi-planet systems in resonance

Post by Edasich on 29th July 2010, 4:37 am

Lazarus wrote:Apparently no-one knows their Latin any more, it should be Sextantis not Sextanis.

Would be interesting to have an orbital evolution animation of those, particularly the 4:3 configuration as this has not been observed yet in extrasolar planetary systems.

I've been so horrified indeed.

However could this be someway an example of planets in trojan configuration or simply resonant one?
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Re: 24 Sex and HD 200964 - Multi-planet systems in resonance

Post by Sirius_Alpha on 29th July 2010, 9:36 am

Definately 1:2 and 3:4 resonances, take a look at the RV curves for the planets. A trojan, 1:1 resonance would look quite different.

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Re: 24 Sex and HD 200964 - Multi-planet systems in resonance

Post by Edasich on 29th July 2010, 4:19 pm

I see. Once some claimed the possible existence of a Trojan pair of Jovian around Tau1 Gruis. There has been no update so far. That sounds exotic. Smile
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Re: 24 Sex and HD 200964 - Multi-planet systems in resonance

Post by Sirius_Alpha on 6th November 2012, 9:20 pm

Resonances Required: Dynamical Analysis of the 24 Sex and HD 200964 Planetary Systems
http://arxiv.org/abs/1211.1078

Mutual inclinations are deadly to the systems stability. Resonances are required to preserve the systems.

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Re: 24 Sex and HD 200964 - Multi-planet systems in resonance

Post by Lazarus on 7th November 2012, 3:47 pm

They got their Latin right as well!
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Re: 24 Sex and HD 200964 - Multi-planet systems in resonance

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