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Extrasolar Visions II

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

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lodp
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24 Sex and HD 200964 - Multi-planet systems in resonance Empty
PostSubject: 24 Sex and HD 200964 - Multi-planet systems in resonance   24 Sex and HD 200964 - Multi-planet systems in resonance Empty27th July 2010, 8:12 pm

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Sirius_Alpha
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24 Sex and HD 200964 - Multi-planet systems in resonance Empty
PostSubject: Re: 24 Sex and HD 200964 - Multi-planet systems in resonance   24 Sex and HD 200964 - Multi-planet systems in resonance Empty27th 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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24 Sex and HD 200964 - Multi-planet systems in resonance Empty
PostSubject: Re: 24 Sex and HD 200964 - Multi-planet systems in resonance   24 Sex and HD 200964 - Multi-planet systems in resonance Empty27th July 2010, 8:39 pm

HD 200964
24 Sex and HD 200964 - Multi-planet systems in resonance HD200964

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

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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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Lazarus
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24 Sex and HD 200964 - Multi-planet systems in resonance Empty
PostSubject: Re: 24 Sex and HD 200964 - Multi-planet systems in resonance   24 Sex and HD 200964 - Multi-planet systems in resonance Empty28th 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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Sirius_Alpha
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PostSubject: Re: 24 Sex and HD 200964 - Multi-planet systems in resonance   24 Sex and HD 200964 - Multi-planet systems in resonance Empty28th 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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Edasich
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24 Sex and HD 200964 - Multi-planet systems in resonance Empty
PostSubject: Re: 24 Sex and HD 200964 - Multi-planet systems in resonance   24 Sex and HD 200964 - Multi-planet systems in resonance Empty29th 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. 24 Sex and HD 200964 - Multi-planet systems in resonance Icon_eek 24 Sex and HD 200964 - Multi-planet systems in resonance Icon_lol

However could this be someway an example of planets in trojan configuration or simply resonant one?
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Sirius_Alpha
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24 Sex and HD 200964 - Multi-planet systems in resonance Empty
PostSubject: Re: 24 Sex and HD 200964 - Multi-planet systems in resonance   24 Sex and HD 200964 - Multi-planet systems in resonance Empty29th 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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PostSubject: Re: 24 Sex and HD 200964 - Multi-planet systems in resonance   24 Sex and HD 200964 - Multi-planet systems in resonance Empty29th 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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24 Sex and HD 200964 - Multi-planet systems in resonance Empty
PostSubject: Re: 24 Sex and HD 200964 - Multi-planet systems in resonance   24 Sex and HD 200964 - Multi-planet systems in resonance Empty6th 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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PostSubject: Re: 24 Sex and HD 200964 - Multi-planet systems in resonance   24 Sex and HD 200964 - Multi-planet systems in resonance Empty7th November 2012, 3:47 pm

They got their Latin right as well!
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Lazarus
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24 Sex and HD 200964 - Multi-planet systems in resonance Empty
PostSubject: Re: 24 Sex and HD 200964 - Multi-planet systems in resonance   24 Sex and HD 200964 - Multi-planet systems in resonance Empty15th August 2019, 1:25 pm

Alternative solutions to HD 200964 now include 3:2 and 7:5 in addition to the originally-suggested 4:3.

Rosenthal et al. "Measuring the Orbital Parameters of Radial Velocity Systems in Mean Motion Resonance---a Case Study of HD 200964"
https://arxiv.org/abs/1908.04789

The 7:5 is the best fit to the data, but it's easier to explain the formation of a 3:2 resonance.
Quote :
The original identification of a 4:3 resonance was puzzling on theoretical grounds, as convergent migration of gas giants strongly prefers capture into the 3:2 rather than the 4:3 or 7:5. It is interesting to note that with the inclusion of more data the period ratio has gone up. We conclude that, this fact, along with the errors underlying the radial velocity measurements and the long timescale variation provided by libration of the resonant angle generate sufficient uncertainty in the period ratio that the 3:2 remains a plausible solution to the observed signal.

More data needed then...
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