Second planet at HD 240210?

View previous topic View next topic Go down

Second planet at HD 240210?

Post by Sirius_Alpha on 2nd July 2010, 4:59 am

Modeling the Radial Velocities of HD 240210 with the Genetic Algorithms
http://arxiv.org/abs/1007.0029

Abstract wrote:More than 450 extrasolar planets are known to date. To detect these intriguing objects, many photometric and radial velocity (RV) surveys are in progress. We developed the Keplerian FITting (KFIT) code, to model published and available RV data. KFIT is based on a hybrid, quasi-global optimization technique relying on the Genetic Algorithms and simplex algorithm. Here, we re-analyse the RV data of evolved K3III star HD 240210. We confirm three equally good solutions which might be interpreted as signals of 2-planet systems. Remarkably, one of these best-fits describes the long-term stable two-planet system, involved in the 2:1~mean motion resonance (MMR). It may be the first instance of this strong MMR in a multi-planet system hosted by evolved star, as the 2:1 MMR configurations are already found around a few solar dwarfs.

_________________
Caps Lock: Cruise control for 'Cool'!

Sirius_Alpha
Admin
Admin

Number of posts : 3383
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: Second planet at HD 240210?

Post by Edasich on 2nd July 2010, 2:11 pm

Looks like a curious orbital configuration, having a 6.9 Mj planet at 1.33 AUs in slightly eccentric orbit (e=0,15) and a 2nd planet with 3.8 Mj at 2.1 AUs and e=0.58.

Authors reckon it stable.

Edasich
dM star
dM star

Number of posts : 1499
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Second planet at HD 240210?

Post by Lazarus on 3rd July 2010, 9:31 pm

Be interesting to see how the solution behaves when integrated forwards in time. If that is the real configuration I suspect it may have large mutual inclination though.

Lazarus
dG star
dG star

Number of posts : 2750
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Second planet at HD 240210?

Post by Sirius_Alpha on 3rd July 2010, 9:34 pm

How do resonant configurations behave with large mutual inclinations?

_________________
Caps Lock: Cruise control for 'Cool'!

Sirius_Alpha
Admin
Admin

Number of posts : 3383
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: Second planet at HD 240210?

Post by Sponsored content


Sponsored content


Back to top Go down

View previous topic View next topic Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum