Michael Johne Micrometeorite
Number of posts : 14 Age : 41 Location : Bremen, Germany Registration date : 2008-06-16
| Subject: Detecting Extra-solar Planets with a Bayesian hybrid MCMC Kepler periodogram 13th February 2009, 4:01 am | |
| Hi!http://de.arxiv.org/abs/0902.2014 - Quote :
- A Bayesian re-analysis of published radial velocity data sets is providing evidence for additional planetary candidates. The nonlinear model fitting is accomplished with a new hybrid Markov chain Monte Carlo (HMCMC) algorithm which incorporates parallel tempering, simulated annealing and genetic crossover operations. Each of these features facilitate the detection of a global minimum in chi^2. By combining all three, the HMCMC greatly increases the probability of realizing this goal. When applied to the Kepler problem it acts as a powerful multi-planet Kepler periodogram for both parameter estimation and model selection. The HMCMC algorithm is embedded in a unique two stage adaptive control system that automates the tuning of the MCMC proposal distributions through an annealing operation.
Bye! | |
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Stardust Micrometeorite
Number of posts : 5 Age : 59 Location : Campinas, Brasil Registration date : 2009-02-03
| Subject: Re: Detecting Extra-solar Planets with a Bayesian hybrid MCMC Kepler periodogram 13th February 2009, 9:47 am | |
| From the article above: "...Fig. 4 shows the results of a blind three planet search for two different trials on HD 11964 (87 radial velocity measurements) which we previously demonstrated has 3 planets (Gregory 2007b) with periods of 38, 360, and 1924 d..." I was reading the EPE and the second planet (with a orbital periodo of 360 days) isnĀ“t listed as orbiting HD 11964. I also search EPE at the nonconfirmed planets link, and this planet isn't listed. Does someone knows something about this? Thank you! | |
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Sirius_Alpha Admin
Number of posts : 4319 Location : Earth Registration date : 2008-04-06
| Subject: Re: Detecting Extra-solar Planets with a Bayesian hybrid MCMC Kepler periodogram 13th February 2009, 10:18 am | |
| There was talk about such a planet a year or so ago, and a recent paper failed to identify any third planetary signal. Link to the relevant post _________________ Caps Lock: Cruise control for 'Cool'!
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| Subject: Re: Detecting Extra-solar Planets with a Bayesian hybrid MCMC Kepler periodogram | |
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