Astrophysics> Instrumentation and Methods for Astrophysics
arXiv:1206.5798 (astro-ph)
[Submitted on 25 Jun 2012 (v1), last revised 31 Jan 2013 (this version, v3)]
Title:EXOFAST: A fast exoplanetary fitting suite in IDL
View PDFAbstract:We present EXOFAST, a fast, robust suite of routines written in IDL which is designed to fit exoplanetary transits and radial velocity variations simultaneously or separately, and characterize the parameter uncertainties and covariances with a Differential Evolution Markov Chain Monte Carlo method. We describe how our code incorporates both data sets to simultaneously derive stellar parameters along with the transit and RV parameters, resulting in more self-consistent results on an example fit of the discovery data of HAT-P-3b that is well-mixed in under five minutes on a standard desktop computer. We describe in detail how our code works and outline ways in which the code can be extended to include additional effects or generalized for the characterization of other data sets -- including non-planetary data sets. We discuss the pros and cons of several common ways to parameterize eccentricity, highlight a subtle mistake in the implementation of MCMC that could bias the inferred eccentricity of intrinsically circular orbits to significantly non-zero results, discuss a problem with IDL's built-in random number generator in its application to large MCMC fits, and derive a method to analytically fit the linear and quadratic limb darkening coefficients of a planetary transit. Finally, we explain how we achieved improved accuracy and over a factor of 100 improvement in the execution time of the transit model calculation. Our entire source code, along with an easy-to-use online interface for several basic features of our transit and radial velocity fitting, are available online at this http URL .
| Comments: | Source code and online interface available at this http URL 26 pages, 8 figures, updated to match published version |
| Subjects: | Instrumentation and Methods for Astrophysics (astro-ph.IM); Earth and Planetary Astrophysics (astro-ph.EP) |
| Cite as: | arXiv:1206.5798 [astro-ph.IM] |
| (or arXiv:1206.5798v3 [astro-ph.IM] for this version) | |
| https://doi.org/10.48550/arXiv.1206.5798
arXiv-issued DOI via DataCite
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| Related DOI: | https://doi.org/10.1086/669497
DOI(s) linking to related resources
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Submission history
From: Jason Eastman [view email][v1] 2012年6月25日 20:00:00 UTC (198 KB)
[v2] 2012年6月27日 01:20:38 UTC (198 KB)
[v3] 2013年1月31日 23:50:33 UTC (201 KB)
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