期刊
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
卷 182, 期 1, 页码 205-215出版社
IOP PUBLISHING LTD
DOI: 10.1088/0067-0049/182/1/205
关键词
astrometry; methods: data analysis; methods: numerical; planetary systems; techniques: radial velocities
资金
- NSF [AST-0504874]
- NASA [NAS7-03001, 1336910]
We describe a technique for solving for the orbital elements of multiple planets from radial velocity ( RV) and/or astrometric data taken with 1 m s(-1) and mu as precision, appropriate for efforts to detect Earth-massed planets in their stars' habitable zones, such as NASA's proposed Space Interferometry Mission. We include details of calculating analytic derivatives for use in the Levenberg-Marquardt (LM) algorithm for the problems of fitting RV and astrometric data separately and jointly. We also explicate the general method of separating the linear and nonlinear components of a model fit in the context of an LM fit, show how explicit derivatives can be calculated in such a model, and demonstrate the speed up and convergence improvements of such a scheme in the case of a five-planet fit to published RV data for 55 Cnc.
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