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Improved signal detection algorithms for unevenly sampled data. Six signals in the radial velocity data for GJ876

Universidad de Chile. Repositorio Académico

 
Título Improved signal detection algorithms for unevenly sampled data. Six signals in the radial velocity data for GJ876
 
Autor Jenkins, James S.
Wuth Sepúlveda, Jorge Iván.
Becerra Yoma, Néstor
Mahu, R.
Rojo Rubke, Patricio Michel
 
Tema methods: data analysis
 
Descripción Artículo de publicación ISI.
The hunt for Earth analogue planets orbiting Sun-like stars has forced the introduction of
novel methods to detect signals at, or below, the level of the intrinsic noise of the observations.
We present a new global periodogram method that returns more information than the classic
Lomb–Scargle periodogram method for radial velocity signal detection. Our method uses the
minimum mean-squared error as a framework to determine the optimal number of genuine
signals present in a radial velocity timeseries using a global search algorithm, meaning that we
can discard noise spikes from the data before a follow-up analysis. This method also allows
us to determine the phase and amplitude of the signals we detect, meaning that we can track
these quantities as a function of time to test if the signals are stationary or non-stationary.
We apply our method to the radial velocity data for GJ876 as a test system to highlight how
the phase information can be used to select against the non-stationary sources of detected
signals in radial velocity data, such as rotational modulation of star spots. Analysis of this
system yields two new statistically significant signals in the combined Keck and HARPS
velocities with periods of 10 and 15 d. Although a planet with a period of 15 d would relate to
a Laplace resonant chain configuration with three of the other planets (8:4:2:1), we stress that
the follow-up dynamical analyses are needed to test the reliability of such a six-planet system.
 
Fecha 2014-08-18T20:48:25Z
2015-03-13T13:01:03Z
2014-08-18T20:48:25Z
2015-03-13T13:01:03Z
2014-04-04
 
Tipo Artículo de revista
 
Enlace MNRAS 441, 2253–2265 (2014)
doi:10.1093/mnras/stu683
http://repositorio.uchile.cl/handle/2250/126468
 
Idioma en_US
 
Publicador Montlhy Notices of The Royal Society Astronomy