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J/ApJ/666/475       Extrasolar planet taxonomy               (Marchi+, 2007)

Extrasolar planet taxonomy: a new statistical approach. Marchi S. <Astrophys. J., 666, 475-485 (2007)> =2007ApJ...666..475M
ADC_Keywords: Planets Keywords: planetary systems - planetary systems: formation - planets and satellites: general Abstract: In this paper we present the guidelines for an extrasolar planet taxonomy. The discovery of an increasing number of extrasolar planets showing a vast variety of planetary parameters, such as Keplerian orbital elements, and environmental parameters, such as stellar masses, spectral types, and metallicity, prompts the development of a planetary taxonomy. In this work, via principal component analysis followed by hierarchical clustering analysis, we report the definition of five robust groups of planets. We also discuss the physical relevance of such analysis, which may provide a valid basis for disentangling the role of the several physical parameters involved in the processes of planet formation and subsequent evolution. For instance, we were able to divide the hot Jupiters into two main groups on the basis of their stellar masses and metallicities. Moreover, for some groups, we find strong correlations among metallicity, semimajor axis, and eccentricity. The implications of these findings are discussed. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 87 184 Details on extrasolar planet clusters
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 2 A2 --- Cl Cluster identification (1) 4- 18 A15 --- Name Planet name 20- 25 A6 --- Class Class of planet (2) 27- 32 F6.3 jovMass Mass Planet mass in Jupiter masses 34- 38 F5.3 AU a Semi-major axis 40- 46 F7.2 d Per Orbital period 48- 53 F6.3 --- e Orbital eccentricity 55- 59 F5.3 solMass Mstar Mass of central star 61- 66 F6.3 --- [Fe/H] Metallicity 68- 73 F6.3 --- pc1 First principal component (3) 75- 80 F6.3 --- pc2 Second principal component (3) 82- 87 F6.3 --- pc3 Third principal component (3)
Note (1): Table 1: Relevant Data for Extrasolar Planet Clusters -------------------------------------------------------------------------- Cluster Prototype Memb Corr HJ T MSS MPS SS -------------------------------------------------------------------------- C1 HD 41004Ab 11 Mp-e, Mp-Ms 2 6 C2 HD 69830c 46 a-e, a-[Fe/H] 17 5 4 13 C3 HD 11964b 48 a-[Fe/H], e-[Fe/H], Ms-[Fe/H] 23 4 11 8 Jupiter C4 HD 142022Ab 48 Mp-e, Mp-Ms 12 12 C5 HD 117207b 31 1 7 13 ------------------------------------------------------------------------------ Where "Corr" corresponds to all significant intracluster correlations, i.e., those having two-tailed probability less then 5%, with C2, C3, and C4 being the most important ones. "T" corresponds to transiting planets. "MSS" corresponds to planets in multiple star systems. "MPS" corresponds to multiple planetary systems. "SS" corresponds to solar system planets. Note (2): Class of planet is as follows: b = prototype planet d = Planets in multiple star systems dd = Planets in multiple planetary systems h = Hot Jupiters vh = Very hot Jupiters t = Transiting planets Note (3): Variables used in the principal component analysis method.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 08-Oct-2009
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