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 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