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Unveiling exoplanet families

Published online by Cambridge University Press:  01 October 2007

Simone Marchi
Affiliation:
Dipartimento di Astronomia, University of Padova, I-35122 Padova, Italy email: simone.marchi@unipd.it, sergio.ortolani@unipd.it
Sergio Ortolani
Affiliation:
Dipartimento di Astronomia, University of Padova, I-35122 Padova, Italy email: simone.marchi@unipd.it, sergio.ortolani@unipd.it
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Abstract

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The discovery of an increasing number of extrasolar planets (EPs) prompts the development of a planetary taxonomy. Such analysis, as in many other fields of research, is useful to identify groups of objects sharing similar traits. When applied to extrasolar planets, the taxonomy may provide a valid support for disentangling the role of the several physical parameters (semimajor axis, metallicity etc.) involved in the planetary formation processes and subsequent evolution. We present the state-of-the-art for exoplanets taxonomy obtained with hierarchical algorithms and the definition of robust clusters of planets (this is an update of the taxonomy published in Marchi 2007). The physical relevance of the exoplanet clusters along with their implications for the formation theories are also discussed. Finally, we comment on the future improvements of such analysis taking into account new algorithms and new input variables.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2008

References

Everitt, B. S. & Dunn, G. 2001, Applied multivariate data analysis, second edition, Arnold, Ed., LondonCrossRefGoogle Scholar
Everitt, B. S., Landau, S., & Leese, Morven. 2001, Cluster analysis, fourth edition, Arnold, Ed., LondonGoogle ScholarPubMed
Girardi, L., Bertelli, G., Bressan, A., Chiosi, C., Groenewegen, M. A. T., Marigo, P., Salasnich, B., & Weiss, A. 2002, A&A, 391, 195Google Scholar
Marchi, S. 2007, ApJ, 666, 475CrossRefGoogle Scholar
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