Astronomy and Astrophysics – Astrophysics – Earth and Planetary Astrophysics
Scientific paper
2009-01-12
Astronomy and Astrophysics
Astrophysics
Earth and Planetary Astrophysics
5 pages, 4 figures; Accepted on 2009 January 3 by MNRAS Letters
Scientific paper
10.1111/j.1745-3933.2009.00619.x
The extrasolar planets (EPs) so far detected are very different to the planets in our own Solar System. Many of them have Jupiter-like masses and close-in orbits (the so-called hot planets, HPs), with orbital periods of only a few days. In this paper, we present a new statistical analysis of the observed EPs, focusing on the origin of the HPs. Among the several HP formation mechanisms proposed so far, the two main formation mechanisms are type II migration and scattering. In both cases, planets form beyond the so-called snow-line of the protoplanetary disk and then migrate inward due to angular momentum and energy exchange with either the protoplanetary disk or with companion planets. Although theoretical studies produce a range of observed features, no firm correspondence between the observed EPs and models has yet been established. In our analysis, by means of principal component analysis and hierarchical cluster analysis, we find convincing indications for the existence of two types of HPs, whose parameters reflect physical mechanisms of type II migration and scattering.
Ida Shigeru
Marchi Simone
Nagasawa Michiyasu
Ortolani Sergio
No associations
LandOfFree
On the various origins of close-in extrasolar planets does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On the various origins of close-in extrasolar planets, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the various origins of close-in extrasolar planets will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-532397