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Astrophysics > Earth and Planetary Astrophysics

Title:
The Solar System as an Exoplanetary System

Abstract: With the availability of considerably more data, we revisit the question of
how special our Solar System is, compared to observed exoplanetary systems. To
this goal, we employ a mathematical transformation that allows for a
meaningful, statistical comparison. We find that the masses and densities of
the giant planets in our Solar System are very typical, as is the age of the
Solar System. While the orbital location of Jupiter is somewhat of an outlier,
this is most likely due to strong selection effects towards short-period
planets. The eccentricities of the planets in our Solar System are relatively
small compared to those in observed exosolar systems, but still consistent with
the expectations for an 8-planet system (and could, in addition, reflect a
selection bias towards high-eccentricity planets). The two characteristics of
the Solar System that we find to be most special are the lack of super-Earths
with orbital periods of days to months and the general lack of planets inside
of the orbital radius of Mercury. Overall, we conclude that in terms of its
broad characteristics our Solar System is not expected to be extremely rare,
allowing for a level of optimism in the search for extrasolar life.