INVESTIGADORES
BRUNINI Adrian
artículos
Título:
Planet formation: statistics of spin rates and obliquities of extrasolar planets
Autor/es:
MIGUEL, Y.; BRUNINI, A.
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2010 vol. 406 p. 1935 - 1943
ISSN:
0035-8711
Resumen:
Abstract
We develop a simple model of planetary formation,
focusing our attention
on those planets with masses less than
10M<SUB>?</SUB> and
studying particularly the primordial spin parameters
of planets
resulting from the accretion of planetesimals and
produced by the
collisions between the embryos. As initial conditions,
we adopt the
oligarchic growth regime of protoplanets in a disc
where several embryos
are allowed to form. We take different initial
planetary system
parameters and for each initial condition, we consider
an evolution of 2
× 10<SUP>7</SUP>yr of the system. We
perform simulations for 1000
different discs, and from their results we derive the
statistical
properties of the assembled planets. We have taken
special attention to
the planetary obliquities and rotation periods, such
as the information
obtained from the mass and semimajor axis diagram,
which reflects the
process of planetary formation. The distribution of
obliquities was
found to be isotropic, which means that planets can
rotate in direct or
indirect sense, regardless of their mass. Our results
regarding the
primordial rotation periods show that they are
dependent on the region
where the embryo was formed and evolved. According to
our results, most
of the planets have rotation periods between 10 and
10000h and there are
also a large population of planets similar to
terrestrial planets in the
Solar system.