Analysis of information sources in references of the Wikipedia article "Anã vermelha" in Portuguese language version.
Close separations (< 1 AU) have been extensively probed by Doppler and transit surveys with the following results: the frequency of close-in giant planets (1−10 M{{{j1}}} {{{j2}}} ) is only 2.5 ± 0.9%, consistent with core accretion plus migration models.