  The origin of close-in Jovian planets is still elusive. We examine the
in-situ gas accretion scenario as a formation mechanism of these planets. We
reconstruct natal disk properties from the occurrence rate distribution of
close-in giant planets, under the assumption that the occurrence rate may
reflect the gas accretion efficiency onto cores of these planets. We find that
the resulting gas surface density profile becomes an increasing function of the
distance from the central star with some structure at $r \simeq 0.1$ au. This
profile is quite different from the standard minimum-mass solar nebula model,
while our profile leads to better reproduction of the population of observed
close-in super-Earths based on previous studies. We compute the resulting
magnetic field profiles and find that our profiles can be fitted by stellar
dipole fields ($\propto r^{-3}$) in the vicinity of the central star and
large-scale fields ($\propto r^{-2}$) at the inner disk regions, either if the
isothermal assumption breaks down or if nonideal MHD effects become important.
For both cases, the transition between these two profiles occurs at $r \simeq
0.1$ au, which corresponds to the period valley of giant exoplanets. Our work
provides an opportunity to test the in-situ gas accretion scenario against disk
quantities, which may constrain the gas distribution of the minimum-mass {\it
extra}solar nebula.
