Influence of planetary gas accretion on the shape and depth of gaps in protoplanetary discs. (arXiv:2010.00485v2 [astro-ph.EP] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Bergez_Casalou_C/0/1/0/all/0/1">C. Bergez-Casalou</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bitsch_B/0/1/0/all/0/1">B. Bitsch</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pierens_A/0/1/0/all/0/1">A. Pierens</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Crida_A/0/1/0/all/0/1">A. Crida</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Raymond_S/0/1/0/all/0/1">S. N. Raymond</a>
It is widely known that giant planets have the capacity to open deep gaps in
their natal gaseous protoplanetary discs. It is unclear, however, how gas
accretion onto growing planets influences the shape and depth of their growing
gaps. We performed isothermal hydrodynamical simulations with the Fargo-2D1D
code, which assumes planets accreting gas within full discs that range from 0.1
to 260 AU. The gas accretion routine uses a sink cell approach, in which
different accretion rates are used to cope with the broad range of gas
accretion rates cited in the literature. We find that the planetary gas
accretion rate increases for larger disc aspect ratios and greater viscosities.
Our main results show that gas accretion has an important impact on the
gap-opening mass: we find that when the disc responds slowly to a change in
planetary mass (i.e., at low viscosity), the gap-opening mass scales with the
planetary accretion rate, with a higher gas accretion rate resulting in a
larger gap-opening mass. On the other hand, if the disc response time is short
(i.e., at high viscosity), then gas accretion helps the planet carve a deep
gap. As a consequence, higher planetary gas accretion rates result in smaller
gap-opening masses. Our results have important implications for the derivation
of planet masses from disc observations: depending on the planetary gas
accretion rate, the derived masses from ALMA observations might be off by up to
a factor of two. We discuss the consequences of the change in the gap-opening
mass on the evolution of planetary systems based on the example of the grand
tack scenario. Planetary gas accretion also impacts stellar gas accretion,
where the influence is minimal due to the presence of a gas-accreting planet.
It is widely known that giant planets have the capacity to open deep gaps in
their natal gaseous protoplanetary discs. It is unclear, however, how gas
accretion onto growing planets influences the shape and depth of their growing
gaps. We performed isothermal hydrodynamical simulations with the Fargo-2D1D
code, which assumes planets accreting gas within full discs that range from 0.1
to 260 AU. The gas accretion routine uses a sink cell approach, in which
different accretion rates are used to cope with the broad range of gas
accretion rates cited in the literature. We find that the planetary gas
accretion rate increases for larger disc aspect ratios and greater viscosities.
Our main results show that gas accretion has an important impact on the
gap-opening mass: we find that when the disc responds slowly to a change in
planetary mass (i.e., at low viscosity), the gap-opening mass scales with the
planetary accretion rate, with a higher gas accretion rate resulting in a
larger gap-opening mass. On the other hand, if the disc response time is short
(i.e., at high viscosity), then gas accretion helps the planet carve a deep
gap. As a consequence, higher planetary gas accretion rates result in smaller
gap-opening masses. Our results have important implications for the derivation
of planet masses from disc observations: depending on the planetary gas
accretion rate, the derived masses from ALMA observations might be off by up to
a factor of two. We discuss the consequences of the change in the gap-opening
mass on the evolution of planetary systems based on the example of the grand
tack scenario. Planetary gas accretion also impacts stellar gas accretion,
where the influence is minimal due to the presence of a gas-accreting planet.
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