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SUMMARY:Impact of radiative feedback on the dynamics and formation of low-
 mass protoplanets - Dr. Frederic Masset - Universidad Nacional Autónoma d
 e México
DTSTART:20220307T140000Z
DTEND:20220307T150000Z
UID:TALK166279@talks.cam.ac.uk
CONTACT:Dr Can Cui
DESCRIPTION:I will present new results about the dynamics of hot protoplan
 ets embedded in a gaseous medium with thermal diffusion. The release of he
 at by a luminous planet into the surrounding gas induces a perturbation of
  density that gives rise to a contribution to the gravitational force exer
 ted on the planet. Called thermal force\, this contribution can take vario
 us forms depending on the planet's trajectory and on the gas flow. For a b
 ody traversing a gas at rest on a linear trajectory\, the thermal force is
  opposed to the standard dynamical friction\, and can yield a net accelera
 tion of the body if the latter is sufficiently luminous. In the case of a 
 planet on a circular orbit in a protoplanetary disc\, thermal forces usual
 ly tend to counteract inward migration. When the planet's luminosity is ab
 ove a certain threshold\, they also tend to excite the planet's eccentrici
 ty and inclination to values comparable to the aspect ratio of the disc. F
 inally\, I will present results from N-body calculations of a collection o
 f pebble accreting embryos\, for which the effects of thermal forces are i
 ncorporated. Compared to more standard calculations in which these effects
  are neglected\, they tend to produce\, over the 1 Myr time span of our ru
 ns\, planets that have a markedly smaller dispersion of masses.\n
LOCATION:Online
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