Giant planet migration during the disc dispersal phase

Abstract

Transition discs are expected to be a natural outcome of the interplay between photoevaporation (PE) and giant planet formation. Massive planets reduce the inflow of material from the outer to the inner disc, therefore triggering an earlier onset of disc dispersal due to PE through a process known as Planet-Induced PhotoEvaporation (PIPE). In this case, a cavity is formed as material inside the planetary orbit is removed by PE, leaving only the outer disc to drive the migration of the giant planet. We investigate the impact of PE on giant planet migration and focus specifically on the case of transition discs with an evacuated cavity inside the planet location. This is important for determining under what circumstances PE is efficient at halting the migration of giant planets, thus affecting the final orbital distribution of a population of planets. For this purpose, we use 2D FARGO simulations to model the migration of giant planets in a range of primordial and transition discs subject to PE. The results are then compared to the standard prescriptions used to calculate the migration tracks of planets in 1D planet population synthesis models. The FARGO simulations show that once the disc inside the planet location is depleted of gas, planet migration ceases. This contradicts the results obtained by the impulse approximation, which predicts the accelerated inward migration of planets in discs that have been cleared inside the planetary orbit. These results suggest that the impulse approximation may not be suitable for planets embedded in transition discs. A better approximation that could be used in 1D models would involve halting planet migration once the material inside the planetary orbit is depleted of gas and the surface density at the 3:2 mean motion resonance location in the outer disc reaches a threshold value of $0.01\mathrm{g}\mathrm{c}{\mathrm{m}}^{-2}$.

16 pages, 11 figures; accepted for publication in A&A

References in corpus (26)

• Two accreting protoplanets around the young star PDS 70
• The XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST)
• Evidence of fast pebble growth near condensation fronts in the HL Tau protoplanetary disk
• Asymmetric features in the protoplanetary disk MWC758
• Three radial gaps in the disk of TW Hydrae imaged with SPHERE
• Shadows and spirals in the protoplanetary disk HD 100453
• X-ray irradiated protoplanetary disk atmospheres I: Predicted emission line spectrum and photoevaporation
• The Migration of Gap-Opening Planets is not Locked to Viscous Disk Evolution
• Migration of massive planets in accreting disks
• On the Occurrence Rate of Hot Jupiters in Different Stellar Environments
• Dust unveils the formation of a mini-Neptune planet in a protoplanetary ring
• An opening criterion for dust gaps in protoplanetary discs
• Deserts and pile-ups in the distribution of exoplanets due to photoevaporative disc clearing
• Hydrodynamic Photoevaporation of Protoplanetary Disks with Consistent Thermochemistry
• On the width and shape of the corotation region for low-mass planets
• The link between disc dispersal by photoevaporation and the semi-major axis distribution of exoplanets
• CO emission tracing a warp or radial flow within $\lesssim$ 100 au in the HD 100546 protoplanetary disk
• Low EUV Luminosities Impinging on Protoplanetary Disks
• The transition disc frequency in M stars
• Detectability of embedded protoplanets from hydrodynamical simulations
• Snow-lines can be thermally unstable
• Revealing signatures of planets migrating in protoplanetary discs with ALMA multi-wavelength observations
• A photo-evaporative gap in the closest planet forming disc
• Radiation-Hydrodynamical Models of X-ray Photoevaporation in Carbon Depleted Circumstellar Discs
• The imprint of X-ray photoevaporation of planet-forming discs on the orbital distribution of giant planets
• Is the gap in the DS Tau disc hiding a planet?

Cited by in corpus (3)

• The dispersal of protoplanetary discs. II: Photoevaporation models with observationally derived irradiating spectra
• Life on Exoplanets In the Habitable Zone of M-Dwarfs?
• Dust entrainment in photoevaporative winds: Synthetic observations of transition disks