The newborn planet population emerging from ring-like structures in discs

Abstract

ALMA has observed a plethora of ring-like structures in planet forming discs at distances of 10-100 au from their host star. Although several mechanisms have been invoked to explain the origin of such rings, a common explanation is that they trace new-born planets. Under the planetary hypothesis, a natural question is how to reconcile the apparently high frequency of gap-carving planets at 10-100 au with the paucity of Jupiter mass planets observed around main sequence stars at those separations. Here, we provide an analysis of the new-born planet population emerging from observations of gaps in discs, under the assumption that the observed gaps are due to planets. We use a simple estimate of the planet mass based on the gap morphology, and apply it to a sample of gaps recently obtained by us in a survey of Taurus with ALMA. We also include additional data from recent published surveys, thus analysing the largest gap sample to date, for a total of 48 gaps. The properties of the purported planets occupy a distinctively different region of parameter space with respect to the known exo-planet population, currently not accessible through planet finding methods. Thus, no discrepancy in the mass and radius distribution of the two populations can be claimed at this stage. We show that the mass of the inferred planets conforms to the theoretically expected trend for the minimum planet mass needed to carve a dust gap. Finally, we estimate the separation and mass of the putative planets after accounting for migration and accretion, for a range of evolutionary times, finding a good match with the distribution of cold Jupiters.

9 pages, 5 figures, re-submitted to MNRAS after referee's comments

References in corpus (23)

• New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
• A Steeper than Linear Disk Mass-Stellar Mass Scaling Relation
• Separating gas-giant and ice-giant planets by halting pebble accretion
• Ring shaped dust accumulation in transition disks
• Evidence of fast pebble growth near condensation fronts in the HL Tau protoplanetary disk
• The structure of protoplanetary discs around evolving young stars
• A Three-Dimensional View of Turbulence: Constraints on Turbulent Motions in the HD 163296 Protoplanetary Disk using DCO${}^{+}$
• Hints for a Turnover at the Snow Line in the Giant Planet Occurrence Rate
• Migration of massive planets in accreting disks
• Reduced gas accretion on super-Earths and ice giants
• Physical properties of dusty protoplanetary disks in Lupus: evidence for viscous evolution?
• Gas accretion onto planetary cores: three-dimensional self-gravitating radiation hydrodynamical calculations
• The Mass Budget of Planet Forming Discs: Isolating the Epoch of Planetesimal Formation
• Planet population synthesis driven by pebble accretion in cluster environments
• An opening criterion for dust gaps in protoplanetary discs
• Deserts and pile-ups in the distribution of exoplanets due to photoevaporative disc clearing
• The masses of young stars: CN as a probe of dynamical masses
• A Direct Imaging Survey of Spitzer detected debris disks: Occurrence of giant planets in dusty systems
• Dynamical Masses of Low Mass Stars in the Taurus and Ophiuchus Star Forming Regions
• MASSIVE: A Bayesian analysis of giant planet populations around low-mass stars
• Runaway gas accretion and gap opening versus type~I migration
• Gap and rings carved by vortices in protoplanetary dust
• Planetary Migration to Large Radii

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• No significant correlation between radial velocity planet presence and debris disc properties
• Planet Migration in Self-Gravitating Discs: Survival of Planets
• Is the gap in the DS Tau disc hiding a planet?
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• A search for companions via direct imaging in the DSHARP planet-forming disks
• TW Hya: an old protoplanetary disc revived by its planet
• Promoted Mass Growth of Multiple, Distant Giant Planets through Pebble Accretion and Planet-Planet Collision
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• A Machine Learning model to infer planet masses from gaps observed in protoplanetary disks
• DPNNet-2.0 Part I: Finding hidden planets from simulated images of protoplanetary disk gaps
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• The role of density perturbation on planet formation by pebble accretion
• Constraining giant planet formation with synthetic ALMA images of the Solar System's natal protoplanetary disk
• The paradox of youth for ALMA planet candidates
• Investigating the Future Potential of an Upgraded ALMA to Image Planet Forming Disks at Sub-au Scales
• Formation of ring-like structures in flared α-discs with X-ray/FUV photoevaporation
• The effect of late giant collisions on the atmospheres of protoplanets and the formation of cold sub-Saturns