Constraining the properties of the potential embedded planets in the disk around HD 100546

Abstract

Context. The protoplanetary disk around the star HD 100546 displays prominent substructures in the form of two concentric rings. Recent observations with the Atacama Large Millimeter/sub-millimeter Array (ALMA) have revealed these features with high angular resolution and have resolved the faint outer ring well. This allows us to study the nature of the system further. Aims. Our aim is to constrain some of the properties of potential planets embedded in the disk, assuming that they induce the observed rings and gaps. Methods. We present the self-calibrated $0.9$mm ALMA observations of the dust continuum emission from the circumstellar disk around HD 100546. These observations reveal substructures in the disk that are consistent with two rings, the outer ring being much fainter than the inner one. We reproduced this appearance closely with a numerical model that assumes two embedded planets. We varied planet and disk parameters in the framework of the planet-disk interaction code FARGO3D and used the outputs for the gas and dust distribution to generate synthetic observations with the code RADMC-3D. Results. From this comparison, we find that an inner planet located at $r_1=13$au with a mass $M_1=8M_{\mathrm{Jup}}$ and an outer planet located at $r_2=143$au with a mass $M_2=3M_{\mathrm{Jup}}$ leads to the best agreement between synthetic and ALMA observations (deviation less than $3\sigma$ for the normalized radial profiles). To match the very low brightness of the outer structure relative to the inner ring, the initial disk gas surface density profile needs to follow an exponentially tapered power law (self-similar solution), rather than a simple power-law profile.

Accepted for publication in A&A

References in corpus (15)

• Ring shaped dust accumulation in transition disks
• Dust filtration at gap edges: Implications for the spectral energy distributions of discs with embedded planets
• Multiple Disk Gaps and Rings Generated by a Single Super-Earth
• The newborn planet population emerging from ring-like structures in discs
• Dust Trapping by Vortices in Transitional Disks: Evidence for Non-ideal MHD Effects in Protoplanetary Disks
• ALMA hints at the presence of two companions in the disk around HD 100546
• Can dead zones create structures like a transition disk?
• The Ophiuchus DIsc Survey Employing ALMA (ODISEA)-III: the evolution of substructures in massive discs at 3-5 au resolution
• Recovery of the Candidate Protoplanet HD 100546 b with Gemini/NICI and Detection of Additional (Planet-Induced?) Disk Structure at Small Separations
• Gas and dust structures in protoplanetary disks hosting multiple planets
• NIR Spectroscopy of the HAeBe Star HD 100546: III. Further Evidence of an Orbiting Companion?
• Limits on Millimeter Continuum Emission from Circumplanetary Material in the DSHARP Disks
• Predicting the observational signature of migrating Neptune-sized planets in low-viscosity disks
• Influence of planetary gas accretion on the shape and depth of gaps in protoplanetary discs
• ALMA 870 $\mu$m continuum observations of HD 100546. Evidence of a giant planet on a wide orbit