Probing Inner-Edge of Dead Zones in Protoplanetary Disks with ALMA and Next Generation Very Large Array

Abstract

The discovery of substructures in protoplanetary disks with ALMA has provided us key insights on the formation of planets. However, observational constraints on the formation of rocky planets have been still sparse, especially because of the limited spatial resolution. The inner edge of so-called dead zone is one of the preferential sites of rocky planet formation. We investigate the capabilities of ALMA and ngVLA for observing a dust concentration expected at the inner edge of the dead-zone around a Herbig star. Herbig Ae/Be stars are useful laboratories for exploring the evolution of rocky grains in protoplanetary disks because of their high luminosity which pushes the dead-zone inner edge outward. We find that, thanks to its unprecedented angular resolution and sensitivity, ngVLA can detect the dust concentration at the dead-zone inner edge, with a reasonable integration time of 10 hrs at $\lambda =3,7$ mm and 1 cm. The dust concentration is expected to be optically thick at the ALMA wavelengths and cannot be spatially resolved due to its limited resolution. On the other hand, the flux density from the inner disk regions ($\sim$3--4 au) observed with current VLA is higher for disks with a dust ring, and hence would be a useful indicator that help us choose potential candidates of disks having a dust concentration at the inner most region. With these observations we can characterize the process of dust concentration in the innermost disk regions, where rocky planets can form.

9 pages, 7 figures, accepted for publication in ApJ

References in corpus (17)

• Particle Stirring in Turbulent Gas Disks: Including Orbital Oscillations
• Observations of Protoplanetary Disk Structures
• How to form planetesimals from mm-sized chondrules and chondrule aggregates
• Structure of Herbig AeBe disks at the milliarcsecond scale A statistical survey in the H band using PIONIER-VLTI
• 3D Radiation Non-ideal Magnetohydrodynamical Simulations Of The Inner Rim In Protoplanetary Disks
• Circumstellar disks around Herbig Be stars
• Assembling the Building Blocks of Giant Planets around Intermediate Mass Stars
• Sticking Properties of Silicates in Planetesimal Formation Revisited
• Homogeneous study of Herbig Ae/Be stars from spectral energy distributions and Gaia EDR3
• Planet formation and migration near the silicate sublimation front in protoplanetary disks
• The GRAVITY Young Stellar Object survey -- I. Probing the disks of Herbig Ae/Be stars in terrestrial orbits
• MRI-active inner regions of protoplanetary discs. I. A detailed model of disc structure
• Rocky Planetesimal Formation Aided by Organics
• Analytic Expressions for the Inner-Rim Structure of Passively Heated Protoplanetary Disks
• Radio Monitoring of Protoplanetary Discs
• Imaging the Dusty Substructures due to Terrestrial Planets in Planet-forming Disks with ALMA and the Next Generation Very Large Array
• Testing photoevaporation and MHD disk wind models through future high-angular resolution radio observations: the case of TW Hydrae

Cited by in corpus (2)

• Global magnetohydrodynamic simulations of the inner regions of protoplanetary discs. I. Zero-net flux regime
• Modelling the Break in the Specific Angular Momentum within the Envelope-Disk Transition Zone