Publications
Latest research, key results from my thesis (Kalyaan + 2015, 2019) and some intermediate papers where I have contributed to the modeling and which mark modeling developments and key insights I have used in later works.
1. JWST reveals excess cool water near the snowline in compact disks, consistent with pebble drift (Banzatti+2023)
JWST-MIRI Spectra reveal a cool water vapor excess in compact disks (vs extended disks), which is consistent with delivery of water brought in via pebble drift. This result is consistent with our previous numerical work (Kalyaan+2023, 2021).
2. The Effect of Dust Evolution and Traps on Inner Disk Water Enrichment (Kalyaan+2023)
Building on Kalyaan+2021, we further develop our numerical models by including dust evolution (adapting the twopoppy model of Birnstiel+2012) and planetesimal formation via streaming instability and find that water vapor enrichment due to icy pebble delivery in the inner disk is sensitive to the fragmentation velocity of the drifting icy grains, turbulent viscosity alpha and as well as the presence and properties of gaps in the disk. Among gaps, deep inner gaps have the most impact on water vapor enrichment, and can efficiently block the delivery of icy pebbles.
3. Linking Outer Disk Pebble Dynamics and Gaps to Inner Disk Water Enrichment (Kalyaan+2021)
We investigate how the presence of gaps in the outer disk affects pebble dynamics and mass of pebbles drifting into the inner disk. These pebbles carry water ice that sublimate within the water snowline. Our models show that H2O abundances from IR spectra can be used to reveal pebble mass influx crucial for planet formation models.
4. Snow lines and Distribution of Water across a Non-uniformly Turbulent Disk
(Kalyaan & Desch 2019)
We study how radially varying turbulent viscosity might change the bulk water content in bodies that grow at varying distances from the star. We explore the effect of three models – a standard uniform alpha disk, an MRI alpha disk and a “hybrid” wind+hydrodynamic instabilities alpha disk and see how differently is water distributed across the disk in each case.
5. Non-Uniform Turbulent Viscosity and Photoevaporation (Kalyaan+ 2015)
We study the structure and evolution of disks with non-uniform turbulent viscosity, with external photo evaporation. This study uses 1+1D models to calculate alpha(r) using Bai & Stone (2011) formulations. We also include external photoevaporation, to arrive at disk structure that might have been similar to our own solar nebula.
6. Formulas of Radial Transport in Protoplanetary Disks
(Desch+2017)
A review of different evolution equations for radial transport of gaseous tracers and solids in protoplanetary disks used in previous works. We show that the particular diffusion equations used for radial transport of volatiles (here water vapor) can affect the overall bulk distribution of water in the disk, especially the abundances of icy pebbles beyond the water snow line. Different colors here show different treatments used for volatile transport. Dashed lines are at 0.1 Myr, solid lines at 1 Myr for each treatment.
7. Effect of Jupiter’s Formation on the Distribution of Refractory Elements and Inclusions in the Solar Nebula (Desch+2018)
We find a disk evolution model that matches many spatial and temporal constraints from meteoritics relating to the distribution of CAIs (Calcium aluminum inclusions), which follows the formation of a gap by Jupiter’s core.