Mohit Melwani Daswani

Associate Professor, Earth-Life Science Institute, Institute of Science Tokyo

Research

I study how the interiors of ocean worlds evolve chemically over geological time, and whether that evolution can sustain the conditions life requires. My approach couples thermodynamic and reactive-transport modeling with laboratory measurements, so that predictions about a planet's interior chemistry can be tested against observation rather than left as speculation.

Much of this work concerns rock-water reactions: how water alters primordial minerals, what gases and solutes are released, and whether the resulting chemical disequilibrium could support metabolism. I began by applying these methods to early Mars, using meteorite mineralogy and paleolake deposits to reconstruct the planet's water and carbon budget before its climate collapsed. Since 2018 the same framework has extended to icy ocean worlds (Europa, Ceres, Enceladus, Titan, and the moons of Uranus) where rock metamorphism, rather than tidal heating alone, can generate and sustain chemical energy long after a body's initial ocean forms.

A prediction from this work, that Europa's ocean should be enriched in CO2 from metamorphic outgassing, was confirmed by JWST observations in 2023; coupling interior geochemistry to observable surface and atmospheric signatures gives testable, falsifiable constraints on habitability, rather than qualitative arguments about what a planet might be like.

I am increasingly interested in what this framework can say about sample-return science and mission-relevant targets, where interior models meet what a lander or returned sample can actually measure, and in extending coupled evolution modeling toward exoplanet interiors.

Trajectory

  1. 2025–Associate Professor, Earth-Life Science Institute, Institute of Science Tokyo
  2. 2025–SETI Institute Affiliate
  3. 2020–2026Research Scientist, Jet Propulsion Laboratory, Caltech (ocean world habitability, sample-return mission formulation)
  4. 2018–2020Postdoctoral Scholar & Europa Clipper Project Science Affiliate, JPL (ocean world geochemistry and geophysics, with Steven Vance)
  5. 2015–2017Postdoctoral Scholar, University of Chicago (Mars geochemistry and paleoclimate, with Edwin Kite)
  6. 2011–2015Ph.D., Planetary Science / Geochemistry, The Open University

Computational tools

PlanetProfile — contributing to self-consistent interior structure modeling for ocean worlds and rocky dwarf planets, developed with Steven Vance. Source
DEWPython — a Python implementation of the Deep Earth Water model, for thermodynamic calculations at high pressure and temperature. Source
AccretR — stochastic modeling of planetesimal accretion, used to constrain the initial bulk compositions of small bodies. Source

All three are open source and used by other groups in the ocean worlds and geochemistry communities.

Teaching & mentoring

I have supervised 18 students and postdocs (four PhD students, eight postdocs, six undergraduate interns), several of whom are now at UCLA, Arizona State University, JPL, Marum/U Bremen, and beyond. I lecture in the International Graduate Program at ELSI, Science Tokyo.

I welcome inquiries from prospective students and postdocs whose interests intersect thermodynamics, geochemistry, and planetary interiors. See contact details below.

Publications

37 peer-reviewed papers. Titles link to the paper on the journal's site; a fuller record (with category tags) is in the CV (PDF).

  1. Nisson, D., Melwani Daswani, M. et al. (2026). Thermodynamic constraints on H2 production and habitability from Mg-rich serpentinites as Mars analogs. J. Geophys. Res.: Planets
  2. Wang, C.-C., Usui, T. & Melwani Daswani, M. (2026). A thermochemical modeling perspective of why Ca/Fe carbonates broadly associate with felsic terrains on Mars. J. Geophys. Res.: Planets
  3. Mahboub, L. et al. incl. Melwani Daswani, M. (2026). Electrical properties of icy world oceans from laboratory measurements. ACS Earth Space Chem.
  4. Nixon, C. et al. incl. Melwani Daswani, M. (2026). Terrestrial analogs to Titan for geophysical research. Rev. Geophys., 64, e2025RG000909
  5. Byrne, P. K. et al. incl. Melwani Daswani, M. (2026). Little to no active faulting likely at Europa's seafloor today. Nat. Commun. 17:4
  6. Kadoya, S. & Melwani Daswani, M. (2026). Continued continental weathering during snowball Earth mitigated greenhouse gas buildup and prolonged global glaciation. Earth Planet. Sci. Lett., 679:119837
  7. Miller, K. E., Melwani Daswani, M., Sotin, C. et al. (2026). Titan's refractory core evolution: implications for organics in its subsurface ocean. Icarus, 449:116961
  8. Weber, J. M. et al. incl. Melwani Daswani, M. (2025). Architectures and instruments for Enceladus exploration. J. Geophys. Res.: Planets, 140, e2024JE008715
  9. Bagheri, A. et al. incl. Melwani Daswani, M. (2025). Exploring the interior structure and mode of tidal heating in Enceladus. Planet. Sci. J. 6:10, 245
  10. Courville, S. W., Castillo-Rogez, J. C., Melwani Daswani, M., Robare, J. & O'Rourke, J. G. (2025). Core metamorphism controls dynamical habitability of mid-sized ocean worlds: the case of Ceres. Sci. Adv. 11, eadt3283
  11. Scully, J. E. et al. incl. Melwani Daswani, M. (2025). Small in number but mighty in significance: impact craters as windows into Europa's subsurface. J. Geophys. Res.: Planets, 130:7, e2024JE008670
  12. Işık, S., Melwani Daswani, M. et al. (2025). Thermodynamic constraints on the citric acid cycle and related reactions in ocean world interiors. ACS Earth Space Chem.
  13. Martinez, E. et al. incl. Melwani Daswani, M. (2025). Organic adsorption onto iron hydroxide and sulfide minerals: implications for Ceres sample return analysis. ACS Earth Space Chem.
  14. Petricca, F. et al. incl. Melwani Daswani, M. (2025). Gravity and radio science investigation at the moons of Uranus to reveal subsurface oceans and characterize interior structures. J. Geophys. Res.: Planets, 140, e2024JE008715
  15. Affholder, A. et al. incl. Melwani Daswani, M. (2025). The viability of glycine fermentation in Titan's subsurface ocean. Planet. Sci. J., 6, 86
  16. Lesage, E. et al. incl. Melwani Daswani, M. (2025). Signatures of past and present cryovolcanism on Europa: composition, geology, interior. Nat. Commun., 16, 1886
  17. Petricca, F. et al. incl. Melwani Daswani, M. (2025). Partial differentiation of Europa inferred from Galileo gravity data. Nat. Astron.
  18. Pou, L. et al. incl. Melwani Daswani, M. (2024). Tidal seismicity in the Moon and implications for the rocky interior of Europa. Planet. Sci. J., 5, 142
  19. Chua, B. H. et al. incl. Melwani Daswani, M. (2023). Low-temperature specific heat capacity of water–ammonia mixtures down to the eutectic. ACS Earth Space Chem., 7, 1971–1979
  20. Courville, S. W. et al. incl. Melwani Daswani, M. (2023). Timing and abundance of clathrate formation control ocean evolution in outer solar system bodies: challenges of maintaining a thick ocean within Pluto. Planet. Sci. J., 4, 179
  21. Styczinski, M. J., Vance, S. D. & Melwani Daswani, M. (2023). PlanetProfile: self-consistent interior structure modeling for ocean worlds and rocky dwarf planets in Python. Earth Space Sci., 10, e2022EA002748
  22. Naseem, M. et al. incl. Melwani Daswani, M. (2023). Salt distribution from freezing intrusions in ice shells on ocean worlds: application to Europa. Planet. Sci. J., 4, 181
  23. Castillo-Rogez, J. C. et al. incl. Melwani Daswani, M. (2023). Compositions and interior structures of the large moons of Uranus and implications for future spacecraft observations. J. Geophys. Res.: Planets, 128, e2022JE007432
  24. Diab, J., Melwani Daswani, M. & Castillo-Rogez, J. (2023). Bulk composition and thermal evolution constrain the formation of organics in Ceres' subsurface ocean via geochemical modeling. Icarus, 391, 115339
  25. Castillo-Rogez, J. C., Melwani Daswani, M. et al. (2022). Contribution of non-water ices to salinity and electrical conductivity in ocean worlds. Geophys. Res. Lett., 49, e2021GL097256
  26. Melwani Daswani, M. & Castillo-Rogez, J. C. (2022). Porosity-filling metamorphic brines explain Ceres' low mantle density. Planet. Sci. J., 3, 21
  27. Castillo-Rogez, J. C. et al. incl. Melwani Daswani, M. (2022). Science drivers for the future exploration of Ceres: from solar system evolution to ocean world science. Planet. Sci. J., 3, 64
  28. Marusiak, A. G. et al. incl. Melwani Daswani, M. (2021). Exploration of icy ocean worlds using geophysical approaches. Planet. Sci. J., 2, 150
  29. Melwani Daswani, M. et al. (2021). A metamorphic origin for Europa's ocean. Geophys. Res. Lett., 48, e2021GL094143
  30. Běhounková, M. et al. incl. Melwani Daswani, M. (2021). Tidally-induced magmatic pulses on the oceanic floor of Jupiter's moon Europa. Geophys. Res. Lett., 48, e2020GL090077
  31. Perl, S. M. et al. incl. Melwani Daswani, M. (2021). A proposed geobiology-driven nomenclature for astrobiological in situ observations and sample analyses. Astrobiology, 21, 954–967
  32. Morlok, A. et al. incl. Melwani Daswani, M. (2020). Mid-infrared reflectance spectroscopy of carbonaceous chondrites and calcium–aluminum-rich inclusions. Planet. Space Sci., 193, 105078
  33. Vance, S. D. & Melwani Daswani, M. (2020). Serpentinite and the search for life beyond Earth. Phil. Trans. R. Soc. A, 378, 20180421
  34. Kite, E. S. & Melwani Daswani, M. (2019). Geochemistry constrains global hydrology on early Mars. Earth Planet. Sci. Lett., 524, 115718
  35. Melwani Daswani, M. & Kite, E. S. (2017). Paleohydrology constrained by mass balance and mineralogy of pre-Amazonian sodium chloride lakes on Mars. J. Geophys. Res.: Planets, 122, 1802–1823
  36. Melwani Daswani, M. et al. (2016). Alteration minerals, fluids, and gases on early Mars: predictions from 1-D flow geochemical modeling of mineral assemblages in meteorite ALH 84001. Meteorit. Planet. Sci., 51, 2154–2174
  37. Gross, J. et al. incl. Melwani Daswani, M. (2013). Petrography, mineral chemistry, and crystallization history of olivine-phyric shergottite NWA 6234: a new melt composition. Meteorit. Planet. Sci., 48, 854–871

Also

  1. Chan, A., Melwani Daswani, M. & Vance, S. (2021). DEWPython: a Python implementation of the Deep Earth Water model and application to ocean worlds. arXiv:2105.14096
  2. Vance, S. D., Crósta, A. P., Melwani Daswani, M. et al. (2025). Exchange processes between surface, atmosphere, and interior (Chapter 13). Titan After Cassini-Huygens (Elsevier)
  3. Co-author on four Community Papers, and co-signee on three more, for the National Academies' Planetary Science and Astrobiology Decadal Survey 2023–2032.