78 citations · 154 across the 23 of their papers we have counts for
24 papers
Probing Exoplanetary Chemistry with Ariel: Scientific Priorities and Observational Strategies
Olivia Venot, Yamila Miguel, Robin Baeyens +30
Over the past two decades, increasingly precise observations have revealed that exoplanet atmospheres are chemically diverse and often far from equilibrium, with processes such as…
Super-Earth Interiors Shrink by About 10% as They Crystallise
Tim Lichtenberg, Mara Attia, Harrison Nicholls +26
Super-Earth exoplanets are among the most abundant planets known, yet their bulk densities leave the interior state degenerate. The static structure models used to interpret them,…
Evolutionary pathways toward survival of a thick CO2- or SO2-rich atmosphere on the lava world TOI-561 b
Emma Postolec, Tim Lichtenberg, Johanna K. Teske +10
Rocky planets evolve through the exchange of volatiles between their interiors and atmospheres, an interplay still poorly constrained by observations. Remarkably, highly irradiated…
A Highly Reflective Atmosphere on the Lava World TOI-561b Revealed by JWST/NIRSpec Phase Curve
Samuel Boucher, Lisa Dang, Alex McGinty +15
Ultra-short period (USP) rocky planets are expected to be depleted of any substantial gaseous envelope due to the intense irradiation they receive from their host star, making the…
Constraining the lives and times of exoplanets through evolutionary Bayesian retrievals
Harrison Nicholls, Tim Lichtenberg, Ben Riegler +2
Static retrieval frameworks are leading tools for interpreting exoplanet observations, yet time-independent modelling leaves them prone to degeneracy and unable to resolve exoplane…
Sulfur photochemistry observationally traces mantle redox states of rocky planets
Ioannis Panagiotou, Tim Lichtenberg, Shang-Min Tsai +1
Volatile outgassing from planetary interiors controls the composition of rocky exoplanets' secondary atmospheres. However, observations indicate that disequilibrium processes, such…
Atmospheric evolution through outgassing and escape on young molten rocky exoplanets
Emma Postolec, Tim Lichtenberg, Harrison Nicholls +2
The earliest rocky planet atmospheres are shaped by competition between initial volatile inventories and atmospheric escape. On young magma ocean planets, outgassing competes with…
Reflation: redox-driven atmospheric inflation as tracer of super-Earth geochemistry
Lorenzo Cesario, Tim Lichtenberg, Mara Attia +3
We demonstrate that the redox-sensitivity of mantle outgassing can trigger transient episodes of atmospheric re-inflation in highly irradiated and geochemically-reduced super-Earth…
Coupled atmospHere Interior modeL Intercomparison (CHILI). I. Evolutionary Modelling -- Primordial Magma Oceans of Earth and Venus
Harrison Nicholls, Joshua Krissansen-Totton, Tim Lichtenberg +22
Earth and Venus represent two evolutionary outcomes arising from initially molten 'magma ocean' periods, followed by lifetimes of chemical and geophysical divergence. Their physics…
Geophysical and atmospheric implications of O-dependent melting on rocky exoplanets
Mariana Sastre, Tim Lichtenberg, Laurent Soucasse +3
The geochemical evolution of long-lived magma oceans is strongly regulated by volatile exchange between the molten mantle and the atmosphere. For planets inside the runaway-greenho…
Equifinality of Venus-like CO Atmospheres
Tereza Constantinou, Oliver Shorttle, Harrison Nicholls
While Earth locks much of its carbon in its crust as carbonates, Venus retains a comparable carbon inventory almost entirely in its atmosphere as CO. On Earth, the geological c…
Beyond the mass-radius plane: Integrated radiative-convective and interior structure simulations of the exoplanet continuum
Harrison Nicholls, Oliver Shorttle, Tim Lichtenberg +1
Static structure models, which map mass-radius constraints to bulk planet composition, are frequently used to categorise exoplanets due to their computational efficiency and the hi…
Mantle Convection and Nightside Volcanism on Lava World K2-141 b
Tobias G. Meier, Claire Marie Guimond, Raymond T. Pierrehumbert +13
Ultra-short period lava worlds offer a unique window into the coupled evolution of planetary interior and atmospheres under extreme irradiation. In this study, we investigate the m…
Most Rocky Sub-Neptunes are Molten: Mapping the Solidification Shoreline for Gas Dwarf Exoplanets
Robb Calder, Oliver Shorttle, Harrison Nicholls +2
Sub-Neptunes are the most common type of detected exoplanet, yet their observed masses and radii are degenerate with several interior structures. One possibility is that sub-Neptun…
Coupled atmospHere Interior modeL Intercomparison (CHILI) Protocol Version 1.0: A CUISINES Intercomparison Project of Magma Ocean Models
Tim Lichtenberg, Laura Schaefer, Joshua Krissansen-Totton +23
Spectroscopic characterization of rocky exoplanets with the James Webb Space Telescope has brought the origin and evolution of their atmospheres into the focus of exoplanet science…
Onset of habitable conditions on the Hadean Earth set by feedback between tides and greenhouse forcing
Marijn R. van Dijk, Harrison Nicholls, Tim Lichtenberg
In the aftermath of the Moon-forming giant impact, the Hadean Earth's mantle and surface crystallized from a global magma ocean blanketed by a dense volatile-rich atmosphere. While…
Volatile-rich evolution of molten super-Earth L 98-59 d
Harrison Nicholls, Tim Lichtenberg, Richard D. Chatterjee +3
Small low-density exoplanets are sculpted by strong stellar irradiation, but their primordial compositions and subsequent evolution are still unknown. Two often-considered scenario…
AGNI: A radiative-convective model for lava planet atmospheres
Harrison Nicholls, Raymond Pierrehumbert, Tim Lichtenberg
It is important that we are able to accurately model the atmospheres of (exo)planets. This is because atmospheres play a central role in setting a planet's thermochemical environme…
Absence of a Runaway Greenhouse Limit on Lava Planets
Iris D. Boer, Harrison Nicholls, Tim Lichtenberg
Climate transitions on exoplanets offer valuable insights into the atmospheric processes governing planetary habitability. Previous pure-steam atmospheric models show a thermal lim…
Self-limited tidal heating and prolonged magma oceans in the L 98-59 system
Harrison Nicholls, Claire Marie Guimond, Hamish C. F. C. Hay +3
Rocky exoplanets accessible to characterisation often lie on close-in orbits where tidal heating within their interiors is significant, with the L 98-59 planetary system being a pr…
Convective shutdown in the atmospheres of lava worlds
Harrison Nicholls, Raymond T. Pierrehumbert, Tim Lichtenberg +2
Atmospheric energy transport is central to the cooling of primordial magma oceans. Theoretical studies of atmospheres on lava planets have assumed that convection is the only proce…
Magma ocean evolution at arbitrary redox state
Harrison Nicholls, Tim Lichtenberg, Dan J. Bower +1
Interactions between magma oceans and overlying atmospheres on young rocky planets leads to an evolving feedback of outgassing, greenhouse forcing, and mantle melt fraction. Previo…
Reliable Detections of Atmospheres on Rocky Exoplanets with Photometric JWST Phase Curves
Mark Hammond, Claire Marie Guimond, Tim Lichtenberg +9
The prevalence of atmospheres on rocky planets is one of the major questions in exoplanet astronomy, but there are currently no published unambiguous detections of atmospheres on a…
Distinguishing oceans of water from magma on mini-Neptune K2-18b
Oliver Shorttle, Sean Jordan, Harrison Nicholls +2
Mildly irradiated mini-Neptunes have densities potentially consistent with them hosting substantial liquid water oceans (`Hycean' planets). The presence of CO2 and simultaneous abs…