26 citations · 93 across the 10 of their papers we have counts for
12 papers · 1 filter
The influence of composition gradients on giant planet radii
Henrik Knierim, Ravit Helled
The radius of a giant planet is a key physical property. It encapsulates the outcome of its mass, composition, and thermal state, serving as a critical link between observations an…
Further constraints on Jupiter's primordial structure
Henrik Knierim, Konstantin Batygin, Ravit Helled +2
The primordial structure of Jupiter remains uncertain, yet it holds vital clues on the planet's formation and early evolution. Recent work used dynamical constraints from Jupiter's…
Giant Planet Evolution with MESA
Ravit Helled, Simon Müller, Henrik Knierim
The evolution of gaseous planets is a complex process influenced by various physical parameters and processes. In this study, we present critical modifications to the Modules for E…
The TOI-1117 Multi-planetary System: 3 sub-Neptunes, 1 in both the Neptunian Desert and Radius Valley
Isobel S. Lockley, David J. Armstrong, Jorge Fernández Fernández +33
We present the discovery of three sub-Neptune planets around TOI-1117, a Sun-like star with mass , radius , age Gyr and ef…
Unraveling the origin of giant exoplanets: Observational implications of convective mixing
Henrik Knierim, Ravit Helled
The connection between the atmospheric composition of giant planets and their origin remains elusive. In this study, we explore how convective mixing can link the primordial planet…
Convective Mixing in Gas Giant Planets with Primordial Composition Gradients
Henrik Knierim, Ravit Helled
Linking atmospheric measurements to the bulk planetary composition and ultimately the planetary origin is a key objective in planetary science. In this work, we identify the cases…
Discovery of a cold giant planet and mass measurement of a hot super-Earth in the multi-planetary system WASP-132
N. Grieves, F. Bouchy, D. J. Armstrong +25
Hot Jupiters generally do not have nearby planet companions, as they may have cleared out other planets during their inward migration from more distant orbits. This gives evidence…
Discovery of two warm mini-Neptunes with contrasting densities orbiting the young K3V star TOI-815
Angelica Psaridi, Hugh Osborn, François Bouchy +130
We present the discovery and characterization of two warm mini-Neptunes transiting the K3V star TOI-815 in a K-M binary system. Analysis of the spectra and rotation period reveal i…
TOI-332 b: a super dense Neptune found deep within the Neptunian desert
Ares Osborn, David J. Armstrong, Jorge Fernández Fernández +49
To date, thousands of planets have been discovered, but there are regions of the orbital parameter space that are still bare. An example is the short period and intermediate mass/r…
Discovery and characterisation of two Neptune-mass planets orbiting HD 212729 with TESS
David J. Armstrong, Ares Osborn, Vardan Adibekyan +33
We report the discovery of two exoplanets orbiting around HD 212729 (TOI\,1052, TIC 317060587), a K star with V=9.51 observed by TESS in Sectors 1 and 13. One exo…
Constraining the origin of giant exoplanets via elemental abundance measurements
Henrik Knierim, Sho Shibata, Ravit Helled
The origin of close-in giant planets is a key open question in planet formation theory. The two leading models are (i) formation at the outer disk followed by migration and (ii) in…
Shallowness of circulation in hot Jupiters -- Advancing the Ohmic dissipation model
Henrik Knierim, Konstantin Batygin, Bertram Bitsch
The inflated radii of giant short-period extrasolar planets collectively indicate that the interiors of hot Jupiters are heated by some anomalous energy dissipation mechanism. Alth…