Josh Lothringer

@jlothringer.bsky.social

234 Followers 172 Following

Assistant Astronomer at @spacetelescope.bsky.social researching exoplanet and brown dwarf atmospheres. Opinions expressed are my own. https://jlothringer.github.io/

A plot of escape velocity versus XUV flux with some points from different planets as data points. Planets with Mg II escape appear above a trend line, while planets without Mg II escape appear below the trend line.
A spectrum (transit depth versus wavelength) showing two large bumps, which models and data agree is the Mg II absorption feature.
C/H versus planet mass, showing increasing metallicity towards smaller planet masses.
Planet metallicity versus equilibrium temperature.
Left: A plot of O/H versus sub-sample (direct spectroscopy, eclipse spectroscopy, etc.). Right: The same but C/O versus sub-sample. Transit spectroscopy shows low C/O.
A logo with text "ExoComp" with a robot scanning the "O".
Two histograms showing the posterior constrain on limb asymmetries in the white light curve and NUV spectrum. The NUV spectrum (0.2-0.4) appears to show positive evidence for a limb asymmetry.
Two plots showing the composition constraints from KELT-20b (O/H versus Z/H and C/O versus Z/H), alongside possible formation scenarios. KELT-20b, WASP-178b, and WASP-121b are all plotted as well. KELT-20b is consistent with the accretion of volatile-enriched gas and/or solids.
A plot of normalized spectra of various planets showing transit radius (normalized to the equilibrium scale height) versus wavelength. Planets above ~2000K appear to have large NUV absorption, while planets <2000K do not.
A plot of a spectrum of transit depth versus wavelength showing large NUV absorption and weak H2O absorption at NIR wavelengths.
Two transmission spectra from JWST (top) and HST+JWST (bottom) showing absorption from metals, H-, H2O, and CO