Wide Field Camera 3 Archives

The near-infrared transmission spectrum of HD 219666 b observed over two visits with HST/WFC3 G141. The spectra derived from each individual visit are shown as the gray diamond and square points, with a uniform 205 ppm offset applied to all points from the second visit. The error-weighted average of our two visits is shown as the black points, and the median retrieved model spectrum is shown as the green line with its 1- and 2-σ uncertainties represented by the green shaded regions. -- astro-ph.EP

Astronomy & Telescopes, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

HST Transmission Spectra Of The Hot-Neptune HD 219666 b: Detection Of Water And The Challenge Of Constraining Both Water And Methane With HST

by Keith CowingMarch 18, 2025March 18, 2025

Although Neptunian-sized (2 – 5 REarth) planets appear to be extremely common in the Galaxy, many mysteries remain about their overall nature. To date, only eleven Neptunian-sized planets have had […]

Posterior distributions of the reference planet radius 𝑅p, water abundance 𝑋H2O, and temperature 𝑇 retrieved using fixed or variable values of the stellar radius (𝑅p) and planetary surface gravity (log 𝑔p) for HD 209458b. Cloud free (blue) and grey cloud (yellow) models were tested. -- astro-ph.EP

Astronomy & Telescopes, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

Parameter Degeneracies Associated With Interpreting HST WFC3 Transmission Spectra Of Exoplanetary Atmospheres

by Keith CowingMarch 14, 2025March 14, 2025

The Wide Field Camera 3 (WFC3) instrument on the Hubble Space Telescope has provided an abundance of exoplanet spectra over the years. These spectra have enabled analysis studies using atmospheric […]