ATMO Archives

Coronagraphic images of HD 95086 in each filter (F1065, F1140, and F2300) are shown in the top panel, followed by the same images after the subtraction of an optimized-reference star in the lower panel. The coronagraphic center is illustrated with the small star in blue. The inner disk, the planet, the background galaxies g and g2, and the background star s are labeled. For clarity, the color scale is enhanced for the bottom pannel at F1065C and F1140C, using an asinh scale. Units are in DN/s. -- astro-ph.EP

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

Unveiling the HD 95086 System at Mid-infrared Wavelengths with JWST/MIRI

by Keith CowingSeptember 4, 2024September 4, 2024

Mid-infrared imaging of exoplanets and disks is now possible with the coronagraphs of the MIRI on the JWST. This wavelength range unveils new features of young directly imaged systems and […]

Maps of the wavelength dependent optical depth (on a log scale), with optical depths of 0.1, 1.0 and 10 indicated by dotted/solid/dashed line respectively. We compare the optical depth profiles for an R=10 km, ρ =2 g cm−3 , JWST Ice ver. A cometary composition impact at three different points in time, 1 year (A), 5 years (C), and 25 years (C - steady-state) after impact, with our unperturbed HD209458b reference model (D). To emphasise how the opacity of the atmosphere varies time we also include, on our steady-state opacity map, the 1 year (green), 5 year (blue), 25 year (red) and reference (orange) τ = 1 surfaces as light shading. Note the significant effect that the addition of cometary material has had on the optical depth, in particular how an optical depth of one is reached at lower pressures, averaging ∼ 10−2 bar at steady-state vs ∼ 10−1 bar in the unperturbed model, helping to explain the difference in the transmission spectra seen in Figure 8. -- astro-ph.EP

Comets and Asteroids, Exoplanets, -moons, -comets, Gas Giants, Imaging & Spectroscopy, Impact events, Jupiter, Status Report

The Impact Of Cometary Impacts On The Chemistry, Climate, And Spectra Of Hot Jupiter Atmospheres

by Keith CowingFebruary 9, 2024February 9, 2024

Impacts from icy and rocky bodies have helped shape the composition of solar system objects, for example the Earth-Moon system, or the recent impact of comet Shoemaker-Levy 9 with Jupiter. […]