T-dwarf Archives

Opacities of molecules in our best-fit model, with abundances matching the best-fit value (for H2O, CH4, NH3, HCN and C2H2) and 2σ upper limits (for CO and CO2) from our best-fit model. Opacities in the upper panel are at R=100 and in the lower panel are at R=1000 (matching the resolution used in our pRT retrievals). In the lower panel we highlight the regions where HCN and C2H2 absorb most strongly in the near- and mid-IR. For the WISE-0458 abundances, both species are only detectable in the mid-IR around 14 µm in the WISE-0458 atmosphere. With sufficiently high abundances (higher than those observed here), both species might become detectable in the near-IR, at 3 µm and 1.5 µm. -- astro-ph.EP

Astrochemistry, Astronomy & Telescopes, Atmospheres, Climate, Weather, Brown Dwarfs, Imaging & Spectroscopy, Status Report

HCN And C2H2 In The Atmosphere Of A T8.5+T9 Brown Dwarf binary

by Keith CowingFebruary 24, 2025February 24, 2025

T-type brown dwarfs present an opportunity to explore atmospheres teeming with molecules such as H2O, CH4 and NH3, which exhibit a wealth of absorption features in the mid-infrared. With JWST, […]

T-dwarf

HCN And C2H2 In The Atmosphere Of A T8.5+T9 Brown Dwarf binary

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Complex Organic Molecules in Protostars with ALMA Spectral Surveys (COMPASS) II. Approach To Data Reduction And Products For Line-rich Broadband (sub)millimeter Spectra