First statistically significant detection of dayside silicate clouds on a Neptunian-mass exoplanet, with CO and CO2 detections and C/O ratio of 0.984 from JWST spectra.
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JWST MIRI/LRS data combined with archival observations detect magnesium silicate clouds (likely Mg2SiO4) in HD 209458b at 1-10 mbar with ~0.1 micron particles using a new rule-based data reduction approach.
JWST NIRSpec observations of LTT 1445 A b yield a featureless 3-5μm transmission spectrum, limiting atmospheric metallicity to ≳350× solar under grey-cloud models.
JWST data on NGTS-10A b shows nightside CH4 depletion caused by day-to-night horizontal transport rather than vertical mixing or non-solar abundances.
Joint speckle-atmosphere retrievals on JWST spectra of HD 19467 B and a field T dwarf detect H2O, CH4, CO, CO2 and NH3, yield carbon isotopic ratios of 154 and 85 respectively, and show near-solar metallicity with subsolar C/O.
The atmosphere of TOI-1130b shows high metallicity, low C/O, and elevated mean molecular weight consistent with ex-situ formation beyond the water ice line.
Panchromatic JWST spectrum of WASP-121 b detects SiO and measures refractory-to-volatile ratios 3x stellar, consistent with mixed solid-gas accretion or migration with continued solid accretion.
JWST/NIRCam observations of 2024 YR4 extend the orbital arc by eight months, reduce 2032 lunar encounter uncertainty by >30x, and rule out impact with a 22,900 ± 800 km miss distance.
Accounting for stellar and orbital uncertainties shows that predicted eclipse depths for bare-rock models of rocky exoplanets carry substantial uncertainty comparable to measurements, establishing a fundamental precision limit for atmospheric and compositional inferences.
J0404+1112 is a 2.93 hr period totally eclipsing WD+BD system with a hot DA white dwarf (T_eff ~28,000 K) and ~40 M_Jup brown dwarf, enabling isolation of nightside emission and serving as a JWST atmospheric benchmark.
JWST eclipse data show HD 3167 b has a cooler dayside than a bare rock, indicating an atmosphere on this least-irradiated USP super-Earth with such evidence.
WASP-96b shows super-solar metallicity of 2-6x stellar, roughly stellar C/O, tentative SO2 consistent with photochemistry, and an optical slope from scattering aerosols, supporting core-accretion formation beyond the water snowline.
Complete four-observation JWST dataset for GJ 3929 b yields 118±22 ppm eclipse depth, consistent with bare rock while allowing thin atmospheres and ruling out only thick CO2 cases at >3σ.
New transit observations of WASP-43 b yield no evidence of orbital decay while revealing major challenges in combining multi-instrument data for atmospheric retrievals.
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