Tag: #jwst

Webb Detects Methane in Interstellar Comet 3I/ATLAS

NASA’s James Webb made the first direct detection of methane in an interstellar object, finding CH4 plus CO2 and water in comet 3I/ATLAS.

#jwst, #interstellar, #comets, #methane

JADES releases uniformly modeled catalog of about 500,000 galaxies in GOODS deep fields

JADES DR5 offers a uniform Bayesian catalog of stellar mass, SFR, metallicity and AGN contribution for about 500,000 sources in GOODS-N and GOODS-S.

#jwst, #jades, #galaxies, #astronomy

Preprint: JWST spectra of K2-18b still consistent with Hycean ocean‑world models

A May 18 arXiv preprint finds JWST transmission spectra of K2-18b can be reproduced by self-consistent Hycean (H2‑rich ocean) atmosphere models without invoking DMS.

#exoplanets, #jwst, #hycean, #k2-18b

JWST Mid‑Infrared Spectrum Indicates Basaltic Surface, Little Atmosphere on Rocky Exoplanet LHS 3844 b

JWST mid-infrared observations of LHS 3844 b point to a dark, low-silica (basaltic) surface and rule out a thick CO2 or SO2 atmosphere.

#astronomy, #exoplanets, #jwst, #surfacecomposition

JWST and Lensing Reveal Abundant Ultra-Faint Galaxies, Bolstering the Case They Powered Reionization

JWST + lensing study finds abundant ultra-faint galaxies at z≈6–9 with no turnover down to MUV≈−12, bolstering the case that faint galaxies powered reionization.

#astronomy, #jwst, #reionization, #galaxies

Wide JWST Survey Finds Fewer Galaxies at z≈10, Bringing Counts Closer to Spectroscopy

A 36-sightline JWST NIRCam survey reports lower galaxy counts near redshift 10 than earlier photometric studies, aligning better with spectroscopic results.

#jwst, #astronomy, #galaxies, #cosmology

JWST data suggest powerful galactic wind 300 million years after the Big Bang

JWST spectra show extended CIII] around a z≈14 galaxy, implying strong, metal‑rich outflows moved gas 300 million years after the Big Bang.

#astronomy, #jwst, #galaxies, #cosmicdawn

Oven-Hot Exoplanet Near ‘Radius Valley’ Shows How Stars Strip Worlds Bare

TOI-5734 b is a dense, Neptune-size world losing its atmosphere under fierce radiation—an ideal test case for models of planetary erosion.

#exoplanets, #astronomy, #tess, #jwst, #planetaryscience