Tag: #jwst

TDCOSMO measures H0 at 71.1 km/s/Mpc with 3.3% uncertainty using strong lensing and JWST kinematics

TDCOSMO uses time-delay lensing and resolved stellar kinematics (including JWST) to measure H0 = 71.1 km/s/Mpc ±3.3%, an independent late‑Universe check.

#cosmology, #hubbleconstant, #stronglensing, #jwst

Candidate tidal disruption event spotted in quasar 700 million years after Big Bang

Astronomers report a candidate tidal disruption event in GNz7q, a dusty quasar at z=7.19, reconstructed from Hubble, Spitzer and JWST — a rare early‑universe glimpse.

#tidaldisruption, #blackhole, #quasar, #jwst, #astrophysics

Deeper X‑ray and JWST Data Cast Doubt on Claimed Black Hole in Galaxy UHZ1

Deep Chandra and JWST reanalysis finds no solid X‑ray or mid‑IR evidence that galaxy UHZ1 (z=10.05) hosts the luminous, obscured black hole claimed in 2023.

#astronomy, #black-holes, #jwst, #chandra

JWST detects hydrocarbons, aerosols and excess heat in atmosphere of white-dwarf planet WD 1856 b

Nature paper reports JWST transmission spectrum of WD 1856 b, revealing hydrocarbons, aerosols and unexpected warmth — the first atmospheric probe of a white-dwarf planet.

#jwst, #exoplanets, #white-dwarf, #astronomy

JADES Finds Candidate Galaxy Overdensity at z ≈ 10.5 in the First 500 Million Years

JADES reports a candidate concentration of 18 galaxies at z≈10.5 in GOODS‑S, an unusually dense patch in the first 500 Myr that needs spectroscopic confirmation.

#jwst, #jades, #galaxies, #cosmicdawn

Preprint: JWST spectra suggest carbon disulfide in atmosphere of young exoplanet V1298 Tau e

A new arXiv preprint reports JWST detected carbon disulfide (CS2) in the atmosphere of young exoplanet V1298 Tau e — a result under review that needs confirmation.

#exoplanets, #jwst, #astronomy, #sulfur

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