NGC1333 Archives

New image from the James Webb Space Telescope spectroscopic survey of NGC1333. CREDIT ESA/Webb, NASA & CSA, A. Scholz, K. Muzic, A. Langeveld, R. Jayawardhana larger image

Astronomy & Telescopes, Brown Dwarfs, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Interstellar, Press Release, Stellar Cartography

In Six New Rogue Worlds, Webb Telescope Finds More Star Birth Clues

by Keith CowingAugust 28, 2024August 27, 2024

The James Webb Space Telescope has spotted six likely rogue worlds—objects with planetlike masses but untethered from any star’s gravity—including the lightest ever identified with a dusty disk around it.

Example of the background subtraction process applied to the calibrated slope image cutouts between Stage 2 and Stage 3 of the JWST Science Calibration Pipeline. Top panel: Cutout for one source showing the dispersion of the spectrum (central rows). Rows above and below the spectral trail have a purple hue indicative of the background, which increases in strength towards longer wavelengths. Bottom panel: Following background subtraction, the cutout now only shows significant flux from the source. The color scale is the same for both panels. Data inside the shaded regions are ignored when analyzing the 1D spectrum in the following analysis. White pixels are “NaN” values that do not affect the spectral extraction. -- astro-ph.EP

Astronomy & Telescopes, Brown Dwarfs, Exoplanets, -moons, -comets, Status Report, Stellar Cartography

The JWST/NIRISS Deep Spectroscopic Survey for Young Brown Dwarfs and Free-Floating Planets

by Keith CowingAugust 26, 2024August 26, 2024

The discovery and characterization of free-floating planetary-mass objects (FFPMOs) is fundamental to our understanding of star and planet formation. Here we report results from an extremely deep spectroscopic survey of […]