GJ 357 b Archives

The atmospheric compositions ruled out by the Tiberius dataset binned at 60 pixels.

Astronomy & Telescopes, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

JWST COMPASS: A NIRSpec G395H Transmission Spectrum Of The Super-Earth GJ 357 b

by Keith CowingJuly 12, 2025July 12, 2025

We present JWST NIRSpec/G395H transmission spectroscopy observations of GJ 357 b, a warm (Teq≈525 K) super-Earth (1.2 R⊕, 1.84 M⊕) orbiting a nearby M3-type star, with a median precision of […]

GJ 357 b NIRISS white light curve fit results. Top panel: Raw GJ 357 b order 1 white light curve, with the best-fitting astrophysical transit + systematics model overplotted in black. The first ∼40% of the transit was missed by our observation. Integrations from ∼0.8 – 1.5 hr post-transit mid-point (shown as faded) were excluded from the fit due to uncorrectable systematics. Second panel: Systematics corrected white light curve, with the best-fitting astrophysical model overplotted in black. Third panel: Residuals to the light curve fit. Some correlated noise remains in the post-transit baseline which is not adequately captured by our systematics model. Bottom panel: Histogram of residuals. -- astro-ph.EP

Astronomy & Telescopes, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

JWST NIRISS Transmission Spectroscopy of the Super-Earth GJ 357b, a Favourable Target for Atmospheric Retention

by Keith CowingJune 2, 2025June 2, 2025

We present a JWST NIRISS/SOSS transmission spectrum of the super-Earth GJ 357 b: the first atmospheric observation of this exoplanet.

GJ 357 b

JWST COMPASS: A NIRSpec G395H Transmission Spectrum Of The Super-Earth GJ 357 b

JWST NIRISS Transmission Spectroscopy of the Super-Earth GJ 357b, a Favourable Target for Atmospheric Retention

NASA Establishes Mars Forward Operational Risk and Contamination Evaluation (M-FORCE) Tiger Team to Shape Mars Planetary Protection Protocols

Opportunity to Contribute to NASA DARES Community White Paper on Phototrophic Biosignatures

The Search For Life Elsewhere: Avoiding Hype and Fostering Public Understanding

Panchromatic Spectra of Nearby Low-mass and Sun-like Stars with Directly Imageable Habitable Zones

Alfred: A Flexible, User-Friendly Python Package for Exoplanet Confirmation