NIRISS Archives - Page 2 of 2 - Astrobiology

Haze (tholin and soot) models from Jacobs et al. (2023) for two metallicities: [M/H] = 0 (solid) and [M/H] = 1 (dashed). The various formation rates are shown in cool colors for the tholins and in warm colors for the soots. The haze models are compared to the NIRISS/SOSS eclipse spectrum of WASP-80 b. If the aerosols are hazes, they could consist of soots or tholins, with formation rates for tholins most likely lower than 10−11.5g cm−2 s−1. -- astro-ph.EP

Astrochemistry, Astronomy & Telescopes, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

A Moderate Albedo From Reflecting Aerosols On The Dayside Of WASP-80 b Revealed By JWST/NIRISS Eclipse Spectroscopy

by Keith CowingMarch 26, 2025March 26, 2025

Secondary eclipse observations of exoplanets at near-infrared wavelengths enable the detection of thermal emission and reflected stellar light, providing insights into the thermal structure and aerosol composition of their atmospheres.

Opacities as a function of wavelength for the opacity sources in the current study, computed at a temperature of 1000 K and a pressure of 0.01 bar. The opacities are weighted by their mass mixing ratios corresponding to the best-fit model from the non-isothermal + non-grey cloud retrieval on the NIRISS data. They are shown over the wavelength range covered by the three instruments in this study – NIRISS, WFC3 and STIS. -- astro-ph.EP

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

JWST/NIRISS and HST: Exploring The Improved Ability to Characterise Exoplanet Atmospheres In The JWST Era

by Keith CowingSeptember 26, 2024September 26, 2024

The Hubble Space Telescope has been a pioneering instrument for studying the atmospheres of exoplanets, specifically its WFC3 and STIS instruments. With the launch of JWST, we are able to […]

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.

Spectrophotometric transit fits of LHS 1140 b for visit 1 (UT2023-12-01, left) and visit 2 (UT2023-12-26, right) and LHS 1140 c for visit 2 only. The broadband (‘white’) light curves are shown in top panels with the best-fit full model (transit + systematics) shown in black and systematics component only in pink (scaled 10× for clarity). For both visits, examples of 10 systematics-corrected spectroscopic bins are depicted with colored points in bottom panels. -- astro-ph.EP

Astrochemistry, Astronomy & Telescopes, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report, TRAPPIST-1, Water/Hycean Worlds & Oceanography

Transmission Spectroscopy of the Habitable Zone Exoplanet LHS 1140 b with JWST/NIRISS

by Keith CowingJune 24, 2024June 24, 2024

LHS 1140 b is the second-closest temperate transiting planet to the Earth with an equilibrium temperature low enough to support surface liquid water.

Geometrical model fit to the F480M closure phase and squared visibility data of PDS 70 (images), using uniform priors on the positions of PDS 70 b and c. With respect to the central source (yellow star), PDS 70 b is to the south-east while PDS 70 c is directly west. The white contours denote the 1, 2, 3, 4 and 5 σ contours of the marginalized posterior of the positions of PDS 70 b and c. The two grey dashed circles are centered on the predicted locations of the planets at the time of the observations (Wang et al. 2021b) from whereistheplanet (Wang et al. 2021a). We mask the central region to denote the inner working angle of ∼0.5λ/B = 94 mas, the diffraction limit of the data. -- astro-ph.EP

Astronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

The James Webb Interferometer: Space-based Interferometric Detections of PDS 70 b and c at 4.8 μm

by Keith CowingApril 24, 2024April 24, 2024

We observed the planet-hosting system PDS 70 with the James Webb Interferometer, JWST’s Aperture Masking Interferometric (AMI) mode within NIRISS.

An artistic representation of the “hot Saturn” exoplanet, HAT-P-18 b. CREDIT NASA/Eyes on Exoplanets - NASA

Astrogeology, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Press Release, TRAPPIST-1

Hot Saturn Exoplanet HAT-P-18 b And Its Parent Star

by Keith CowingJanuary 11, 2024January 10, 2024

Led by researchers from Université de Montréal’s Trottier Institute for Research on Exoplanets (iREx), a team of astronomers has harnessed the power of the revolutionary James Webb Space Webb Telescope […]

dimethyl sulfide (DMS) -- Wikipedia

Astrochemistry, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report

Carbon-bearing Molecules In A Possible Hycean Atmosphere

by Keith CowingSeptember 17, 2023September 17, 2023

The search for habitable environments and biomarkers in exoplanetary atmospheres is the holy grail of exoplanet science. The detection of atmospheric signatures of habitable Earth-like exoplanets is challenging due to […]