GJ 3470 b Archives - Astrobiology

Corner plot from the Full (left) and Upper Limits (right) Runs with associated CCF maps for TOI-1807 b.

Astrochemistry, Astrogeology, Astronomy & Telescopes, Atmospheres, Climate, Weather, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

Searching For Molecular Signatures In 14 Transiting Exoplanets With SPIRou

by Keith CowingMarch 19, 2026March 19, 2026

High-resolution spectroscopy provides unique constraints on exoplanet atmospheric composition and dynamics. The past decade of ground-based campaigns has accumulated extensive public archives, yet many observations remain unanalysed.

The sweep of Twinkle’s FOR and location of currently known exoplanets (red) and TESS objects of interest (blue). -- astro-ph.IM

Astronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Missions & Hardware, Press Release

Atmospheric Characterisation With The Twinkle Space Telescope Following Advances From JWST Observations

by Keith CowingAugust 15, 2025August 15, 2025

The Twinkle Space Telescope is a satellite designed for spectroscopic observations of a wide range of extrasolar and solar system objects.

Stellar surface intensity map at 1083.31nm computed with PYSME in the case of HAT-P-11 b. The intensity map is relative to the integrated intensity over the stellar map at 1083.31nm. The grid contains 101x101 cells, and the planet’s trajectory is shown with a red solid line with black dots indicating the planet’s center at each observed phase. The planet solid disk is shown at a given phase, with the underlying stellar cells being excluded from the master spectrum computation. -- astro-ph.EP

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

Probing Atmospheric Escape Through Metastable He I Triplet Lines In 15 Exoplanets Observed With SPIRou

by Keith CowingJune 14, 2024June 14, 2024

For several years, the metastable helium triplet line has been successfully used as a tracer to probe atmospheric escape in transiting exoplanets. This absorption in the near-infrared (1083.3 nm) can […]

The sulfur-laden atmosphere discovered on gaseous exoplanet GJ 3470 b, show here in an illustration orbiting its star in the constellation Cancer, could help researchers figure out how it (and similar planets) were formed. Image: Department of Astronomy, UW–Madison

Astrochemistry, Astrogeology, Astronomy & Telescopes, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Press Release

Small, Cool And Sulfurous Exoplanet May Help Write The Recipe For Planetary Formation

by Keith CowingJune 11, 2024June 11, 2024

A surprising yellow haze of sulfur dioxide in the atmosphere of a gas “dwarf” exoplanet about 96 light years away from our own solar system makes the planet a prime […]

Three independent reductions of the NIRCam F322W2 and F444W data agree within their uncertainties The top panel shows the F322W2 and F444W transmission spectra, as reduced using the Pegasus, Eureka, and tshirt pipelines, plotted with their associated 1 σ uncertainties using constant 0.015µm-wide spectral bins. All of the F322W2 spectra have been offset down by 163 ppm to correct for a bias offset in the F322W2 transit depths compared to the F444W and Spitzer data (see Appendix B.3). All three reductions agree on the shape of the transmission spectrum and show features due to H2O (2.5–3.2µm), CH4 (3.2–3.5µm), SO2 (3.9–4.1µm), and CO2 (2.6–2.9µm and 4.2–4.5µm). The absorption cross sections of the prominent species in this wavelength range, many of which are visually identifiable in the bottom panel. -- astro-ph.EP

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

Sulfur Dioxide and Other Molecular Species in the Atmosphere of the Sub-Neptune GJ 3470 b

by Keith CowingJune 11, 2024June 11, 2024

We report observations of the atmospheric transmission spectrum of the sub-Neptune exoplanet GJ 3470 b taken using the Near-Infrared Camera (NIRCam) on JWST. Combined with two archival HST/WFC3 transit observations […]

SVD/PCA based detrending process and the effect of model reprocessing for order number 11 of Night 1 of CARMENES observation. (a) Data after calibration through CARACAL, (b) After SVD/PCA based detrending and strong residual masking - the orange line shows the cross-section along which the spectra for (e) is drawn, (c) Nominal exoplanet model signal that is to be injected into noiseless data matrix before reprocessing - the black line represents the cross-section for drawing the spectrum in (f), (d) Reprocessed model signal showing the model signal + artefacts in the out-of-transit phases - blue is the cross-section for drawing (g) and reddish brown for (h), (e) Cross-section at mid-transit time (Phase = 0) for the processed and normalised data in (b) showing variations around 1.0, (f) Same as (e) but for the nominal model signal in (c), (g) Same as (e) but for the reprocessed model signal in (d). The differences between (f) and (g) notably in the line depths and wing shapes illustrate the effect of the SVD/PCA based detrending procedure on the the model signal and by definition any actual signal that would be present in the data, (h) Cross-section at an out-of-transit time (Phase ≈ 0.02) showcasing the nature of the artefacts caused due to model reprocessing with a similar scale as in (g). -- astro-ph.EP

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

Constraints On Atmospheric Water Abundance and Cloud Deck Pressure in the Warm Neptune GJ 3470 b via CARMENES Transmission Spectroscopy

by Keith CowingApril 11, 2024April 11, 2024

Observations of cooler atmospheres of super-Earths and Neptune sized objects often show flat transmission spectra.