Gemini-South telescope Archives

Additional analysis for the tentative cross-correlation signal observed for H2S. We show the cross-correlation S/N as a function of the orbital parameters of the planet. In each case, the expected parameters are marked with crosshairs. Left: The S/N is shown as a function of planetary velocity space, parameterised by 𝐾p and 𝑉sys, reproduced from the top panel of Figure 3 but with a more zoomed in colorscale. A tentative peak with a S/N of 1.7 is observed at the expected systemic velocity. Right: the time duration of the observed H2S cross-correlation signal is constrained with a value that is consistent with the literature value for the transit duration of the planet. This is measured by varying the number of spectra considered to be in-transit (𝑁in) when calculating the cross-correlation S/N, with 𝐾p fixed to that expected for this planet. -- astro-ph.EP

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

Ground-based Atmospheric Characterization of Super-Earth L 98-59 d at High Spectral Resolution

by Keith CowingMarch 8, 2026March 8, 2026

Atmospheric characterization of exoplanets using ground-based high-resolution transmission spectroscopy has traditionally focussed on large and close-in planets, such as hot Jupiters.

Gemini-South telescope

Ground-based Atmospheric Characterization of Super-Earth L 98-59 d at High Spectral Resolution

Astrobiologist Dale Andersen’s Antarctic Field Report: 9 November 2026: Lake Untersee Basecamp Update

From Anoxic to Oxic Earth: Detectability of Atmospheric Biosignatures Across Stellar Hosts with ELT/ANDES

The Kinetic Basis of the Genetic Code

Power Density as a Universal Biosignature: An Application to the Stellivore Hypothesis

The Limits of Tidal Circularization and Atmospheric Escape for Mini-Neptunes and Super-Earths: The Case of TOI-2257 b