"For the study, the researchers examined the atmospheres of what are known as exoVenuses, which are exoplanets that lie within the Venus Zone (VZ), or inside the runaway greenhouse boundary of their parent star's orbit. Astronomers hope to use exoVenus atmospheres as analogs to not only better understand the runaway greenhouse effect of Venus, but its past, as well."
My notes. I read several reports recently on the VZ. Here are some examples.
Hunting Venus 2.0: Study narrows James Webb Space Telescope targets, https://phys.org/news/2023-03-venus-narrows-james-webb-space.html
ref - The Demographics of Terrestrial Planets in the Venus Zone, https://iopscience.iop.org/article/10.3847/1538-3881/acbfaf
, 21-March-2023. "Abstract Understanding the physical characteristics of Venus, including its atmosphere, interior, and its evolutionary pathway with respect to Earth, remains a vital component for terrestrial planet evolution models and the emergence and/or decline of planetary habitability."
This forums discussion on Venus was interesting. NASA scientist explains why Venus is Earth's 'evil twin' (video), https://forums.space.com/threads/nasa-scientist-explains-why-venus-is-earths-evil-twin-video.59691/
GJ 3929: High Precision Photometric and Doppler Characterization of an Exo-Venus and its Hot, Mini-Neptune-mass Companion, https://arxiv.org/abs/2207.10672
Now we have some recent reports where potential smaller, rocky exoplanets show no atmospheres.
James Webb Space Telescope finds no atmosphere on Earth-like TRAPPIST-1 exoplanet, https://forums.space.com/threads/ja...ere-on-earth-like-trappist-1-exoplanet.60653/
We also have some new reports from JWST where gas giant planets like Saturn size do not follow our solar system metal content. Too much carbon relative to oxygen likely leads to planets with little or no water evolving from their postulated protoplanetary discs. https://forums.space.com/threads/we...ter-exoplanet-that-defies-expectations.60679/
At the moment, with more than 5300 exoplanets documented now, Earth definitely has life on it, a fossil record, and plenty of water. Still waiting to see confirmation of a habitable exoplanet with these same properties. Rare Earth? So far, very rare Earth.