The Hubble Space Telescope have investigated 25 exoplanets to find out about how the composition of their atmospheres.
In the last decade, we’ve become remarkably good at identifying exoplanets, or planets outside our solar system. In fact, we recently passed an impressive milestone of over 5,000 confirmed exoplanets discovered. However, most of these detections tell us little about the planets we’ve identified — typically only their distance from their host star, and their mass or size.
“Hubble enabled the in-depth characterization of 25 exoplanets, and the amount of information we learned about their chemistry and formation — thanks to a decade of intense observing campaigns — is incredible,” said lead author of the study, Quentin Changeat, in a statement. This meant they could learn about correlations between atmospheric composition and other qualities, such as whether they showed thermal inversion — where an atmosphere gets hotter at higher altitudes. Thermal inversion was observed in the hottest exoplanets, with temperatures over 2,000 kelvin. The researchers also noted that there were hydrogen ions, titanium oxide, vanadium oxide, or iron hydride in almost all these hot atmospheres.
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