Astronomers Detect Titanium Oxide and Several Metals in Atmosphere of WASP-189b astronomy space science
« PreviousThe temperature of a planet’s atmosphere decreases with increasing altitude, unless a shortwave absorber that causes a temperature inversion exists. Ozone plays this role in the Earth’s atmosphere. In the atmospheres of highly irradiated exoplanets, the shortwave absorbers are predicted to be titanium oxide and vanadium oxide. Using high-resolution transmission spectroscopy, astronomers have now detected titanium oxide in the atmosphere of the ultrahot Jupiter WASP-189b.
“WASP-189b has a high equilibrium temperature of 2,368 degrees Celsius due to its close proximity to its hot A-type host star,” said Lund University astronomer Bibiana Prinoth and colleagues. The astronomers observed the spectrum of WASP-189 during three transit events with the High Accuracy Radial Velocity Planet Searcher spectrograph at ESO’s 3.6-m telescope in La Silla Observatory, Chile.
“The gases in its atmosphere absorb some of the starlight, similar to ozone absorbing some of the sunlight in Earth’s atmosphere, and thereby leave their characteristic ‘fingerprint’.”“The gases that left their ‘fingerprints’ in the atmosphere of WASP-189b included iron, chromium, vanadium, magnesium and manganese.”“Titanium oxide absorbs short wave radiation, such as ultraviolet radiation,” said University of Bern’s Professor Kevin Heng.
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