A new analysis of the Jupiter-sized exoplanet WASP-76 b reveals that the world is carrying the remains of its long-lost neighbor in its atmosphere.
Heatwaves on Earth may be uncomfortable and even dangerous for some, but our planet has nothing on the blisteringly hot world of WASP-76 b.
"Truly rare are the times when an exoplanet hundreds of light years away can teach us something that would otherwise likely be impossible to know about our own solar system," team leader and Université de Montréal Trottier Institute for Research on Exoplanets Ph.D. Stefan Pelletier said in a statement."This is the case with this study.
Spurred on by these previous investigations of WASP-76 b, Pelletier was inspired to obtain new observations of WASP-76 b with the MAROON-X high-resolution optical spectrograph on the Gemini North 8-meter Telescope in Hawaii, part of the International Gemini Observatory. This allowed the team to study the composition of the ultra hot Jupiter in unprecedented detail.
What Pelletier and colleagues discovered during their investigation of WASP-76 b was that the abundance of elements like manganese, chromium, magnesium, vanadium, barium, and calcium match closely, not only the abundances of these elements in its own star but also the quantities found in the sun. Not everything discovered about the composition of WASP-76 b was so expected, however. The team discovered that certain elements in the atmosphere of Wasp-76 b appeared to be"depleted."
"If confirmed, this finding would mean that two giant exoplanets that have slightly different temperatures from one another could have very different atmospheres," Pelletier explained."Kind of like two pots of water, one at -1°C that is frozen, and one that is at +1°C that is liquid. For example, calcium is observed on WASP-76 b, but it may not be on a slightly colder planet.
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