The planet might have had an atmosphere many eons ago, but its star likely took it away, Megan Mansfield, an astronomer at the University of Arizona who also uses Webb to study exoplanets, told me. Red-dwarf stars are cool stars, technically speakingthey are far less luminous than the sunbut they
ctrum of KELT-20b Driven by Stellar UV Irradiation by Guangwei Fu, David K. Sing, Joshua D. Lothringer, Drake Deming, Jegug Ih, Eliza M. -R. Kempton, Matej Malik, Thaddeus D. Komacek, Megan Mansfield and Jacob L. Bean, 24 January 2022, Astrophysical Journal Letters.DOI: 10.3847/2041-8213/ac4968
"This kind of planet is so extreme in temperature, it is a bit separate from a lot of other exoplanets," said Megan Mansfield, a graduate student at the University of Chicago and lead author of a new paper revealing these findings. "There are some other hot Jupiters and ultra-hot Jupiters that are n