Seminar: Atmospheres of ultra-hot exoplanets: Metals and chemistry on WASP-121b

  • Date: –15:00
  • Location: Ångströmlaboratoriet, Lägerhyddsvägen 1 95110 Å and Zoom: https://uu-se.zoom.us/j/62091586806
  • Lecturer: Jens Hoeijmakers, Lund University
  • Contact person: Anish Amarsi
  • Seminarium

Ultra-hot Jupiters form a new class of exoplanets that tend to orbit hot early type stars in short periods. The hottest of these may be heated to temperatures of far over 2,000 K on their day-sides. The extreme temperature dissociates all but the most strongly bound molecules (CO, water, metal oxides and hydrates) and a significant fraction of the atomic gas may be thermally ionised. Under these circumstances, line absorption lines by metals are dominant sources of opacity. We have carried out observations of the ultra-hot Jupiter WASP-121 b, revealing a rich spectrum of various metals, including iron and vanadium, but with a notable absence of titanium, which may be due to condensation processes. In this talk I will present our recent observations and demonstrate the power of high-resolution ground-based spectrographs in helping us understand the chemistries of exoplanets.

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We will take the speaker to lunch at Sven Dufva (departing house 9, floor 5 of Å at around 12.20). There will be fika after the seminar.