Tootfinder

A complex structure of escaping helium spanning more than half the orbit of the ultra-hot Jupiter WASP-121\,b
Romain Allart, Louis-Philippe Coulombe, Yann Carteret, Jared Splinter, Lisa Dang, Vincent Bourrier, David Lafreni\`ere, Lo\"ic Albert, \'Etienne Artigau, Bj\"orn Benneke, Nicolas B. Cowan, Ren\'e Doyon, Vigneshwaran Krishnamurthy, Ray Jayawardhana, Doug Johnstone, Adam B. Langeveld, Michael R. Meyer, Stefan Pelletier, Caroline Piaulet-Ghorayeb, Michael Radica,…

A complex structure of escaping helium spanning more than half the orbit of the ultra-hot Jupiter WASP-121\,b
Atmospheric escape of planets on short orbital periods, driven by the host star's irradiation, influences their evolution, composition, and atmospheric dynamics. Our main avenue to probe atmospheric escape is through the near-infrared metastable helium triplet, which has enabled mass loss rate measurements for tens of exoplanets. Among them, only a few studies show evidence for out-of-transit absorption, supporting the presence of a hydrodynamic outflow. However, none of these observations prec…