Climate of an ultra hot Jupiter: Spectroscopic phase curve of WASP-18b with HST/WFC3 - Arcangeli, J; Desert, J-M; Parmentier, V; Stevenson, KB; Bean, JL; Line, MR; Kreidberg, LK; Fortney, JJ; Showman, AP (Astronomy and Astrophysics, 2019)