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Espinoza-Retamal, Marcelo Tala Pinto, Rafael Brahm, Rodrigo Leiva, Vincent Suc","submitted_at":"2024-06-26T18:00:00Z","abstract_excerpt":"We constrain the sky-projected obliquities of two low-density hot Neptune planets, HATS-38 b and WASP-139 b, orbiting nearby G and K stars using Rossiter-McLaughlin (RM) observations with VLT/ESPRESSO, yielding $\\lambda = -108_{-16}^{+11}$ deg and $-85.6_{-4.2}^{+7.7}$ deg, respectively. To model the RM effect, we use a new publicly available code, ironman, which is capable of jointly fitting transit photometry, Keplerian radial velocities, and RM effects. 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