ESPRESSO high-resolution transmission spectroscopy of WASP-76 b

Aims. We report on ESPRESSO high-resolution transmission spectroscopic observations of two primary transits the highly irradiated, ultra-hot Jupiter-sized planet, WASP-76b. investigated presence several key atomic and molecular features interest that may reveal atmospheric properties planet. Methods. extracted spectra WASP-76b with R ? 140 000 using a procedure allowed us to process full wavelength range (3800–7880 ?) simultaneously. observed at high signal-to-noise ratio, continuum shows ‘wiggles’, which are likely caused by an interference pattern outside spectrograph. To search for planetary features, we visually analysed cross-correlated against theoretical different species. Results. The following detected: Li I , Na Mg Ca II Mn K Fe . All detected confidence level between 9.2 ? (Na ) 2.8 (Mg ). did not detect species: Ti Cr Ni TiO, VO, ZrO. impose 1 upper limits their detectability: 60, 77, 122, 6, 8, 8 ppm, respectively. Conclusions. detection first time. In addition, confirm as previously reported in literature. show employed this work can down ~0.1% spectrum ~10 ppm means cross-correlation method. discuss neutral singly ionised atmosphere