A Spectral Survey of WASP-19b with ESPRESSO

摘要: High resolution precision spectroscopy provides a multitude of robust techniques for probing exoplanetary atmospheres. We present multiple VLT/ESPRESSO transit observations the hot-Jupiter exoplanet WASP-19b with previously published but disputed atmospheric features from low studies. Through spectral synthesis and modeling Rossiter-McLaughlin (RM) effect we calculate stellar, orbital physical parameters system. From narrow-band do not detect any H\,I, Fe\,I, Mg\,I, Ca\,I, Na\,I K\,I neutral species, placing upper limits on their line contrasts. cross correlation analyses models, Fe\,I place 3$\sigma$ limit $\log\,(X_{\textrm{Fe}}/X_\odot) \approx -1.83\,\pm\,0.11$ its mass fraction, injection retrieval. show inability to presence H$_2$O known abundances, owing lack strong absorption bands, as well relatively S/N ratio. barely significant peak (3.02\,$\pm$\,0.15\,$\sigma$) in map TiO, consistent sub-solar abundance reported. This is merely hint TiO does \textit{not} constitute confirmation. However, confirm observed enhanced scattering towards blue wavelengths, through chromatic RM measurements, pointing hazy atmosphere. finally reanalysis transmission spectra this exoplanet, concluding that unocculted starspots alone cannot explain detected features. Our FORS2 finds $\sim$\,100$\times$ abundance, precisely constrained $\log\,X_{\textrm{TiO}} -7.52 \pm 0.38$, ESPRESSO. plausible paths reconciliation other seemingly contradicting results.