You need to mask out the bright star with a coronagraph and then the planet needs to be big/bright enough. Even then you will just see a dot as this ESO telesco

You need to mask out the bright star with a coronagraph and then the planet needs to be big/bright enough. Even then you will just see a dot as this ESO telescope image shows. However using spectroscopy they can deduce the composition of the planet atmosphere. https://www.eso.org/public/images/potw1846a/ https://www.eso.org/public/images/potw1846a/