  The study of exoplanets and especially their atmospheres can reveal key
insights on their evolution by identifying specific atmospheric species. For
such atmospheric investigations, high-resolution transmission spectroscopy has
shown great success, especially for Jupiter-type planets. Towards the
atmospheric characterization of smaller planets, the super-Earth exoplanet 55
Cnc e is one of the most promising terrestrial exoplanets studied to date.
Here, we present a high-resolution spectroscopic transit observation of this
planet, acquired with the PEPSI instrument at the Large Binocular Telescope.
Assuming the presence of Earth-like crust species on the surface of 55 Cnc e,
from which a possible silicate-vapor atmosphere could have originated, we
search in its transmission spectrum for absorption of various atomic and
ionized species such as Fe , Fe+, Ca , Ca+, Mg and K , among others. Not
finding absorption for any of the investigated species, we are able to set
absorption limits with a median value of 1.9 x RP. In conclusion, we do not
find evidence of a widely extended silicate envelope on this super-Earth
reaching several planetary radii.
