PENELLOPE: THE ESO DATA LEGACY PROGRAM TO COMPLETE THE HUBBLE UV LEGACY LIBRARY OF YOUNG STARS (ULLYSES)

The PENELLOPE Large Programme (Programme ID 106.20Z8) is a multi-instrument spectroscopic survey aimed at obtaining complementary data to the targets of the ULLYSES program. The latter is a Hubble Space Telescope (HST) Director’s Discretionary Time that was executed in a three-year
period, from HST Cycle 27 through Cycle 29 (2020-2022). About 500 orbits of the ULLYSES programme are being devoted to the study of about 70 young low-mass stars in various star-forming regions in the Southern Hemisphere. The HST ULLYSES program is aimed at obtaining low- and medium-resolution spectra of young stars covering the wavelength range from ~140nm to ~1 um, hence providing an unprecedented view of accretion and ejection tracers at ultraviolet wavelengths. The PENELLOPE program, named in order to underline the complementarity to ULLYSES and to match its spelling flaw, is a public (no proprietary time) community-driven effort. PENELLOPE uniquely provides optical high-resolution (ESPRESSO, UVES, R>60,000) and medium-resolution flux-calibrated optical and infrared spectra (up to 2.5 um) with X-Shooter (R > 10,000), providing access to information that is otherwise not obtainable with the HST spectra provided by ULLYSES, such as main stellar properties, accurate interstellar extinction, and veiling; kinematics and geometry of the accretion and wind processes, and more.