The ExoplaNeT accRetion mOnitoring sPectroscopic surveY (ENTROPY) aims at investigating into the until now poorly understood process of accretion among planetary mass companions. The detection of emission lines from accreting gas giants facilitates detailed investigations into this process.

The data released via this collection are the high-resolution (R ∼ 50000), stacked, flux-calibrated 1D spectra obtained with the Echelle spectrograph UVES (3200–6800 Å) of the few known young, planetary-mass objects with observed emission.

This first release consists of spectra of the isolated, free-floating accreting protoplanet 2MASS J11151597+1937266 (2M1115), obtained between 10-11 June 2023 as part of the ESO programme 0111.C-0166(A). A spectrum is extracted for each arm of UVES (Blue, RedU, RedL) separately and weighted-averaged over the 4 individual exposures (740 s each) obtained across the two nights of observation.

More information about the programme can be found in the accompanying documentation and in the associated publication Viswanath et al. 2024.

The spectra are available from the ESO Science Portal or programmatically. The DOI assigned to the ENTROPY collection is 10.18727/archive/97.