ENTROPY DR2. Optical He I line profiles of the accreting super-Jupiter Delorme 1 (AB)b

Summary

The files consist of the flux-calibrated, median stacked He I line profiles from the accreting circumbinary companion Delorme 1 (AB). The data results from the high-resolution (R~50,000) observations by the Ultraviolet and Visual Echelle Spectrograph (UVES) at ESO's Very Large Telescope (VLT) in Chile, from Oct 2021 and multiple epochs from Oct 2022 to January 2023, taken as part of the ESO programme 0110.C-0203(A). This is the underlying data used for the analysis in the publication Viswanath et al. (2026, accepted in A&A). 

Details of Observations

Time-resolved observations of Delorme 1 (AB)b were carried out between 13 Oct 2022 to 2 Jan 2023 as part of the ExoplaNeT accretion mOnitoring sPectroscopic surveY (ENTROPY) in #Dichroic 1 mode with both the blue (390 nm) and red (580 nm) arms using a 0.8 arcsec wide slit without AO or chopping. A total of 31 exposures were obtained over days to months, each spanning 1482 sec of integration time. This data was combined with the observations of the target on 25 Oct 2021 using the same observation set up, to yield a total of 13.6 hr of integration time on the target. The resulting spectra were median stacked after correcting for barycentric motion and the target's radial velocity.

For details of data reduction and flux calibration, we refer the user to Demars et al. (2026)

Target

Identifier: Delorme 1 (AB)b

Distance: 45 ± 3 pc

Age: 40 Myr

Mass: 13±5 Mjup

Radius: 0.16 Rsun

Effective Temperature: 1801 K