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Target RA (J2000): 197.317474365234 and deg Target Dec (J2000): -60.308349609375 and deg Gaia GMag: 8.1 Programme ID: CH_PR240025 PI of observing programme: Carlos burgo Title of programme: Constraining the orbital period of HD 114082 b the most massive among the youngest exoplanets Abstract: HD 114082 is a bright relatively nearby very young F-type star in the Scorpius-Centaurus (Sco-Cen) OB Association. It bears a nearly edge-on debris disk (Wahhaj et al. 2016) and HD 114082 b a massive planet that defies current theoretical planet formation models (Zakhozhay et al. 2022 Engler et al. 2023). The planet produced a single-transit event during the TESS observations and its orbital period was later determined using radial velocities. A second transit event detected in March by the NGTS survey provided a set of three plausible orbital periods one of them similar but still different from that derived from the radial velocity curve. The other two are quite unlike. This is not entirely surprising as constraining the orbital period of young planets solely from radial velocity measurements is very challenging and prone to underestimate uncertainties due to limitations in the stellar activity modelling. The most reliable way of confirming the orbital elements is detecting and analysing new transit events preferably from space. We propose to use 86.1 CHEOPS orbits to observe HD 114082 during three candidate transit events in accordance with the estimated orbital periods to confirm and refine the planet ephemeris and improve its characterisation. [truncated! Please see actual data for full text]