A dataset provided by the European Space Agency

Obs ID 2362702
Target/Line-of-sight Hunting a second transit of the long-period Neptune exoplanet HIP41378 e in the gaps of TESS
Gaia DR2 ID Gaia DR2 600698184764497664
URL https://cheops.unige.ch/archive_browser/?visit-id=2362702
DOI https://doi.org/10.57780/esa-ld0u7pf
Author European Space Agency, Salome grouffal
Description of observation
  • Target RA (J2000): 126.616035461426 °
  • Target Dec (J2000): 10.0803699493408 °
  • Gaia GMag: 8.819
  • Programme ID: CH_PR240015
  • PI of observing programme: Salome grouffal
  • Title of programme: Hunting a second transit of the long-period Neptune exoplanet HIP41378 e in the gaps of TESS
  • Abstract: Among more than 800 planetary systems discovered up to now, the system HIP 41378 offers wide opportunities for future atmospheric characterization of exoplanets. Observed for the first time in 2015 by the mission K2, this system is rich of at least five transiting planets around a bright late F-type star. Among them, the planet f is an interesting target for studying its atmosphere. This planet has a low density (< 0.2 g/cm3) for a planet in the habitable zone, which is not yet understood. The comparison with its twin planet, HIP41378 e (Teq ~ 400 K), offers an opportunity to understand the unique properties of the puffy planet f. However, with just one transit detected in 2015, the precise period of planet e is unknown. With this CHEOPS proposal, we aim at hunting for a second transit of planet e. No transit of this planet has been detected in the TESS data at the expected period, albeit with large gaps. We require CHEOPS observations to search for the missing transit of planet e in these gaps. The detection of a second transit of planet e will secure its orbital period and allows us to schedule follow-up observations with, e.g., HST and/ or JWST for comparative studies. It will also help to understand the architecture of this fascinating planetary system.
Temporal Coverage 2024-03-04T19:15:57Z / 2024-03-05T11:44:00Z
Version 3.0
Mission Description CHEOPS (Benz et al., https://doi.org/10.1007/s10686-020-09679-4) is a European Space Agency (ESA) mission in partnership with Switzerland with important contributions to the payload and the ground segment from Austria, Belgium, France, Germany, Hungary, Italy, Portugal, Spain, Sweden and the United Kingdom.

The satellite has a single payload comprising an ultra-high precision photometer covering the 330 - 1100 nm wavelength range in a single photometric band. Observations are made as part of the Guaranteed Time Observing Programme that is formulated by the CHEOPS Science Team, and the Guest Observers Programme through which the Community at large can apply for CHEOPS time.
Creator Contact https://www.cosmos.esa.int/web/cheops/contact
Date Published 2025-10-01T12:39:26Z
Keywords CHEOPS, EXOPLANETS, wide-band photometer
Acknowledgements https://www.cosmos.esa.int/web/cheops-guest-observers-programme/publication-guidelines
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Salome grouffal et al., 2025, 'Hunting a second transit of the long-period Neptune exoplanet HIP41378 e in the gaps of TESS', 3.0, European Space Agency, https://doi.org/10.57780/esa-ld0u7pf