A dataset provided by the European Space Agency

Obs ID 2286246
Target/Line-of-sight TOI2458
Gaia DR2 ID GAIA DR2 3233785128901216128
URL https://cheops.unige.ch/archive_browser/?visit-id=2286246
DOI https://doi.org/10.57780/esa-ys648cz
Author European Space Agency
Description of observation
  • Target RA (J2000): 79.621536 °
  • Target Dec (J2000): 1.25386 °
  • Gaia GMag: 9.1

  • Programme ID: CH_PR140084
  • Programme Manager: ULMER-MOLL
  • PI of observing programme: Benz
  • Title of programme: Axis 1 - CompoSubNeptu
  • Abstract: Sub-Neptunes are the most common type of known planets in the galactic neighborhood. In spite of that, their interior composition, and therefore their origin, has to date not been constrained observationally. The reason is the degeneracy in possible compositions that can explain their observed properties. Two end member compositions are theoretically suggested: dry rocky cores + about 1% of H/He or ocean planets containing about 50% water in mass. The former is suggested by evolutionary evaporation models, the later by formation models. These compositions correspond to fundamentally different in situ formation versus orbital migration pathways. If observationally it should turn out that close-in sub-Neptunian planets are indeed water worlds, this could be seen as one of the largest successes of planet formation theory. The opposite case would mean that one or several elements of our current understanding of the origin of planets is fundamentally flawed. It is therefore of paramount importance to answer the fundamental question “What are sub-Neptunes made of?”. With this program, we propose a three-faceted approach to answer this question: 1) is there a grouping in density? 2) Preparing for the JWST opportunity. 3) Is the ice mass fraction correlated with the stellar composition? We propose to use CHEOPS for the precise radius determination of a carefully chosen sample of TESS planet candidate, whose radii make them susceptible to be either ocean worlds or rocky cores with H/He envelopes.
Temporal Coverage 2023-11-23T12:30:00Z / 2023-11-24T06:27:00Z
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 2024-10-31T20:00:01Z
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, 2024, 'TOI2458', 3.0, European Space Agency, https://doi.org/10.57780/esa-ys648cz