A dataset provided by the European Space Agency

Obs ID 2252486
Target/Line-of-sight TIC 176797879
Gaia DR2 ID Gaia DR2 5048222066283198208
URL https://cheops.unige.ch/archive_browser/?visit-id=2252486
DOI https://doi.org/10.57780/esa-ev5979n
Author European Space Agency
Description of observation
  • Target RA (J2000): 48.582321 °
  • Target Dec (J2000): -34.03414 °
  • Gaia GMag: 11.412

  • Programme ID: CH_PR240023
  • PI of observing programme: Scarsdale
  • Title of programme: Period Measurement of The Brightest-Host Transiting Habitable Zone Terrestrial Exoplanet
  • Abstract: We propose to use CHEOPS photometry to measure the period of the Transiting Exoplanet Survey Satellite (TESS) planet candidate TOI4353.01 (TIC176797879), initially a duo-transit object that was confirmed with a transit detection in previous CHEOPS observations (priv. comm.). This object is a terrestrial-size exoplanet with three transits, each separated by 718 days (two in TESS, one in CHEOPS). This even separation and minimal phase coverage means that the period still needs to be determined. Based on the transit duration and a priori likelihood of transit, the true period is very unlikely to be 718 days, and instead is more likely to be an alias of that spacing, in the 34-60 day range. This planet is therefore a likely-terrestrial planet candidate in its star’s optimistic habitable zone (OHZ). It has potential for future mass measurement and even transmission spectroscopy thanks to its bright (for an M star) host. In fact, no other OHZ terrestrial has a host star as bright as TOI4353.01. Because of the rarity of terrestrial OHZ exoplanets and the difficulty of discovering more with TESS due to its short sectors, followup of candidates like this one is of critical importance.
Temporal Coverage 2023-10-23T13:19:00Z / 2023-10-24T00:51:00Z
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 2024-10-31T19:59:51Z
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, 'TIC 176797879', 3.0, European Space Agency, https://doi.org/10.57780/esa-ev5979n