A dataset provided by the European Space Agency

Obs ID 1709374
Target/Line-of-sight HD88986
Gaia DR2 ID Gaia DR2 741184091114529792
URL https://cheops.unige.ch/archive_browser/?visit-id=1709374
DOI https://doi.org/10.5270/esa-tzbsdx5
Author European Space Agency
Description of observation
  • Target RA (J2000): 154.116669 °
  • Target Dec (J2000): 28.68205 °
  • Gaia GMag: 6.298

  • Programme ID: CH_PR420007
  • PI of observing programme: Heidari
  • Title of programme: Observing the second HD88986b transit event: a temperate sub-Neptune characterized by TESS and SOPHIE
  • Abstract: Here, we confirm the planetary nature of one of the TESS single transit events with 189$\pm 11$ ppm depth and duration of 14.5$_{0.9}^{0.8}$ h, using 365 SOPHIE radial velocity measurements. We show that the planet is a sub-Neptune orbiting every $146.31^{+0.31}_{-0.31}$ d around one of the nearest and brightest star HD88986 (G2v type, G$_{mag}$=6.30, T$_{eff}$=5960$_{180}^{280}$ K). The planet mass and radius are 19.4$_{2.7}^{2.6}$ M$_{E}$ and 2.36 $\pm 0.1$ R$_{E}$ which translate to the high density of $8.1^{+1.7}_{-1.5}$ g cm$^{-3}$. HD88986 b has the longest periods among the accurately characterized transiting sub-Neptune, hence it is a temperate (T$_{eff}=$ $476^{+13}_{-10.}$) sub-Neptune, which make it an interesting target for the study of the internal structure. we propose to use CHEOPSs unique photometric capability to have $\sim$ 40 \% better estimation on the planet radius uncertainty, which highlights the importance of the high-precision CHEOPS photometry to achieve the better precision on the bulk density needed for internal structure modeling.
Temporal Coverage 2022-02-08T20:36:51Z / 2022-02-15T15:55:00Z
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 2024-10-31T19:59:08Z
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, 'HD88986', 3.0, European Space Agency, https://doi.org/10.5270/esa-tzbsdx5