We report on the discovery and validation of TOI 813 b (TIC 55525572 b), a transiting exoplanet identified by citizen scientists in data from NASA’s Transiting Exoplanet Survey Satellite (TESS) and the first planet discovered by the Planet Hunters TESS project. The host star is a bright (V = 10.3 mag) subgiant (R⋆ = 1.94 R⊙, M⋆ = 1.32 M⊙). It was observed almost continuously by TESS during its first year of operations, during which time four individual transit events were detected. The candidate passed all the standard light curve-based vetting checks, and ground-based follow-up spectroscopy and speckle imaging enabled us to place an upper limit of 2 MJup (99% confidence) on the mass of the companion, and to statistically validate its planetary nature.
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
- Methods: statistical
- Planets and satellites: detection
- Stars: fundamental parameters
- Stars:individual (TIC-55525572, TOI 813)