Planet Hunters TESS III: Two transiting planets around the bright G dwarf HD 152843

N. L. Eisner, B. A. Nicholson, O. Barragán, S. Aigrain, C. Lintott, L. Kaye, B. Klein, G. Miller, J. Taylor, N. Zicher, L. A. Buchhave, D. A. Caldwell, J. Horner, J. Llama, A. Mortier, V. M. Rajpaul, K. Stassun, A. Sporer, A. Tkachenko, J. M. JenkinsD. Latham, G. Ricker, S. Seager, J. Winn, S. Alhassan, E. M.L. Baeten, S. J. Bean, D. M. Bundy, V. Efremov, R. Ferstenou, B. L. Goodwin, M. Hof, T. Hoffman, A. Hubert, L. Lau, S. Lee, D. Maetschke, K. Peltsch, C. Rubio-Alfaro, G. M. Wilson

Research output: Contribution to journalArticlepeer-review

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Abstract

We report on the discovery and validation of a two-planet system around a bright (V = 8.85 mag) early G dwarf (1.43 R⊙, 1.15 M⊙, TOI 2319) using data from NASA's Transiting Exoplanet Survey Satellite (TESS). Three transit events from two planets were detected by citizen scientists in the month-long TESS light curve (sector 25), as part of the Planet Hunters TESS project. Modelling of the transits yields an orbital period of $11.6264 _{ - 0.0025 } ^ { + 0.0022 }$ d and radius of $3.41 _{ - 0.12 } ^ { + 0.14 }$ R⊕ for the inner planet, and a period in the range 19.26-35 d and a radius of $5.83 _{ - 0.14 } ^ { + 0.14 }$ R⊕ for the outer planet, which was only seen to transit once. Each signal was independently statistically validated, taking into consideration the TESS light curve as well as the ground-based spectroscopic follow-up observations. Radial velocities from HARPS-N and EXPRES yield a tentative detection of planet b, whose mass we estimate to be $11.56 _{ - 6.14 } ^ { + 6.58 }$ M⊕, and allow us to place an upper limit of 27.5 M⊕ (99 per cent confidence) on the mass of planet c. Due to the brightness of the host star and the strong likelihood of an extended H/He atmosphere on both planets, this system offers excellent prospects for atmospheric characterization and comparative planetology.

Original languageEnglish (US)
Pages (from-to)1827-1840
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume505
Issue number2
DOIs
StatePublished - Aug 1 2021

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • methods: statistical
  • planets and satellites: detection
  • stars: fundamental parameters
  • stars: individual: TIC 349488688, HD 152843

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