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

*Corresponding author for this work

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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+0.0022−0.0025 days and radius of 3.41+0.14−0.12 R for the inner planet, and a period in the range 19.26–35 days 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+6.58−6.14 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 characterisation and comparative planetology.
Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Volume505
Issue number2
Pages (from-to)1827–1840
ISSN0035-8711
DOIs
Publication statusPublished - 2021

Keywords

  • Methods
  • Statistical
  • Planets and satellites: detection
  • Stars: fundamental parameters
  • Stars: individual: TIC 349488688, HD152843

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