Planet Hunters TESS III: two transiting planets around the bright G dwarf HD 152843
Article
Article Title | Planet Hunters TESS III: two transiting planets around the bright G dwarf HD 152843 |
---|---|
ERA Journal ID | 1074 |
Article Category | Article |
Authors | Eisner, N. L., Nicholson, B. A., Barragan, O., Aigrain, S., Lintott, C., Kaye, L., Klein, B., Miller, G., Taylor, J., Zicher, N., Buchhave, L. A., Caldwell, D. A., Horner, J., Llama, J., Mortier, A., Rajpaul, V. M., Stassun, K., Sporer, A., Tkachenko, A., Jenkins, J. M., Latham, D., Ricker, G., Seager, S., Winn, J., Alhassan, S., Baeten, E. M. L., Bean, S.J., Bundy, D. M., Efremov, V., Ferstenou, R., Goodwin, B. L., Hof, M., Hoffman, T., Hubert, A., Lau, L., Lee, S., Maetschke, D., Peltsch, K., Rubio-Alfaro, C. and Wilson, G. M. |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 505 (2), pp. 1827-1840 |
Number of Pages | 14 |
Year | 2021 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stab1253 |
Web Address (URL) | https://academic.oup.com/mnras/article/505/2/1827/6274703 |
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. |
Keywords | methods: statistical; planets and satellites: detection; stars: fundamental parameters; stars: individual: TIC 349488688, HD152843 |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2021 the Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | University of Oxford, United Kingdom |
Centre for Astrophysics | |
Oxlea NHS Foundation Trust, United Kingdom | |
Technical University of Denmark, Denmark | |
SETI Institute, United States | |
Lowell Observatory, United States | |
University of Cambridge, United Kingdom | |
Vanderbilt University, United States | |
Massachusetts Institute of Technology, United States | |
Catholic University of Leuven, Belgium | |
National Aeronautics and Space Administration (NASA), United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Princeton University, United States |
https://research.usq.edu.au/item/w13x6/planet-hunters-tess-iii-two-transiting-planets-around-the-bright-g-dwarf-hd-152843
Download files
50
total views23
total downloads0
views this month0
downloads this month