Journal
ASTRONOMY & ASTROPHYSICS
Volume 664, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/202243834
Keywords
planetary systems; techniques: photometric; techniques: radial velocities; stars: late-type; planets and satellites: individual: HD 260655
Categories
Funding
- NASA Explorer Program
- Max-Planck-Gesellschaft (MPG)
- Consejo Superior de Investigaciones Cientificas (CSIC)
- Ministerio de Economia y Competitividad (MINECO)
- European Regional Development Fund (ERDF) [FICTS-2011-02, ICTS-2017-07-CAHA-4, CAHA16-CE-3978]
- NASA Exoplanet Exploration Program
- NASA Ames Research Center
- University of La Laguna through the Margarita Salas Fellowship from the Spanish Ministry of Universities [UNI/551/2021]
- EU Next Generation funds
- Agencia Estatal de Investigacion of the Ministerio de Ciencia e Innovacion
- ERDF A way of making Europe [PID2019-109522GB-C5[1:4]/AEI/10.13039/501100011033]
- Centre of Excellence Severo Ochoa [CEX2019-000920-S]
- Maria de Maeztu awards [CEX2019-000920-S]
- Instituto de Astrofisica de Andalucia [SEV-2017-0709]
- Centro de Astrobiologia [MDM-2017-0737]
- Generalitat de Catalunya/CERCA programme
- Deutsche Forschungsgemeinschaft (DFG) [FOR2544, RE 2694/8-1, KU 3625/2-1, EXC-2094 - 390783311, JE 701/5-1]
- National Aeronautics and Space Administration [80NSSC21K0367, 80NSSC22K0165, 80NSSC21K0593]
- National Science Foundation
- Tennessee State University
- State of Tennessee through its Centers of Excellence Program
- Bulgarian BNSF program VIHREN-2021 project [KP-06-DV/5]
- NASA's Science Mission Directorate
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This study reports the discovery of a multiplanetary system transiting the M0 V dwarf HD 260655. The system consists of at least two transiting planets, HD 260655 b and HD 260655 c. Both planets have been detected in transit by the TESS mission and confirmed independently with radial velocity measurements. The system is notable for being relatively close to Earth and having a bright host star, making it ideal for atmospheric studies with the James Webb Space Telescope.
We report the discovery of a multiplanetary system transiting the M0 V dwarf HD 260655 (GJ 239, TOI-4599). The system consists of at least two transiting planets, namely HD 260655 b, with a period of 2.77 d, a radius of R-b = 1.240 +/- 0.023 R-circle plus, a mass of M-b( )= 2.14 +/- 0.34 M-circle plus, and a bulk density of rho(b) = 6.2 +/- 1.0 g cm(-3), and HD 260655 c, with a period of 5.71 d, a radius of R-c = 1.533(-0.046)(+0.051) R-circle plus, a mass of M-c = 3.09 +/- 0.48 M-circle plus, and a bulk density of rho(c) = 4.7(-0.8)(-0.9) g cm(-3). The planets have been detected in transit by the Transiting Exoplanet Survey Satellite (TESS) mission and confirmed independently with archival and new precise radial velocities obtained with the HIRES and CARMENES instruments since 1998 and 2016, respectively. At a distance of 10 pc, HD 260655 has become the fourth closest known multitransiting planet system after HD 219134, LTT 1445 A, and AU Mic. Due to the apparent brightness of the host star (J = 6.7 mag), both planets are among the most suitable rocky worlds known today for atmospheric studies with the James Webb Space Telescope, both in transmission and emission.
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