Astronomy:TOI-375 d
| Discovery | |
|---|---|
| Discovered by | Astronomers using the Transiting Exoplanet Survey Satellite |
| Discovery date | 2026 |
| Radial velocity | |
| Orbital characteristics | |
| 0.984 ± 0.053 | |
| Orbital period | 297.9+28.9−18.6 days |
| Star | TOI-375 |
| Physical characteristics | |
| Mean radius | 1.21 RJ (estimated) |
| Mass | 1.40 ± 0.28 MJ |
| Physics | 434 K |
TOI-375 d is a gas giant exoplanet orbiting the evolved K-type star TOI-375, located approximately 396 parsecs (about 1,290 light-years) from Earth. The planet was discovered in 2026 using the radial velocity method during follow-up observations of the TOI-375 planetary system.[1][2]
The planet is the outermost known member of the TOI-375 planetary system, which contains at least three confirmed giant planets.[1]
Discovery
The TOI-375 system was initially investigated after the discovery of the transiting hot Jupiter TOI-375 b by NASA's Transiting Exoplanet Survey Satellite (TESS).[1] Subsequent spectroscopic observations revealed additional radial velocity signals indicating the presence of two outer giant planets, designated TOI-375 c and TOI-375 d.[1]
The discovery paper describing the system was published in Monthly Notices of the Royal Astronomical Society in 2026.[1]
Host star
TOI-375 d orbits the evolved K-type star TOI-375. The host star has a mass greater than that of the Sun and is believed to be evolving away from the main sequence.[1]
Characteristics
TOI-375 d is classified as a gas giant planet with a minimum mass approximately 1.4 times that of Jupiter. Since the planet does not transit its host star from the perspective of Earth, its radius and true mass remain uncertain.[1]
The planet orbits its host star at a distance similar to that between the Earth and the Sun, completing one orbit every 297.9 days.[2] The equilibrium temperature of the planet is estimated to be approximately 434 K due to radiation from its evolved host star.[2]
Planetary system
TOI-375 d is part of a multi-planet system containing at least three known planets.[1]
The TOI-375 system's multiple giant planets orbiting an evolved star make it important for studies of planetary formation and migration.[1]
See also
- Exoplanet
- Gas giant
- Hot Jupiter
- Radial velocity
- List of exoplanets discovered in 2026
- Transiting Exoplanet Survey Satellite
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Reinarz, Y.; Jones, M. I.; Brahm, R. (2026). "A transiting hot Jupiter with two outer siblings orbiting an intermediate-mass post main-sequence star". Monthly Notices of the Royal Astronomical Society 706: A20. doi:10.1051/0004-6361/202557200. Bibcode: 2026A&A...706A..20R.
- ↑ 2.0 2.1 2.2 "TOI-375 d". NASA. 27 February 2026. https://science.nasa.gov/exoplanet-catalog/toi-375-d/.
External links
- TOI-375 d at NASA Science
- TOI-375 system at the NASA Exoplanet Archive
- TOI-375 d at The Extrasolar Planets Encyclopaedia
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