Gaia-4 b
| Discovery | |
|---|---|
| Discovered by | Stefánsson et al. 2025 |
| Discovery site | Gaia |
| Discovery date | 2025 |
| Astrometry | |
| Orbital characteristics | |
| 0.083±0.0027 AU | |
| Inclination | 89.856°+0.018° −0.017° |
| Star | Gaia-4 |
| Physical characteristics | |
Mean radius | 1.55±0.064 R⊕ |
| Temperature | 234±12 K (−39±12 °C) |
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Gaia-4 b is a super-Earth exoplanet in the habitable zone of its parent M-type star, Gaia-4. The planet is 1.55 times larger than Earth, and is located at 0.083 astronomical units (12,400,000 km) from its star.[4] The planet orbits in the habitable zone of its star and has an equilibrium temperature of 234 K (−39 °C).[4] It was discovered by the Transiting Exoplanet Survey Satellite (TESS) in 2023;[5] according to the authors of the discovery paper, it is the first TESS discovery in the conservative habitable zone.[1][2][3][4][5][6][7]
References
- ↑ "★ Gaia-4". Stellar Catalog. Retrieved 2025-10-25.
- ↑ "Gaia-4 b - NASA Science". 2025-02-15. Retrieved 2025-10-25.
- ↑ "Gaia-4 | NASA Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 2025-10-25.
- ↑ "Wobbling stars reveal hidden companions in Gaia data". www.esa.int. Retrieved 2025-10-25.
- ↑ Martin, Pierre-Yves (2025). "Planet Gaia-4 b". exoplanet.eu. Retrieved 2025-10-25.
- ↑ Stefánsson, Gudmundur; Mahadevan, Suvrath; Winn, Joshua N.; Marcussen, Marcus L.; Kanodia, Shubham; Albrecht, Simon; Fitzmaurice, Evan; Mikulskytė, Onė; Cañas, Caleb I.; Espinoza-Retamal, Juan I.; Zwart, Yiri; Krolikowski, Daniel M.; Hotnisky, Andrew; Robertson, Paul; Alvarado-Montes, Jaime A. (February 2025). "Gaia-4b and 5b: Radial Velocity Confirmation of Gaia Astrometric Orbital Solutions Reveal a Massive Planet and a Brown Dwarf Orbiting Low-mass Stars". The Astronomical Journal. 169 (2): 107. Bibcode:2025AJ....169..107S. doi:10.3847/1538-3881/ada9e1. ISSN 0004-6256.
- ↑ "First Gaia astrometric planet discovery confirmed". carnegiescience.edu. 2025-10-17. Retrieved 2025-10-25.
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