TOI-4138 b
Transit | |
| Orbital characteristics[1] | |
|---|---|
| Periastron | 0.049 AU (7,300,000 km) |
| Apoastron | 0.052 AU (7,800,000 km) |
| 0.051 ± 0.002 AU (7,630,000 ± 300,000 km) | |
| Eccentricity | 0.03 ± 0.02 |
| 3.660028 ± 0.000006 d | |
| Inclination | 86.0°±0.7° |
| 2,458,708.9983 ± 0.0003 JD | |
| Semi-amplitude | 74±3 m/s |
| Star | TOI-4138 |
| Physical characteristics[1] | |
Mean radius | 1.49 ± 0.04 RJ |
| Mass | 0.67 ± 0.03 MJ |
Mean density | 250 ± 20 kg/m3 (421 ± 34 lb/cu yd) |
| Temperature | 1,762 ± 21 K (2,711.9 ± 37.8 °F; 1,488.8 ± 21.0 °C) |
TOI-4138 b is a transiting
circumpolar constellation Ursa Minor
.
Discovery
The planet was discovered by
transit method, which involves measuring light curves during a planet’s eclipse. The paper states that it’s inflated due to heating from its host star, which has a high luminosity.[2]
Its discovery was announced in October 2021.
Properties
Orbit and mass
TOI-4138 b has an
inclination is known, doppler spectroscopy measurements give the planet a mass only 67% that of Jupiter.[1] Its separation is comparable with HD 209458 b, but is much larger due to the evolved state of the host star.[1]
Radius and density
TOI-4138 b’s transit gives it a radius 1.49 times that of Jupiter; this combined with its low mass of 0.67 MJ gives it a density only 25% that of water.[1]
Host star
TOI-4138 b orbits TOI-4138, a subgiant star[1] located in the constellation Ursa Minor. The star has an enlarged radius of 1.82 R☉, a luminosity of 4.37 L☉ and an effective temperature of 6,128 K (5,855 °C).[1] It has 1.32 times the Sun's mass, and it has an intermediate age of around 3.5 billion years.[1] The apparent magnitude of the star is 11.8, making it not visible to the naked eye.[3]
References
- ^ ISSN 0035-8711.
- ^ Davis, Margaret (12 October 2021). "NASA Discovered "Hot Jupiter" Exoplanet, Bigger But Less Massive Than Solar System's Largest Planet". Science Times. Retrieved 23 December 2021.
- ^ "★ TIC 257060897". Stellar Catalog. Retrieved 2024-04-09.
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