HD 63433 c
HD 63433 c (TOI-1726 c) is a mini-Neptune exoplanet orbiting the Sun-like star HD 63433. It is the outermost planet in its planetary system, being located 0.1448 astronomical units (21,660,000 km) from its star, and completing one orbit every 21 days. Despite being the outermost planet in the system, it is still located close to its star, meaning that its temperature is hot, being estimated between 267 and 406 °C. HD 63433 c is about 2.7 times larger than Earth and 15.5 times more massive, but still smaller and less massive than Neptune. In 2022, a study showed that its atmosphere, made up of hydrogen, is being evaporated by the strong radiation from its star, causing it to slowly turn into a super-Earth planet.
| Discovery | |
|---|---|
| Discovered by | Mann et al. (THYME) |
| Discovery date | 30 April 2020 |
| Transit | |
| Designations | |
| TOI-1726 c, BD+27 1490 c, HIP 38228 c, V377 Geminorum c | |
| Orbital characteristics | |
| 0.1448+0.0073 −0.0077 AU | |
| Eccentricity | 0.21+0.33 −0.14 |
| 20.54 days | |
| Inclination | 89.28°+0.4° −0.22° |
| Star | HD 63433 |
| Physical characteristics | |
Mean radius | 2.692±0.108 R🜨 |
| Mass | 15.54±3.86 M🜨 |
Mean density | 4.6±1.3 g/cm3 |
| Temperature | Teq: 540+10 −9 — 679+13 −11 K |
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