| Discovery | |
|---|---|
| Discovered by | Mann et al. (THYME) |
| Discovery date | 30 April 2020 |
| Transit | |
| Designations | |
| TOI-1726 b, BD+27 1490 b, HIP 38228 b, V377 Geminorum b | |
| Orbital characteristics | |
| 0.0714+0.0036 −0.0038 AU | |
| Eccentricity | 0.129+0.170 −0.094 |
| 7.108 days | |
| Inclination | 89.49°+0.87° −0.4° |
| Star | HD 63433 |
| Physical characteristics | |
Mean radius | 2.14+0.089 −0.069 R🜨 |
| Mass | <21.76 M🜨 |
Mean density | <13 g/cm3 |
| Temperature | Teq: 769+15 −13[a] — 967+18.5 −16 K [b] |
HD 63433 b is an exoplanet orbiting the Sun-like star HD 63433.[1] It is classified as a mini-Neptune exoplanet, being 2.14 times larger than Earth, but 45% smaller than Neptune.[2] The upper mass limit for this planet is 21.7 ME,[2] which is greater than the masses of Neptune and Uranus. The planet orbits close to its star, being located at a distance of 0.0719 astronomical units (10,760,000 km) from it, witn an orbital period of just 7 days.[2] The proximity of its star makes it a hot planet, with an estimated temperature of between 496 and 604 °C.[2]
Characteristics edit
[3] According to theoretical models, HD 63433 b is composed mainly of silicate and water, with no iron dominance.[2] Due to the lack of a mass measurement, the planet's gaseous envelope has not yet been constrained.[2] The planet has a radius equivalent to 2.14 R🜨, 45% smaller than Neptune, and an upper mass limit of 21.76 M🜨.[1] These values calculate an upper density limit of 13 g/cm3,[2] 2.5 times greater than Earth's density[note 1] and similar to that of the chemical element Mercury. HD 63433 b orbits close to its star, being located at a distance of 0.072 astronomical units (10,800,000 km) from it, with an orbital period of 7 days.[2] The proximity of its star makes it hot, with an estimated temperature of between 496 and 694 °C.[3]
Host star edit
The host star of HD 63433 b is HD 63433, a G-type main-sequence star that is located 73 light-years from Earth in the constellation Gemini. The properties of this star, such as its radius (0.912 R☉) and its mass (0.99 M☉) are very similar to those of the Sun, which makes it classified as a Solar analog. The star is part of the Ursa Major moving group, allowing its age to be estimated at 414±23 million years. There are other exoplanets orbiting this star, HD 63433 c also a mini-Neptune, and HD 63433 d, an Earth-sized planet.
References edit
- ^ a b Mann, Andrew W.; Johnson, Marshall C.; Vanderburg, Andrew; Kraus, Adam L.; Rizzuto, Aaron C.; Wood, Mackenna L.; Bush, Jonathan L.; Rockcliffe, Keighley; Newton, Elisabeth R.; Latham, David W.; Mamajek, Eric E.; Zhou, George; Quinn, Samuel N.; Thao, Pa Chia; Benatti, Serena (2020-09). "TESS Hunt for Young and Maturing Exoplanets (THYME). III. A Two-planet System in the 400 Myr Ursa Major Group". The Astronomical Journal. 160 (4): 179. doi:10.3847/1538-3881/abae64. ISSN 1538-3881.
{{cite journal}}: Check date values in:|date=(help)CS1 maint: unflagged free DOI (link) - ^ a b c d e f g h Mallorquín, M.; Béjar, V. J. S.; Lodieu, N.; Osorio, M. R. Zapatero; Tabernero, H.; Mascareño, A. Suárez; Zechmeister, M.; Luque, R.; Pallé, E.; Montes, D. (2023-03-01). "Dynamical masses of two young transiting sub-Neptunes orbiting HD 63433". Astronomy & Astrophysics. 671: A163. doi:10.1051/0004-6361/202245397. ISSN 0004-6361.
- ^ a b Zhang, Michael; Knutson, Heather A.; Wang, Lile; Dai, Fei; dos Santos, Leonardo A.; Fossati, Luca; Henry, Gregory W.; Ehrenreich, David; Alibert, Yann; Hoyer, Sergio; Wilson, Thomas G.; Bonfanti, Andrea (2022-01-17). "Detection of Ongoing Mass Loss from HD 63433c, a Young Mini-Neptune". The Astronomical Journal. 163 (2): 68. doi:10.3847/1538-3881/ac3f3b. ISSN 0004-6256.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ^ "Facts About Earth - NASA Science". science.nasa.gov. Retrieved 2023-12-04.