| Discovery | |
|---|---|
| Discovered by | Tuomi et al. |
| Discovery date | June 2019 |
| Detection method | Radial velocity |
| Designations | |
| Alternative names | Gliese 887 c |
| Orbital characteristics | |
| Semi-major axis | 0.120±0.004 AU |
| Eccentricity | 0.03+0.21 −0.03 |
| Orbital period (sidereal) | 21.789+0.004 −0.005 d |
| Semi-amplitude | 2.8±0.4 |
| Star | Lacaille 9352 |
| Physical characteristics | |
| Mass | ≥7.6±1.2 ME |
| Temperature | 352 K (79 °C; 174 °F) |
Lacaille 9352 c or GJ 887 c is an exoplanet announced in 2020 and located 10.74 light years away, in the constellation of Piscis Austrinus.
It was detected using the radial velocity method from observations with HARPS in Chile and HIRES in Hawaii.
Characteristics
Lacaille 9352 c is considered a Super-Earth with a minimum mass of 7.6 Earth masses.
With an orbital period of 21.8 days, the exoplanet is located at 0.12 AU from the star, which is close to the inner edge of the habitable zone (but still outside).
The exoplanet has a calculated equilibrium temperature of 352 K (79 °C; 174 °F).
Host star
Main article: Lacaille 9352The planet orbits the red dwarf star Lacaille 9352, which has an age of 4.57 billion years.
References
- ^ Tuomi, M.; et al. (11 June 2019). "Frequency of planets orbiting M dwarfs in the Solar neighbourhood". arXiv:1906.04644 .
- ^ Jeffers, S. V.; Dreizler, S.; Barnes, J. R.; Haswell, C. A.; Nelson, R. P.; Rodríguez, E.; López-González, M. J.; Morales, N.; Luque, R.; et al. (2020), "A multiple planet system of super-Earths orbiting the brightest red dwarf star GJ887", Science, 368 (6498): 1477–1481, arXiv:2006.16372, Bibcode:2020Sci...368.1477J, doi:10.1126/science.aaz0795, PMID 32587019, S2CID 220075207
- "The Extrasolar Planet Encyclopaedia — GJ 887 c". Extrasolar Planets Encyclopaedia. 1995. Retrieved 2020-06-30.
- Prostak, Sergio (June 26, 2020). "Compact System of Super-Earths Found around Lacaille 9352". Sci News. Retrieved June 30, 2020.
- Carter, Jamie. "Planets Found Around 'Best Star By Far' Just 11 Light-Years Away". Forbes. Retrieved 2020-06-30.
- Yee, Samuel W.; Petigura, Erik A.; von Braun, Kaspar (2017). "Precision Stellar Characterization of FGKM Stars using an Empirical Spectral Library". The Astrophysical Journal. 836 (1): 77. arXiv:1701.00922. Bibcode:2017ApJ...836...77Y. doi:10.3847/1538-4357/836/1/77.
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