Lacaille 9352 c

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.[3]

Lacaille 9352 c
Discovery[1]
Discovered byTuomi et al.
Discovery dateJune 2019
Radial velocity
Designations
Gliese 887 c
Orbital characteristics
0.120±0.004 AU[2]
Eccentricity0.03+0.21
−0.03[1]
21.789+0.004
−0.005 d[2]
Semi-amplitude2.8±0.4[2]
StarLacaille 9352
Physical characteristics
Mass≥7.6±1.2 M⊕[2]
Temperature352 K (79 °C; 174 °F)[2]

    It was detected using the radial velocity method from observations with HARPS in Chile and HIRES in Hawaii.[2]

    Characteristics

    The planet orbits the red dwarf star Lacaille 9352, which has an age of 4.57 billion years.[4]

    Lacaille 9352 c is considered a Super-Earth with a minimum mass of 7.6 Earth masses.[5]

    Habitability

    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).[6]

    Lacaille 9352 c could be considered potentially habitable within the optimistic sample (between 5 and 10 earth masses).

    The exoplanet has a calculated equilibrium temperature of 352 K (79 °C; 174 °F).[2]

    References
    1. Tuomi, M.; et al. (11 June 2019). "Frequency of planets orbiting M dwarfs in the Solar neighbourhood". arXiv:1906.04644 [astro-ph.EP].
    2. Jeffers, S. V.; et al. (June 2020). "A multiple planet system of super-Earths orbiting the brightest red dwarf star GJ887" (PDF). Science. 368 (6498): 1477–1481. arXiv:2006.16372. Bibcode:2020Sci...368.1477J. doi:10.1126/science.aaz0795. Retrieved 9 August 2020.
    3. "The Extrasolar Planet Encyclopaedia — GJ 887 c". exoplanet.eu. Retrieved 2020-06-30.
    4. 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.
    5. Prostak, Sergio (June 26, 2020). "Compact System of Super-Earths Found around Lacaille 9352". Sci News. Retrieved June 30, 2020.
    6. Carter, Jamie. "Planets Found Around 'Best Star By Far' Just 11 Light-Years Away". Forbes. Retrieved 2020-06-30.


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