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Gliese 887 c

From Wikipedia, the free encyclopedia
Super-Earth orbiting Gliese 887
Gliese 887 c
Discovery[1]
Discovered byTuomiet al.
Discovery dateJune 2019
Radial velocity
Designations
Gliese 887 c
Orbital characteristics
0.120±0.004AU[2]
Eccentricity0.03+0.21
−0.03
[1]
21.789+0.004
−0.005
d[2]
Semi-amplitude2.8±0.4[2]
StarGliese 887
Physical characteristics
Mass7.6±1.2M🜨[2]
Temperature352 K (79 °C; 174 °F)[2]

Gliese 887 c (GJ 887 c) orLacaille 9352 c is anexoplanet announced in 2020 and located 10.74 light years away, in the constellation of Piscis Austrinus.[3]

It was detected using the radial velocity method from observations withHARPS in Chile andHIRES in Hawaii.[2]

Characteristics

[edit]

Gliese 887 c is considered aSuper-Earth with a minimum mass of 7.6 Earth masses.[4]

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).[5]

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

Host star

[edit]
Main article:Gliese 887

The planet orbits the red dwarf star Gliese 887, which has an age of 4.57 billion years.[6]

References

[edit]
  1. ^abTuomi, M.; et al. (11 June 2019). "Frequency of planets orbiting M dwarfs in the Solar neighbourhood".arXiv:1906.04644 [astro-ph.EP].
  2. ^abcdefgJeffers, 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
  3. ^"The Extrasolar Planet Encyclopaedia — GJ 887 c".Extrasolar Planets Encyclopaedia. 1995. Retrieved2020-06-30.
  4. ^Prostak, Sergio (June 26, 2020)."Compact System of Super-Earths Found around Lacaille 9352".Sci News. RetrievedJune 30, 2020.
  5. ^Carter, Jamie."Planets Found Around 'Best Star By Far' Just 11 Light-Years Away".Forbes. Retrieved2020-06-30.
  6. ^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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