A multiplanet system of super-Earths orbiting the brightest red dwarf star GJ 887

Jeffers, S. V.; Dreizier, S.; Barnes, J. R.; Haswell, C. A.; Nelson, R. P.; Rodriguez, E.; Lopez-Gonzalez, M. J.; Morales, N.; Luque, R.; Zechmeister, M.; Vogt, S. S.; Jenkins, J. S.; Palle, E.; Berdinas, Z. M.; Coleman, G. A. L.; et. al.

Abstract

The closet exoplanets to the Sun provide opportunities for detailed characterization of planets outside the Solar System. We report the discovery, using radial velocity measurements, of a compact multiplanet system of super-Earth exoplanets orbiting the nearby red dwarf star GJ 887. The two planets have orbital periods of 9.3 and 21.8 days. Assuming an Earth-like albedo, the equilibrium temperature of the 21.8-day planet is similar to 350 kelvin. The planets are interior to, but close to the inner edge of, the liquid-water habitable zone. We also detect an unconfirmed signal with a period of similar to 50 days, which could correspond to a third super-Earth in a more temperate orbit. Our observations show that GJ 887 has photometric variability below 500 parts per million, which is unusually quiet for a red dwarf.

Más información

Título según WOS: A multiplanet system of super-Earths orbiting the brightest red dwarf star GJ 887
Título de la Revista: SCIENCE
Volumen: 368
Número: 6498
Editorial: AMER ASSOC ADVANCEMENT SCIENCE
Fecha de publicación: 2020
Página de inicio: 1477
Página final: +
DOI:

10.1126/SCIENCE.AAZ0795

Notas: ISI