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

DOI: 
10.1126/science.aaz0795
Publication date: 
07/07/2020
Main author: 
Jeffers S.V.
IAA authors: 
Rodríguez, E.;López-González, M.J.;Morales, N.;Amado, P.J.
Authors: 
Jeffers S.V., Dreizler S., Barnes J.R., Haswell C.A., Nelson R.P., Rodríguez E., López-González M.J., Morales N., Luque R., Zechmeister M., Vogt S.S., Jenkins J.S., Palle E., Berdi Ñas Z.M., Coleman G.A.L., Díaz M.R., Ribas I., Jones H.R.A., Butler R.P., Tinney C.G., Bailey J., Carter B.D., O'Toole S., Wittenmyer R.A., Crane J.D., Feng F., Shectman S.A., Teske J., Reiners A., Amado P.J., Anglada-Escudé G.
Journal: 
Science (New York, N.Y.)
Refereed: 
Yes
Publication type: 
Article
Volume: 
368.0
Pages: 
1477.0-1481.0
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 ~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 ~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. Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.
Database: 
SCOPUS
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2020Sci...368.1477J/abstract
ADS Bibcode: 
2020Sci...368.1477J