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

Jeffers, S. V. and Dreizler, S. and Barnes, J. R. and Haswell, C. A. and Nelson, R. P. and Rodriguez, E. and Lopez-Gonzalez, M. J. and Morales, N. and Luque, R. and Zechmeister, M. and Vogt, S. S. and Jenkins, J. S. and Palle, E. and Berdi nas, Z. M. and Coleman, G. A. L. and Diaz, M. R. and Ribas, I. and Jones, H. R. A. and Butler, R. P. and Tinney, C. G. and Bailey, J. and Carter, B. D. ORCID: https://orcid.org/0000-0003-0035-8769 and O'Toole, S. and Wittenmyer, R. A. and Crane, J. D. and Feng, F. and Shectman, S. A. and Teske, J. and Reiners, A. and Amado, P. J. and Anglada-Escude, G. (2020) A multiplanet system of super-Earths orbiting the brightest red dwarf star GJ 887. Science, 368. pp. 1477-1481. ISSN 0036-8075


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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Date Deposited: 09 Feb 2021 01:51
Last Modified: 10 Feb 2021 05:39
Uncontrolled Keywords: Astronomy; Planet SCI; Astrophysics - Earth and Planetary; Astrophysics
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.1126/science.aaz0795
URI: http://eprints.usq.edu.au/id/eprint/41140

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