| Title: |
A multiplanet system of super-Earths orbiting the brightest red dwarf star GJ 887 |
| Authors: |
Jeffers, SV; Dreizler, S; Barnes, JR; Haswell, CA; Nelson, RP; Rodríguez, E; López-González, MJ; Morales, N; Luque, R; Zechmeister, M; Vogt, SS; Jenkins, JS; Palle, E; Berdinãs, ZM; Coleman, GAL; Diáz, MR; Ribas, I; Jones, HRA; Butler, RP; Tinney, CG; Bailey, J; Carter, BD; O'Toole, S; Wittenmyer, RA; Crane, JD; Feng, F; Shectman, SA; Teske, J; Reiners, A; Amado, PJ; Anglada-Escudé, G |
| Source: |
urn:ISSN:0036-8075 ; urn:ISSN:1095-9203 ; Science, 368, 6498, 1477-1481 |
| Publisher Information: |
American Association for the Advancement of Science (AAAS) |
| Publication Year: |
2020 |
| Collection: |
UNSW Sydney (The University of New South Wales): UNSWorks |
| Subject Terms: |
5109 Space Sciences; 5101 Astronomical Sciences; 51 Physical Sciences; anzsrc-for: 5109 Space Sciences; anzsrc-for: 5101 Astronomical Sciences; anzsrc-for: 51 Physical Sciences |
| Description: |
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. |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/pdf |
| Language: |
unknown |
| Relation: |
https://hdl.handle.net/1959.4/unsworks_71271; https://doi.org/10.1126/science.aaz0795 |
| DOI: |
10.1126/science.aaz0795 |
| Availability: |
https://hdl.handle.net/1959.4/unsworks_71271; https://unsworks.unsw.edu.au/bitstreams/e3b147af-2aca-4f0e-87b6-56841016392e/download; https://doi.org/10.1126/science.aaz0795 |
| Rights: |
open access ; https://purl.org/coar/access_right/c_abf2 ; CC-BY-NC-ND ; https://creativecommons.org/licenses/by-nc-nd/4.0/ ; free_to_read |
| Accession Number: |
edsbas.F7D6A656 |
| Database: |
BASE |