A multiplanet system of super-Earths orbiting the brightest red dwarf star GJ 887
Author
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Jeffers, S. V.
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Dreizier, S.
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Barnes, J. R.
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Haswell, C. A.
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Nelson, R. P.
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Rodríguez, E.
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López González, M. J.
Author
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Morales, N.
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Luque, R.
Author
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Zechmeister, M.
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Vogt, S. S.
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Jenkins, James Stewart
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Palle, E.
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Berdinas, Z. M.
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Coleman, G.
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Díaz, M. R.
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Ribas, I.
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Jones, H.R.A.
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Butler, R. P.
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Tinney, C. G.
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Bailey, J.
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Carter, B. D.
Author
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O'Toole, S.
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Wittenmyer, R. A
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Crane, J. D.
Author
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Feng, F.
Author
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Shectman, S. A.
Author
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Teske, J.
Author
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Reiners, A.
Author
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Amado, P. J.
Author
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Anglada Escude, G.
Admission date
dc.date.accessioned
2020-10-14T20:54:20Z
Available date
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2020-10-14T20:54:20Z
Publication date
dc.date.issued
2020
Cita de ítem
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Science Vol. 368, Issue 6498, pp. 1477-1481
es_ES
Identifier
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10.1126/science.aaz0795
Identifier
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https://repositorio.uchile.cl/handle/2250/177133
Abstract
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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.
es_ES
Patrocinador
dc.description.sponsorship
German Research Foundation (DFG)
FOR2544
JE 701/3-1
German Research Foundation (DFG)
SPP 1992
JE 701/5-1
Science & Technology Facilities Council (STFC)
ST/P000584/1
ST/T000295/1
ST/P000592/1
Spanish Agencia Estatal de Investigacion
AYA2017-89637R
AYA2016-79425-C3-3-S
ESP2017-87676-C5-2-R
ESP2017-87143R
PGC2018-098153-B-C31
ESP2016-80435-C2-2-R
Centre of Excellence "Severo Ochoa" Instituto de Astrofisica de Andalucia
SEV-2017-0709
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
CONICYT FONDECYT
3180405
Swiss National Science Foundation (SNSF)
CONICYT/PFCHA-Doctorado Nacional, Chile
21140646
Spanish Government
ESP2016-80435-C2-1-R
PGC2018-098153-B-C33
European Union (EU)
ESP2016-80435-C2-1-R
PGC2018-098153-B-C33
Generalitat de Catalunya/CERCA program
Science & Technology Facilities Council (STFC)
ST/M001008/1
Australian Research Council
DP0774000
DP130102695
DP170103491
NASA through Hubble Fellowship - Space Telescope Science Institute
HST-HF2-51399.001
Ministerio de Ciencia, Innovacion y Universidades Ramon y Cajal fellowship
RYC-2017-22489
Science & Technology Facilities Council (STFC)
ST/P000592/1
National Aeronautics & Space Administration (NASA)
NAS5-26555