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

S. V. Jeffers; S. Dreizler; J. R. Barnes; C. A. Haswell; R. P. Nelson; E. Rodríguez; M. J. López-González; N. Morales; R. Luque; M. Zechmeister; S. S. Vogt; J. S. Jenkins; E. Palle; Z. M. Berdinãs; G. A. L. Coleman; M. R. Diáz; I. Ribas; H. R. A. Jones; R. P. Butler; C. G. Tinney; J. Bailey; B. D. Carter; S. O'Toole; R. A. Wittenmyer; J. D. Crane; F. Feng; S. A. Shectman; J. Teske; A. Reiners; P. J. Amado; G. Anglada-Escudé

doi:10.1126/science.aaz0795

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

S. V. Jeffers^*, S. Dreizler, J. R. Barnes, C. A. Haswell, R. P. Nelson, E. Rodríguez, M. J. López-González, N. Morales, R. Luque, M. Zechmeister, S. S. Vogt, J. S. Jenkins, E. Palle, Z. M. Berdinãs, G. A. L. Coleman, M. R. Diáz, I. Ribas, H. R. A. Jones, R. P. Butler, C. G. TinneyJ. Bailey, B. D. Carter, S. O'Toole, R. A. Wittenmyer, J. D. Crane, F. Feng, S. A. Shectman, J. Teske, A. Reiners, P. J. Amado, G. Anglada-Escudé

^*Corresponding author for this work

Australian Astronomical Optics

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

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.

Original language	English
Pages (from-to)	1477-1481
Number of pages	5
Journal	Science
Volume	368
Issue number	6498
DOIs	https://doi.org/10.1126/science.aaz0795
Publication status	Published - 26 Jun 2020

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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., Berdinãs, Z. M., Coleman, G. A. L., Diáz, M. R., Ribas, I., Jones, H. R. A., Butler, R. P., ... Anglada-Escudé, G. (2020). A multiplanet system of super-Earths orbiting the brightest red dwarf star GJ 887. Science, 368(6498), 1477-1481. https://doi.org/10.1126/science.aaz0795

@article{11b414e81f6047d2b93b65edd87fe92d,

title = "A multiplanet system of super-Earths orbiting the brightest red dwarf star GJ 887",

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.",

author = "Jeffers, {S. V.} and S. Dreizler and Barnes, {J. R.} and Haswell, {C. A.} and Nelson, {R. P.} and E. Rodr{\'i}guez and L{\'o}pez-Gonz{\'a}lez, {M. J.} and N. Morales and R. Luque and M. Zechmeister and Vogt, {S. S.} and Jenkins, {J. S.} and E. Palle and Berdin{\~a}s, {Z. M.} and Coleman, {G. A. L.} and Di{\'a}z, {M. R.} and I. Ribas and Jones, {H. R. A.} and Butler, {R. P.} and Tinney, {C. G.} and J. Bailey and Carter, {B. D.} and S. O'Toole and Wittenmyer, {R. A.} and Crane, {J. D.} and F. Feng and Shectman, {S. A.} and J. Teske and A. Reiners and Amado, {P. J.} and G. Anglada-Escud{\'e}",

year = "2020",

month = jun,

day = "26",

doi = "10.1126/science.aaz0795",

language = "English",

volume = "368",

pages = "1477--1481",

journal = "Science (New York, N.Y.)",

issn = "0036-8075",

publisher = "American Association for the Advancement of Science",

number = "6498",

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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 2020, 'A multiplanet system of super-Earths orbiting the brightest red dwarf star GJ 887', Science, vol. 368, no. 6498, pp. 1477-1481. https://doi.org/10.1126/science.aaz0795

TY - JOUR

T1 - A multiplanet system of super-Earths orbiting the brightest red dwarf star GJ 887

AU - Jeffers, S. V.

AU - Dreizler, S.

AU - Barnes, J. R.

AU - Haswell, C. A.

AU - Nelson, R. P.

AU - Rodríguez, E.

AU - López-González, M. J.

AU - Morales, N.

AU - Luque, R.

AU - Zechmeister, M.

AU - Vogt, S. S.

AU - Jenkins, J. S.

AU - Palle, E.

AU - Berdinãs, Z. M.

AU - Coleman, G. A. L.

AU - Diáz, M. R.

AU - Ribas, I.

AU - Jones, H. R. A.

AU - Butler, R. P.

AU - Tinney, C. G.

AU - Bailey, J.

AU - Carter, B. D.

AU - O'Toole, S.

AU - Wittenmyer, R. A.

AU - Crane, J. D.

AU - Feng, F.

AU - Shectman, S. A.

AU - Teske, J.

AU - Reiners, A.

AU - Amado, P. J.

AU - Anglada-Escudé, G.

PY - 2020/6/26

Y1 - 2020/6/26

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85087138979&partnerID=8YFLogxK

U2 - 10.1126/science.aaz0795

DO - 10.1126/science.aaz0795

M3 - Article

C2 - 32587019

AN - SCOPUS:85087138979

VL - 368

SP - 1477

EP - 1481

JO - Science (New York, N.Y.)

JF - Science (New York, N.Y.)

SN - 0036-8075

IS - 6498

ER -

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

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