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. Lopez-Gonzalez; N. Morales; R. Luque; M. Zechmeister; S. S. Vogt; J. S. Jenkins; E. Palle; Z. M. Berdinas; G. A. L. Coleman; M. R. Diaz; 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-Escude; null .

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. Lopez-Gonzalez, N. Morales, R. Luque, M. Zechmeister, S. S. Vogt, J. S. Jenkins, E. Palle, Z. M. Berdinas, G. A. L. Coleman, M. R. Diaz, 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-Escude, .

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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

Keywords

astro-ph.EP

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2006.16372v1
© 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. This is the author’s version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science on 26 Jun 2020: Vol. 368, Issue 6498, pp. 1477-1481. DOI: https://doi.org/10.1126/science.aaz0795.
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Jeffers, S. V., Dreizler, S., Barnes, J. R., Haswell, C. A., Nelson, R. P., Rodríguez, E., Lopez-Gonzalez, M. J., Morales, N., Luque, R., Zechmeister, M., Vogt, S. S., Jenkins, J. S., Palle, E., Berdinas, Z. M., Coleman, G. A. L., Diaz, M. R., Ribas, I., Jones, H. R. A., Butler, R. P., ... . (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

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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.",

keywords = "astro-ph.EP",

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 Lopez-Gonzalez, {M. J.} and N. Morales and R. Luque and M. Zechmeister and Vogt, {S. S.} and Jenkins, {J. S.} and E. Palle and Berdinas, {Z. M.} and Coleman, {G. A. L.} and Diaz, {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-Escude and .",

note = "{\textcopyright} 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. This is the author{\textquoteright}s version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science on 26 Jun 2020: Vol. 368, Issue 6498, pp. 1477-1481. DOI: https://doi.org/10.1126/science.aaz0795.",

year = "2020",

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Jeffers, SV, Dreizler, S, Barnes, JR, Haswell, CA, Nelson, RP, Rodríguez, E, Lopez-Gonzalez, MJ, Morales, N, Luque, R, Zechmeister, M, Vogt, SS, Jenkins, JS, Palle, E, Berdinas, ZM, Coleman, GAL, Diaz, 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-Escude, 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

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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 - Lopez-Gonzalez, M. J.

AU - Morales, N.

AU - Luque, R.

AU - Zechmeister, M.

AU - Vogt, S. S.

AU - Jenkins, J. S.

AU - Palle, E.

AU - Berdinas, Z. M.

AU - Coleman, G. A. L.

AU - Diaz, 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-Escude, G.

AU - ., null

N1 - © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. This is the author’s version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science on 26 Jun 2020: Vol. 368, Issue 6498, pp. 1477-1481. DOI: https://doi.org/10.1126/science.aaz0795.

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.

KW - astro-ph.EP

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U2 - 10.1126/science.aaz0795

DO - 10.1126/science.aaz0795

M3 - Article

SN - 0036-8075

VL - 368

SP - 1477

EP - 1481

JO - Science

JF - Science

IS - 6498

ER -

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

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