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Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1
Open accessAbstract
One aim of modern astronomy is to detect temperate, Earth-like exoplanets that are well suited for atmospheric characterization. Recently, three Earth-sized planets were detected that transit (that is, pass in front of) a star with a mass just eight per cent that of the Sun, located 12 parsecs away. The transiting configuration of these planets, combined with the Jupiter-like size of their host star-named TRAPPIST-1-makes possible in-depth studies of their atmospheric properties with present-day and future astronomical facilities. Here we report the results of a photometric monitoring campaign of that star from the ground and space. Our observations reveal that at least seven planets with sizes and masses similar to those of Earth revolve around TRAPPIST-1. The six inner planets form a near-resonant chain, such that their orbital periods (1.51, 2.42, 4.04, 6.06, 9.1 and 12.35 days) are near-ratios of small integers. This architecture suggests that the planets formed farther from the star and migrated inwards. Moreover, the seven planets have equilibrium temperatures low enough to make possible the presence of liquid water on their surfaces.
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“Better understanding the impact of environmental limitations on the origin and early evolution of life, such as UV flux, can help determine the habitability of planetary bodies that are even outside our own solar system, such as planets around stars with high UV fluxes, e.g., the TRAPPIST-1 system (Gillon et al. 2017;O'Malley-James and Kaltenegger 2017).”
From Environmental Adaptation from the Origin of Life to the Last Universal Common Ancestor (2018) · cites this paper as Gillon et al. 2017
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Metadata
- Authors
- Gillon, M., Triaud, A. H. M. J., Demory, B.-O., Jehin, E., Agol, E., Deck, K. M., Lederer, S. M., de Wit, J., Burdanov, A., Ingalls, J. G., Bolmont, E., Leconte, J., Raymond, S. N., Selsis, F., Turbet, M., Barkaoui, K., Burgasser, A., Burleigh, M. R., Carey, S. J., Chaushev, A., Copperwheat, C. M., Delrez, L., Fernandes, C. S., Holdsworth, D. L., Kotze, E. J., Van Grootel, V., Almleaky, Y., Benkhaldoun, Z., Magain, P., & Queloz, D.
- Affiliations
- University of Liège (BE)
- University of Cambridge (GB)
- University of Bern (CH)
- NASA Astrobiology Institute (US)
- California Institute of Technology (US)
- National Aeronautics and Space Administration (US)
- Centre National de la Recherche Scientifique (FR)
- Cadi Ayyad University (MA)
- University of California San Diego (US)
- University of Leicester (GB)
- University of Lancashire (GB)
- South African Astronomical Observatory (ZA)
- King Abdulaziz University (SA)
- University of Geneva (CH)
- Corresponding author
- Gillon, Michaël
- ORCID
- Gillon, Michaël
- Triaud, Amaury H. M. J.
- Demory, Brice-Olivier
- Jehin, Emmanuël
- Agol, Eric
- Deck, Katherine M.
- Lederer, Susan M.
- Burdanov, Artem
- Ingalls, James G.
- Raymond, Sean N.
- Selsis, Franck
- Turbet, Martin
- Barkaoui, Khalid
- Burgasser, Adam
- Burleigh, Matthew R.
- Carey, Sean J.
- Delrez, Laetitia
- Holdsworth, Daniel L.
- Kotze, Enrico J.
- Benkhaldoun, Zouhair
- Queloz, Didier
- Venue
- Nature
- Published
- 2017-02
- Volume
- 542
- Issue
- 7642
- Pages
- 456-460
- ISSN
- 0028-0836 (ISSN-L)
- 1476-4687
- PMC
- PMC5330437
- OpenAlex
- W2590741408
- Cited by
- 1,555
- References
- 68
- Citations by year
- 2026: 55 · 2025: 106 · 2024: 129 · 2023: 124 · 2022: 131 · 2021: 121 · 2020: 251 · 2019: 207 · 2018: 260 · 2017: 164
- FWCI
- 131.91
- Type
- journal article
- Language
- en
- Open access
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Nature (publishedVersion)
- PubMed (publishedVersion)
- CLOK (University of Central Lancashire) (acceptedVersion)
- Liverpool John Moores University (acceptedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- arXiv (Cornell University) (submittedVersion)
- HAL (submittedVersion, other-oa)
- ORBi (University of Liège) (submittedVersion, other-oa)
- University of Birmingham Research Portal (University of Birmingham) (submittedVersion, cc-by-nc-nd)
- CaltechAUTHORS (California Institute of Technology) (submittedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- Bern Open Repository and Information System (University of Bern) (submittedVersion)
- eScholarship (California Digital Library) (submittedVersion)
- Figshare (submittedVersion)
- Leicester Research Archive (University of Leicester) (submittedVersion, other-oa)
- Oskar-Bordeaux (Universite de Bordeaux) (submittedVersion)
- arXiv (Cornell University)
- Funders
- National Science Foundation (1615315)
- National Aeronautics and Space Administration (NNX13AF62G)
- Agence Nationale de la Recherche (ANR-13-BS05-0003)
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (163967)
- Science and Technology Facilities Council (1362676, ST/L001306/1, ST/L00061X/1, ST/P006892/1, ST/N000757/1, ST/J001465/1, ST/M000966/1, ST/N001524/1, ST/P002218/1, ST/M003035/1)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Instrumentation › Astronomy and Astrophysical Research
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Space Science and Extraterrestrial Life
- Keywords
- TRAPPIST-1, exoplanets, Earth-sized planets, transit photometry, orbital resonance, planet migration, equilibrium temperature, habitability, liquid water, atmospheric characterization, planetary system architecture
- MeSH terms
- Extraterrestrial Environment, Temperature, Water, Planets, Exobiology, Stars, Celestial
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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