Cited by 840Stellar, planetary, and galactic studiesAstro and Planetary ScienceAstrophysics and Star Formation Studies

Optical Images of an Exosolar Planet 25 Light-Years from Earth

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Kalas, Paul, Graham, James R., Chiang, Eugene, Fitzgerald, Michael P., Clampin, Mark, Kite, Edwin S., Stapelfeldt, Karl, Marois, Christian +1 more·2008·Science

Abstract

Fomalhaut, a bright star 7.7 parsecs (25 light-years) from Earth, harbors a belt of cold dust with a structure consistent with gravitational sculpting by an orbiting planet. Here, we present optical observations of an exoplanet candidate, Fomalhaut b. Fomalhaut b lies about 119 astronomical units (AU) from the star and 18 AU of the dust belt, matching predictions of its location. Hubble Space Telescope observations separated by 1.73 years reveal counterclockwise orbital motion. Dynamical models of the interaction between the planet and the belt indicate that the planet's mass is at most three times that of Jupiter; a higher mass would lead to gravitational disruption of the belt, matching predictions of its location. The flux detected at 0.8 μm is also consistent with that of a planet with mass no greater than a few times that of Jupiter. The brightness at 0.6 μm and the lack of detection at longer wavelengths suggest that the detected flux may include starlight reflected off a circumplanetary disk, with dimension comparable to the orbits of the Galilean satellites. We also observe variability of unknown origin at 0.6 μm.

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Crossref · 10.1126/science.1166609

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Authors
Kalas, P., Graham, J. R., Chiang, E., Fitzgerald, M. P., Clampin, M., Kite, E. S., Stapelfeldt, K., Marois, C., & Krist, J.
Affiliations
California Institute of Technology (US)
Corresponding author
Kalas, Paul
Venue
Science
Published
2008-11-28
Volume
322
Issue
5906
Pages
1345-1348
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W2024605337
Cited by
840
References
20
Citations by year
2026: 4 · 2025: 10 · 2024: 10 · 2023: 21 · 2022: 7 · 2021: 13 · 2020: 27 · 2019: 20 · 2018: 34 · 2017: 35 · 2016: 66 · 2015: 46 · 2014: 70 · 2013: 89 · 2012: 84
FWCI
59.09
Type
journal article
Language
en
Open access
Locations
  • Science (publishedVersion)
  • PubMed (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
  • NASA STI Repository (National Aeronautics and Space Administration) (submittedVersion)
  • arXiv (Cornell University)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
Keywords
Fomalhaut b, exoplanet detection, Fomalhaut, debris disks, gravitational perturbations, orbital motion, planet mass limits, circumplanetary disks, reflected starlight, optical photometry, Hubble Space Telescope, dynamic modeling

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