A Transiting “51 Peg–like” Planet
Open accessAbstract
Doppler measurements from Keck exhibit a sinusoidal periodicity in the velocities of the G0 dwarf HD 209458, having a semiamplitude of 81 m s-1 and a period of 3.5239 days, which is indicative of a "51 Peg-like" planet with a minimum mass (Msini) of 0.62 MJup and a semimajor axis of 0.046 AU. Follow-up photometry reveals a drop of 0.017 mag at the predicted time (within the errors) of transit by the companion based on the velocities. This is the first extrasolar planet observed to transit its star. The radius of the planet derived from the magnitude of the dimming is 1.42 RJup, which is consistent with models of irradiated Jupiter-mass planets. The transit implies that sini>0.993, leading to a true mass of 0.62 MJup for the planet. The resulting mean density of 0.27 g cm-3 implies that the companion is a gas giant.
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A number of hot Jupiters, including HD 209458b, have radii larger than expected from internal structure models.
“A number of hot Jupiters-including HD 209458b, the first hot Jupiter to be discovered to transit (Charbonneau et al. 2000, Henry et al. 2000)-have radii larger than expected from internal structure models.”
From Origins of Hot Jupiters (2018) · cites this paper as Henry et al. 2000
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Cites
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Research works printed but not linked: 5
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- Authors
- Henry, G. W., Marcy, G. W., Butler, R. P., & Vogt, S. S.
- Affiliations
- Tennessee State University (US)
- San Francisco State University (US)
- Carnegie Institution for Science (US)
- University of California, Santa Cruz (US)
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2000-01-20
- Volume
- 529
- Issue
- 1
- Pages
- L41-L44
- ISSN
- 0004-637X (ISSN-L)
- OpenAlex
- W2106779363
- Cited by
- 964
- References
- 1
- Citations by year
- 2026: 11 · 2025: 19 · 2024: 27 · 2023: 28 · 2022: 28 · 2021: 28 · 2020: 36 · 2019: 25 · 2018: 35 · 2017: 40 · 2016: 35 · 2015: 28 · 2014: 23 · 2013: 28 · 2012: 30
- FWCI
- 38.88
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- The Astrophysical Journal (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Science Foundation (9520443, 9706268, 9619418)
- National Aeronautics and Space Administration (NAG54445, HRD-9706268, NCC596)
- Carnegie Institution of Washington
- 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 › History and Developments in Astronomy
- Keywords
- HD 209458, transiting exoplanets, Doppler spectroscopy, planetary radius, planetary mass, mean density, transit photometry
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