WASP-4b: A 12th Magnitude Transiting Hot Jupiter in the Southern Hemisphere
Open accessAbstract
We report the discovery of WASP-4b, a large transiting gas-giant planet with an orbital period of 1.34 days. This is the first planet to be discovered by the SuperWASP-South observatory and CORALIE collaboration and the first planet orbiting a star brighter than 16th magnitude to be discovered in the southern hemisphere. A simultaneous fit to high-quality light curves and precision radial velocity measurements leads to a planetary mass of 1.22 + 0.09 −0.08 M Jup and a planetary radius of 1.42 + 0.07 −0.04 R Jup . The host star is USNO-B1.0 0479–0948995, a G7 V star of visual magnitude 12.5. As a result of the short orbital period, the predicted surface temperature of the planet is 1761 K, making it an ideal candidate for detections of the secondary eclipse at infrared wavelengths.
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Orbital Decay Candidates Reconsidered: WASP-4 b Is Not Decaying and Kepler-1658 b Is Not a Planet
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Influential
- Authors
- Wilson, D. M., Gillon, M., Hellier, C., Maxted, P. F. L., Pepe, F., Queloz, D., Anderson, D. R., Collier Cameron, A., Smalley, B., Lister, T. A., Bentley, S. J., Blecha, A., Christian, D. J., Enoch, B., Haswell, C. A., Hebb, L., Horne, K., Irwin, J., Joshi, Y. C., Kane, S. R., Marmier, M., Mayor, M., Parley, N., Pollacco, D., Pont, F., Ryans, R., Segransan, D., Skillen, I., Street, R. A., Udry, S., West, R. G., & Wheatley, P. J.
- Affiliations
- Keele University (GB)
- University of Liège (BE)
- Las Cumbres Observatory Global Telescope Network (US)
- Queen's University Belfast (GB)
- The Open University (GB)
- University of St Andrews (GB)
- Harvard University (US)
- California Institute of Technology (US)
- Isaac Newton Group (ES)
- University of Leicester (GB)
- University of Warwick (GB)
- ORCID
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2008-02-05
- Volume
- 675
- Issue
- 2
- Pages
- L113-L116
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2167901369
- Cited by
- 140
- References
- 19
- Citations by year
- 2026: 2 · 2025: 4 · 2024: 1 · 2023: 6 · 2022: 9 · 2021: 4 · 2020: 5 · 2019: 12 · 2018: 2 · 2017: 7 · 2015: 5 · 2014: 4 · 2013: 9 · 2012: 11
- FWCI
- 11.27
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- The Astrophysical Journal (publishedVersion)
- Open Research Online (The Open University) (acceptedVersion)
- arXiv (Cornell University) (submittedVersion)
- CaltechAUTHORS (California Institute of Technology) (submittedVersion)
- Leicester Research Archive (University of Leicester) (submittedVersion)
- Open Repository and Bibliography (University of Liège) (submittedVersion, other-oa)
- Research Portal (Queen's University Belfast) (submittedVersion)
- California State University ScholarWorks (system-wide DSpace) (submittedVersion)
- arXiv (Cornell University)
- Funders
- Queen's University Belfast
- Queen's University
- Science and Technology Facilities Council (PP/F000065/1, PP/D000890/1, PP/F000057/1, PP/D000955/1, PP/D000963/1)
- 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 › History and Developments in Astronomy
- Keywords
- hot Jupiters, transiting exoplanets, CORALIE, radial velocity, light curve fitting, planetary mass, planetary radius, G dwarf host star, secondary eclipse, infrared spectroscopy
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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