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WASP-4b: A 12th magnitude transiting hot Jupiter in the southern hemisphere

Wilson, D. M. and Gillon, M. and Hellier, C. and Maxted, P. F. L. and Pepe, F. and Queloz, D. and Anderson, D. R. and Collier Cameron, A. and Smalley, B. and Lister, T. A. and Bentley, S. J. and Blecha, A. and Christian, D. J. and Enoch, B. and Haswell, C. A. and Hebb, L. and Horne, K. and Irwin, J. and Joshi, Y. C. and Kane, S. R. and Marmier, M. and Mayor, M. and Parley, N. and Pollacco, D. and Pont, F. and Ryans, R. and Segransan, D. and Skillen, I. and Street, R. A. and Udry, S. and West, R. G. and Wheatley, P. J. (2008) WASP-4b: A 12th magnitude transiting hot Jupiter in the southern hemisphere. Astrophysical Journal Letters, 675 (2). L113-L116. ISSN 2041-8205.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Wilson, D. M.0000-0001-6002-423X
Gillon, M.0000-0003-1462-7739
Queloz, D.0000-0002-3012-0316
Collier Cameron, A.0000-0002-8863-7828
Hebb, L.0000-0003-1263-8637
Kane, S. R.0000-0002-7084-0529
Pont, F.0000-0003-0076-5444
Street, R. A.0000-0001-6279-0552
Wheatley, P. J.0000-0003-1452-2240
Additional Information:© 2008. The American Astronomical Society. Received 2007 November 22; accepted 2008 January 30; published 2008 February 5. The WASP Consortium includes the Universities of Keele, Leicester, and St. Andrews, Queen’s University Belfast, the Open University, and the Isaac Newton Group. WASP-S is hosted by the South African Astronomical Observatory (SAAO), and we are grateful for their support and assistance. Funding for WASP comes from Consortium Universities and the UK’s Science and Technology Facilities Council.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Consortium UniversitiesUNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Subject Keywords:planetary systems, stars: individual (WASP-4)
Issue or Number:2
Record Number:CaltechAUTHORS:20090727-142747868
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14678
Deposited By: Ruth Sustaita
Deposited On:12 Aug 2009 20:34
Last Modified:09 Mar 2020 13:19

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