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WASP-64 b and WASP-72 b : two new transiting highly irradiated giant planets

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Date
04/2013
Author
Gillon, M.
Anderson, D. R.
Collier-Cameron, A.
Doyle, A. P.
Fumel, A.
Hellier, C.
Jehin, E.
Lendl, M.
Maxted, P. F. L.
Montalban, J.
Pepe, F.
Pollacco, D.
Queloz, D.
Segransan, D.
Smith, A. M. S.
Smalley, B.
Southworth, J.
Triaud, A. H. M. J.
Udry, S.
West, R. G.
Keywords
Planetary systems
WASP-64
Photometric
Radial velocities
Spectroscopic
WASP-72
QB Astronomy
Metadata
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Abstract
We report the discovery by the WASP transit survey of two new highly irradiated giant planets. WASP-64 b is slightly more massive (1.271 +/- 0.068 M-Jup) and larger (1.271 +/- 0.039 R-Jup) than Jupiter, and is in very-short (a = 0.02648 +/- 0.00024 AU, P = 1.5732918 +/- 0.0000015 days) circular orbit around a V = 12.3 G7-type dwarf (1.004 +/- 0.028 M-circle dot, 1.058 +/- 0.025 R-circle dot, T-eff = 5500 +/- 150 K). Its size is typical of hot Jupiters with similar masses. WASP-72 b has also a mass a bit higher than Jupiter's (1.461(-0.056)(+0.059) M-Jup) and orbits very close (0.03708 +/- 0.00050 AU, P = 2.2167421 +/- 0.0000081 days) to a bright (V = 9.6) and moderately evolved F7-type star (1.386 +/- 0.055 M-circle dot, 1.98 +/- 0.24 R-circle dot, T-eff = 6250 +/- 100 K). Despite its extreme irradiation (similar to 5.5 x 10(9) erg s(-1) cm(-2)), WASP-72 b has a moderate size (1.27 +/- 0.20 R-Jup) that could suggest a significant enrichment in heavy elements. Nevertheless, the errors on its physical parameters are still too high to draw any strong inference on its internal structure or its possible peculiarity.
Citation
Gillon , M , Anderson , D R , Collier-Cameron , A , Doyle , A P , Fumel , A , Hellier , C , Jehin , E , Lendl , M , Maxted , P F L , Montalban , J , Pepe , F , Pollacco , D , Queloz , D , Segransan , D , Smith , A M S , Smalley , B , Southworth , J , Triaud , A H M J , Udry , S & West , R G 2013 , ' WASP-64 b and WASP-72 b : two new transiting highly irradiated giant planets ' , Astronomy & Astrophysics , vol. 552 , A82 . https://doi.org/10.1051/0004-6361/201220561
Publication
Astronomy & Astrophysics
Status
Peer reviewed
DOI
https://doi.org/10.1051/0004-6361/201220561
ISSN
0004-6361
Type
Journal article
Rights
Copyright ESO 2013.
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/3996

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