| Issue |
A&A
Volume 578, June 2015
|
|
|---|---|---|
| Article Number | L4 | |
| Number of page(s) | 5 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361/201526176 | |
| Published online | 04 June 2015 | |
Mass of WASP-33b⋆
1 Thüringer Landessternwarte Tautenburg, 07778 Tautenburg, Germany
e-mail: lehm@tls-tautenburg.de
2 National Astronomical Research Institute of Thailand, 191 Huay Kaew Road, Muang, 50200 Chiangmai, Thailand
Received: 24 March 2015
Accepted: 16 April 2015
We analysed an extended time series of high-resolution spectra of the δ Sct star WASP-33 with the aim to determine the effect of its planet WASP-33b. We found ten frequencies in the measured radial velocities. Three of them we can attribute to previously observed photometric oscillations due to non-radial pulsations. One frequency exactly agrees with the orbital period of the planet. The semi-amplitude of the corresponding variation is 304 ± 20 m s-1. This finding allows us to give a new estimate of the mass of WASP-33b of 2.1 ± 0.2 Jupiter masses. Its mean density probably is at least 0.6 g cm-3, a value that can be expected for a planet of its mass that orbits an A-type star in 1.22 d.
Key words: planets and satellites: fundamental parameters / planets and satellites: gaseous planets / planetary systems / stars: variables: δScuti
Table 3 is available in electronic form at http://www.aanda.org
© ESO, 2015
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