Volume 578, June 2015
|Number of page(s)||5|
|Published online||04 June 2015|
Mass of WASP-33b⋆
1 Thüringer Landessternwarte Tautenburg, 07778 Tautenburg, Germany
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.