An extremely high photometric precision in ground-based observations of two transits in the WASP-50 planetary system

Tregloan-Reed, Jeremy; Southworth, John

Abstract

We present photometric observations of two transits in the WASP-50 planetary system, obtained using the ESO New Technology Telescope and the defocused-photometry technique. The rms scatters for the two data sets are 258 and 211 ppm with a cadence of 170–200 s, setting a new record for ground-based photometric observations of a point source. The data were modelled and fitted using the PRISM and GEMC codes, and the physical properties of the system calculated. We find the mass and radius of the hot star to be 0.861 ± 0.057 M⊙ and 0.855 ± 0.019 R⊙, respectively. For the planet we find a mass of 1.437 ± 0.068 MJup, a radius of 1.138 ± 0.026 RJup and a density of 0.911 ± 0.033 ρJup. These values are consistent with but more precise than those found in the literature. We also obtain a new orbital ephemeris for the system: T0 = BJD/TDB 245 5558.612 37 (20) + 1.955 0938(13) × E.

Citation

Tregloan-Reed, J., & Southworth, J. (2013). An extremely high photometric precision in ground-based observations of two transits in the WASP-50 planetary system. Monthly Notices of the Royal Astronomical Society, 431(1), 966-971. https://doi.org/10.1093/mnras/stt227

• Journal Article Type: Article
• Online Publication Date: Mar 6, 2013
• Publication Date: May 1, 2013
• Deposit Date: Jun 14, 2023
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 431
• Issue: 1
• Pages: 966-971
• DOI: https://doi.org/10.1093/mnras/stt227
• Keywords: Space and Planetary Science; Astronomy and Astrophysics