K2-295 b and K2-237 b: two transiting hot Jupiters

Abstract

We report the discovery from K2 of two transiting hot Jupiter systems. K2-295 (observed in Campaign 8) is a K5 dwarf which hosts a planet slightly smaller than Jupiter, orbiting with a period of 4.0 d. We have made an independent discovery of K2-237 b (Campaign 11), which orbits an F6 dwarf every 2.2 d and has an inflated radius 50 - 60 per cent larger than that of Jupiter. We use high-precision radial velocity measurements, obtained using the HARPS and FIES spectrographs, to measure the planetary masses. We find that K2-295 b has a similar mass to Saturn, while K2-237 b is a little more massive than Jupiter.

arXiv comment26 pages, 12 figures, accepted for publication in Acta Astronomica

References in corpus (3)

• Investigating hot-Jupiter inflated radii with hierarchical Bayesian modelling
• High spatial resolution and high contrast optical speckle imaging with FASTCAM at the ORM
• Wavelet-based filter methods to detect small transiting planets in stellar light curves

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• TESS Timings of 31 Hot Jupiters with Ephemeris Uncertainties