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K2-295 b and K2-237 b: Two Transiting Hot Jupiters

Smith A. M. S., Csizmadia Sz., Gandolfi D., Albrecht S., Alonso R., Barragán O., Cabrera J., Cochran W. D., Dai F., Deeg H., Eigmüller Ph., Endl M., Erikson A., Fridlund M., Fukui A., Grziwa S., Guenther E. W., Hatzes A. P., Hidalgo D., Hirano T., Korth J., Kuzuhara M., Livingston J., Narita N., Nespral D., Niraula P., Nowak G., Palle E., Pätzold M., Persson C. M., Prieto-Arranz J., Rauer H., Redfield S., Ribas I., Van Eylen V.

Acta Astronomica

2019

Vol. 69, No. 2

135--158

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 F9 dwarf every 2.2 d and has an inflated radius 60-70% 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.

The Properties of XO-5b and WASP-82b Redetermined Using New High-Precision Transit Photometry and Global Data Analyses

Smith A. M. S.

Acta Astronomica

2015

Vol. 65, No. 1

117--125

This paper presents new transit photometry from the Isaac Newton Telescope of two transiting exoplanetary systems, XO-5 and WASP-82. In each case the new transit light curve is more precise than any other of that system previously published. The new data are analyzed alongside previously-published photometry and radial velocities, resulting in an improved orbital ephemeris and a refined set of system parameters in each case. The observational baseline of XO-5 is extended by very nearly four years, resulting in a determination of the orbital period of XO-5b to a precision of just 50 ms. The mass and radius of XO-5b are 1.19±0.03 and 1.14±0.03 times those of Jupiter, respectively. The light curve of WASP-82 is only the second published for this system. The planetary mass is 1.25±0.05 MJup, and the radius is 1.71±0.08 RJup.