HAT-P-27b: A hot Jupiter transiting a G star on a 3 day orbit

TL;DR

This paper reports the discovery and characterization of HAT-P-27b, a hot Jupiter exoplanet orbiting a G star with a 3-day period, providing detailed stellar and planetary parameters and analyzing correlations with host star metallicity and temperature.

Contribution

It presents the discovery and detailed analysis of HAT-P-27b, including its orbital, stellar, and planetary properties, and confirms correlations between host star metallicity, temperature, and planetary radius.

Findings

HAT-P-27b has a 3-day orbit around a G star.

Confirmed negative correlation between host star metallicity and planetary radius.

Identified dependence of planetary radius on equilibrium temperature.

Abstract

We report the discovery of HAT-P-27b, an exoplanet transiting the moderately bright G8 dwarf star GSC 0333-00351 (V=12.214). The orbital period is 3.039586 +/- 0.000012 d, the reference epoch of transit is 2455186.01879 +/- 0.00054 (BJD), and the transit duration is 0.0705 +/- 0.0019 d. The host star with its effective temperature 5300 +/- 90 K is somewhat cooler than the Sun, and is more metal-rich with a metallicity of +0.29 +/- 0.10. Its mass is 0.94 +/- 0.04 Msun and radius is 0.90 +/- 0.04 Rsun. For the planetary companion we determine a mass of 0.660 +/- 0.033 MJ and radius of 1.038 +0.077 -0.058 RJ. For the 30 known transiting exoplanets between 0.3 MJ and 0.8 MJ, a negative correlation between host star metallicity and planetary radius, and an additional dependence of planetary radius on equilibrium temperature are confirmed at a high level of statistical significance.