K2-113b: A dense hot-Jupiter transiting a solar analogue

TL;DR

K2-113b is a dense hot-Jupiter orbiting a solar analogue, with precise measurements of its mass, radius, and density, providing insights into its composition and the inflation mechanisms of hot Jupiters.

Contribution

This paper reports the discovery and characterization of K2-113b, a dense hot-Jupiter with detailed mass, radius, and density measurements, expanding knowledge of dense exoplanets.

Findings

K2-113b has a mass of approximately 1.29 M_J.

The planet's density is about 1.97 g/cm^3.

It likely contains over 110 Earth masses of heavy elements.

Abstract

We present the discovery of K2-113b, a dense hot-Jupiter discovered using photometry from Campaign 8 of the Kepler-2 (K2) mission and high-resolution spectroscopic follow up obtained with the FEROS spectrograph. The planet orbits a $V=13.68$ solar analogue in a $P=5.81760^{+0.00003}_{-0.00003}$ day orbit, has a radius of $0.93^{+0.10}_{-0.07}R_J$ and a mass of $1.29^{+0.13}_{-0.14}M_J$. With a density of $1.97^{+0.60}_{-0.53}$ gr/cm$^3$, the planet is among the densest systems known having masses below 2 $M_J$ and $T_{eq} > 1000$, and is just above the temperature limit at which inflation mechanisms are believed to start being important. Based on its mass and radius, we estimate that K2-113b should have a heavy element content on the order of $\sim$ 110 $M_{\oplus}$ or greater.