# Detection and characterization of an ultra-dense sub-Neptune planet orbiting the Sun-like star HD 119130

Detection and characterization of an ultra-dense sub-Neptune planet orbiting the Sun-like star HD 119130
See arXiv version
Submitted to A&A; 9 pages, 8 figures, 4 tables

### Abstract

We present the discovery and characterization of a new transiting planet from Campaign 17 of the Kepler extended mission K2. HD 119130 b is a warm sub-Neptune on a 17-d orbit around a bright (V = 9.9 mag) solar-like G3 V star with a mass and radius of $$M_\star = 1.00\pm0.03\,\mathrm{M_\odot}$$ and $$R_\star = 1.09\pm0.03\,\mathrm{R_\odot}$$, respectively. We model simultaneously the K2 photometry and CARMENES spectroscopic data and derive a radius of $$R_\mathrm{p} = 2.63_{-0.10}^{+0.12}\,\mathrm{R_\oplus}$$ and mass of $$M_\mathrm{p} = 24.5_{-4.4}^{+4.4}\,\mathrm{M_\oplus}$$, yielding a mean density of $$\rho_\mathrm{p} = 7.4_{-1.5}^{+1.6}\,\mathrm{g\,cm^{-3}}$$, which makes it one of the densest sub-Neptune planets known to date. We also detect a linear trend in radial velocities of HD 119130 ($$\dot{\gamma}_{\rm RV}= -0.40^{+0.07}_{-0.07}\,\mathrm{m\,s^{-1}\,d^{-1}}$$) that suggests a long-period companion with a minimum mass on the order of $$33\,\mathrm{M_\oplus}$$. If confirmed, it would support a formation scenario of HD 119130 b by migration caused by Kozai-Lidov oscillations.