A Jupiter analogue and a cold Super-Neptune orbiting the solar-twin star HIP 104045

TL;DR

This paper reports the discovery of two exoplanets around a solar twin star, including a Jupiter-like planet and a cold Super-Neptune, using radial velocity data and advanced modeling techniques.

Contribution

It presents the first detection of a Jupiter analogue and a cold Super-Neptune orbiting a solar twin star with detailed modeling of stellar activity.

Findings

Discovery of a Jupiter analogue with 0.498 M_Jup at 2315-day orbit.

Detection of a cold Super-Neptune with 43.15 M_earth at 316-day orbit.

No significant activity-related radial velocity correlations found.

Abstract

We present the discovery of two planets around the solar twin HIP 104045 via radial velocity data obtained with the ESO/HARPS spectrograph as part of the Solar Twin Planet Search observing programme. The joint Keplerian and Gaussian Process model fit accounting for both planetary and intrinsic stellar modulations, as well as no timing-radial velocity correlations of several activity tracers of the host star, reveal the presence of a Jupiter analogue $m\sin{i}_b$ = 0.498$\pm$0.074 M$_{\rm Jup}$ under circular orbit with $P_b$ = 2315$\pm$310 days and a cold Super-Neptune $m\sin{i}_c$ = 43.15$\pm$10.3 M$_\oplus$ under circular orbit with $P_c$ = 316$\pm$75 days.