55 Cancri (Copernicus): A Multi-Planet System with a Hot Super-Earth and a Jupiter Analogue

TL;DR

The paper discusses the 55 Cancri system, highlighting its diverse planets including a hot super-Earth and a Jupiter analogue, and emphasizing its significance for exoplanet studies.

Contribution

It provides a comprehensive overview of the multi-planet system 55 Cancri, including orbital dynamics, planet characteristics, and implications for exoplanet detection methods.

Findings

Planets b and c are in near 1:3 resonance.

Planet d has a 14.5-year orbit, one of the longest for a gas giant.

Planet e transits and has a mass of 8 M?.

Abstract

The star 55 Cancri was one of the first known exoplanet hosts and each of the planets in this system is remarkable. Planets b and c are in a near 1:3 resonance. Planet d has a 14.5 year orbit, and is one of the longest known orbital periods for a gas giant planet. Planet e has a mass of 8 M? and transits this bright star, providing a unique case for modeling of the interior structure and atmospheric composition of an exoplanet. Planet f resides in the habitable zone of the star. If the planets are approximately co-planar, then by virtue of having one transiting planet, this is a system where the Doppler technique has essentially measured the true mass of the planets, rather than just Msin i. The unfolding history of planet discovery for this system provides a good example of the challenges and importance of understanding the star to understand the planets.