Discovery and characterisation of two Neptune-mass planets orbiting HD 212729 with TESS

A new Neptune - mass planet orbiting HD 219828 ⋆

Two years ago a new benchmark for the planetary survey was set with the discoveries of three extrasolar planets with masses below 20M⊕. In particular, the serendipitous discovery of the 14M⊕ planet around µ Ara found with HARPS with a semi-amplitude of only 4 m s −1 put in evidence the tremendous potential of HARPS for the search of this class of very low-mass planets. Aiming to discovering new...

Two Earth - sized planets orbiting

Evolutionary Analysis of Gaseous Sub-neptune-mass Planets with Mesa

Sub-Neptune-sized exoplanets represent the most common types of planets in the Milky Way, yet many of their properties are unknown. Here, we present a prescription to adapt the capabilities of the stellar evolution toolkit Modules for Experiments in Stellar Astrophysics (MESA) to model sub-Neptune mass planets with H/He envelopes. With the addition of routines treating the planet core luminosit...

The Origin and Nature of Neptune-like Planets Orbiting Close to Solar Type Stars

The sample of known exoplanets is strongly biased to masses larger than the ones of the giant gaseous planets of the solar system. Recently, the discovery of two extrasolar planets of considerably lower masses around the nearby stars GJ 436 and ρ Cancri was reported. They are like our outermost icy giants, Uranus and Neptune, but in contrast, these new planets are orbiting at only some hundredt...

Probabilistic Mass–radius Relationship for Sub-neptune-sized Planets

The Kepler Mission has discovered thousands of planets with radii <4 Å R , paving the way for the first statistical studies of the dynamics, formation, and evolution of these sub-Neptunes and super-Earths. Planetary masses are an important physical property for these studies, and yet the vast majority of Kepler planet candidates do not have theirs measured. A key concern is therefore how to map...