Observing exoplanets from the planet Earth: how our revolution around the Sun affects the detection of 1-year periods

TL;DR

This paper investigates how Earth's annual motion influences the detection of exoplanets with ~1-year orbital periods, highlighting the impact of spectral window effects and suggesting observational improvements.

Contribution

It analyzes the spectral window effects on exoplanet detection near 1-year periods and identifies cases needing further observation for reliable orbital solutions.

Findings

Spectral window effects cause aliasing in 1-year period detections.

Certain exoplanet signals are affected by Earth's orbital motion, impacting data reliability.

Additional observations can significantly improve orbital parameter accuracy.

Abstract

We analysed a selected sample of exoplanets with orbital periods close to 1 year to study the effects of the spectral window on the data, affected by the 1 cycle/year aliasing due to the Earth motion around the Sun. We pointed out a few cases where a further observational effort would largely improve the reliability of the orbital solutions.