This book is a compendium of key scientific questions, challenges, and opportunities across different areas of exoplanetary science. The field is currently experiencing rapid growth, and the book provides a front-row view of the advancements at the cutting-edge of the field. Each chapter contains a short exposition on the most important open questions, challenges, and opportunities in a specific area from the perspective of one or more top experts in the area. It provides a starting point for researchers, experts and non-experts alike, to obtain a quick overview of the forefront of exoplanetary science and a vision for the future of the field. Topics range from observational developments and techniques, including exoplanet detection and characterisation methods and state-of-the-art and future missions, to exoplanet theory and modelling including planet formation, planetary interiors, atmospheres, habitability and the search for life.

PrefacePart I: Introduction 1. The Exoplanetary LandscapePart II: Exoplanetary Detection and Spectroscopy 2. The Demographics of Exoplanets 3. Transit Surveys 4. Radial Velocity Surveys 5. Direct Imaging and Spectroscopy 6. Small Star Opportunities 7. Transit Spectroscopy 8. High-resolution Spectroscopy 9. Space Missions for Exoplanet Science 10. Small Satellites for Exoplanet SciencePart III: Exoplanetary Theory and Characterisation 11. Orbital Dynamics and Architectures of Exoplanets 12. Planet Formation 13. Planetary Migration 14. Astrochemistry and Planet Formation 15. Debris Disks 16. Exoplanetary Interiors 17. Atmospheric Modeling and Retrieval 18. Atmospheric Chemistry 19. Atmospheric Dynamics 20. Clouds in Exoplanetary Atmospheres 21. Atomic and Molecular Line dataPart IV: Habitability and Biosignatures 22. Exoplanetary Habitability 23. Exoplanetary Astrobiology Part V: New Horizons 24. The Search for Spectroscopic Signs of Life