# NGTS-5b: a highly inflated planet offering insights into the sub-Jovian desert

**Authors:** James McCormac, Maximiliano Moyano, Don Pollacco, Katja Poppenhaeger, Didier Queloz, Liam Raynard, Heike Rauer, Stéphane Udry, Simon. R. Walker, Christopher A. Watson, Richard G. West, Peter J. Wheatley, Philipp Eigmüller, Alexander Chaushev, Edward Gillen, Alexis Smith, Louise D. Nielsen, Oliver Turner, Szilard Czismadia, Barry Smalley  
**arXiv:** [1905.02593](https://arxiv.org/abs/1905.02593)  
**Date:** 2019-05-07  
**Summary page:** https://www.summarizepaper.com/en/paper/1905.02593v1/

## Key points

- Planetary populations provide insights into planet formation and evolution
- Sub-Jovian desert is a region of interest for short-period planets
- Next Generation Transit Survey (NGTS) detects short-period planets, particularly around M/K-type host stars
- Stellar parameters must be considered when comparing empirical data with model predictions
- NGTS-5b is a newly discovered planet at the boundary of the sub-Jovian desert
- NGTS light curve and spectroscopic follow-up observations were used to analyze its bulk properties and determine its mass, orbital period, and radius
- NGTS-5b is highly inflated compared to its size and has a mass that places it at the upper boundary of the sub-Jovian desert
- Importance of considering stellar parameters when analyzing planet populations in this region
- Empirical analysis must take into account stellar parameters for accurate comparisons with theoretical models.

## Summary

The study of planetary populations provides valuable insights into the formation and evolution processes of planets. In recent years, the sub-Jovian desert has been a topic of interest in relation to short-period planets. This region refers to the lack of gas giant planets with masses between 10-100 Earth masses and periods less than 10 days around Sun-like stars. The Next Generation Transit Survey (NGTS) is designed to detect short-period planets, particularly those orbiting M/K-type host stars. With high-precision photometric surveys such as NGTS and TESS, it is crucial to consider stellar parameters when comparing empirical data with model predictions. A newly discovered planet named NGTS-5b is presented at the boundary of the sub-Jovian desert in this study. The planet's bulk properties are analyzed using NGTS light curve and spectroscopic follow-up observations, and its mass is determined. NGTS-5b has an orbital period of 3.3569866 +- 0.0000026 days, a mass of 0.229 +- 0.037 MJup, and a radius of 1.136 +- 0.023 RJup, making it highly inflated compared to its size. Its mass places it at the upper boundary of the sub-Jovian desert and highlights the importance of considering stellar parameters when analyzing planet populations in this region. As NGTS and TESS continue to conduct red-sensitive surveys targeting late type stars, more planets are expected to be detected in this regime which emphasizes that an empirical analysis must take into account stellar parameters for accurate comparisons with theoretical models in order to gain deeper insights into planetary formation and evolution processes in our universe.