Qatar-4b

Short description: Super-Jupiter orbiting Qatar-4

Qatar-4bDiscovery

Discovered by| Alsubai et al. 2019

Detection method

| Transit
Orbital characteristics

Semi-major axis

| 0.02803 ± 0.00048 au
Eccentricity| 0
Orbital period| 1.8053564 d
Inclination| 87.5 ± 1.6°
Semi-amplitude| 957±16 m/s
Physical characteristics
Mean radius| 1.135 ± 0.11 RJ
Mass| 5.36 ± 0.20 MJ
Physics| 1385 ± 50 K

Qatar-4b is a Super-Jupiter orbiting the star Qatar-4 every 1.8 days. It was discovered in 2016 by the Qatar Exoplanet Survey (QES). [1]

This planet has a very short orbit, with only 1.8 days for it to complete an orbit around Qatar-4. The period corresponds with a separation of around 0.03 astronomical unit|AU, which is almost 20 times closer than Mercury is to the Sun. Despite that, it has a perfectly round orbit. Since the host is an active star, Qatar-4 may be destroyed by tidal waves from the star.[2]

Qatar-4b has over 5 times the mass of Jupiter. Despite this, it has a radius that is only 13.5% larger than the latter's. This planet has an effective temperature of 1,385 K, which classifies as a hot Jupiter, and is denser than Jupiter, with about 4 times the density. [3]

## References

1. ↑ "Astronomers discover three 'Qatar' exoplanets". http://phys.org/news/2016-06-astronomers-qatar-exoplanets.html.
2. ↑ Hamer, Jacob H.; Schlaufman, Kevin C. (2019-11-01). "Hot Jupiters Are Destroyed by Tides While Their Host Stars Are on the Main Sequence". The Astronomical Journal 158 (5): 190. doi:10.3847/1538-3881/ab3c56. ISSN 0004-6256. Bibcode: 2019AJ....158..190H.
3. ↑ Alsubai, Khalid et al. (2017). "Qatar Exoplanet Survey: Qatar-3b, Qatar-4b, and Qatar-5b". The Astronomical Journal 153 (4): 200. doi:10.3847/1538-3881/aa6340. Bibcode: 2017AJ....153..200A.

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