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]

Qatar-4b
Discovery
Discovered byAlsubai et al. 2019
Transit
Orbital characteristics
0.02803 ± 0.00048 au
Eccentricity0
1.8053564 d
Inclination87.5 ± 1.6°
Semi-amplitude957±16 m/s
Physical characteristics
1.135 ± 0.11 RJ
Mass5.36 ± 0.20 MJ
Temperature1385 ± 50 K

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 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 five 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 it as a hot Jupiter, and is denser than Jupiter, with about 4 times the density. [3]

References

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  1. ^ "Astronomers discover three 'Qatar' exoplanets".
  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. arXiv:1908.06998. Bibcode:2019AJ....158..190H. doi:10.3847/1538-3881/ab3c56. ISSN 0004-6256. S2CID 201103951.
  3. ^ Alsubai, Khalid; et al. (2017). "Qatar Exoplanet Survey: Qatar-3b, Qatar-4b, and Qatar-5b". The Astronomical Journal. 153 (4). 200. arXiv:1606.06882. Bibcode:2017AJ....153..200A. doi:10.3847/1538-3881/aa6340. S2CID 119214858.