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Qatar-4 is a faint K-dwarf star that hosts a planet in the constellation Andromeda. With an apparent magnitude of 13.60, it is impossible to detect with the naked eye, but can be detected with a powerful telescope. Qatar-4 is currently located 1,083 light years away based on parallax.

Qatar-4
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Andromeda
Right ascension 00h 19m 26.22s[1]
Declination +44° 01′ 39.48″[1]
Apparent magnitude (V) 13.60[2]
Characteristics
Evolutionary stage main sequence star
Spectral type K1V
Variable type planetary transit
Astrometry
Proper motion (μ) RA: 0.985±0.031 mas/yr[1]
Dec.: −8.866±0.017 mas/yr[1]
Parallax (π)3.0105 ± 0.0263 mas[1]
Distance1,083 ± 9 ly
(332 ± 3 pc)
Details
Mass0.856+0.029
−0.030[3] M☉
Radius0.800+0.015
−0.014[3] R☉
Luminosity0.481[2] L☉
Surface gravity (log g)4.565+0.018
−0.020[3] cgs
Temperature5174+33
−35[3] K
Metallicity [Fe/H]0.095+0.076
−0.088[3] dex
Rotational velocity (v sin i)7.1±0.5[2] km/s
Age170±0.1[2] Myr
Other designations
Gaia DR2 385697172809355392, Qatar 4, UCAC3 269-3518
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

Properties


This star is a relatively young star with an age of only 170 million years. At this age, it is still on the main sequence. Qatar-4 has 89.6% the mass of the Sun, and 84.9% the latter's radius. Despite all of this, it only has 48.1% of the Sun's luminosity, which corresponds to an effective temperature of 5,120 K. Qatar-4 has a similar metallicity to the Sun, and rotates at a rate of 7.1 km/s.


Planetary system


In 2016, the Qatar Exoplanet Survey discovered a planet around this star.

The Qatar-4 planetary system[3]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 5.26+0.22
−0.21 MJ		 0.02861 1.80536494±9−7 0.046+0.064
−0.034		 87.5±1.6° 1.083+0.022
−0.021 RJ
Qatar-4b
Discovery[2]
Discovered byAlsubai et al. 2019
Detection method
Transit
Orbital characteristics
Semi-major axis
0.02803 ± 0.00048 au[2]
Eccentricity0[2]
Orbital period (sidereal)
1.8053564 d[2]
Inclination87.5 ± 1.6°[2]
Semi-amplitude957±16 m/s[2]
Physical characteristics
Mean radius
1.135 ± 0.11 RJ[2]
Mass5.36 ± 0.20 MJ[2]
Mean density
4.50 ± 1.00 g cm−3[2]
Temperature1385 ± 50 K[2]

    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).

    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.[4]

    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.


    See also



    References


    1. Gaia Collaboration (2018-04-01). "VizieR Online Data Catalog: Gaia DR2 (Gaia Collaboration, 2018)". VizieR Online Data Catalog. 1345. Bibcode:2018yCat.1345....0G.
    2. Alsubai, Khalid; Mislis, Dimitris; Tsvetanov, Zlatan I.; Latham, David W.; Bieryla, Allyson; Buchhave, Lars A.; Esquerdo, Gilbert A.; Bramich, D. M.; Pyrzas, Stylianos; Vilchez, Nicolas P. E.; Mancini, Luigi (2017-04-01). "Qatar Exoplanet Survey : Qatar-3b, Qatar-4b, and Qatar-5b" (PDF). The Astronomical Journal. 153 (4): 200. Bibcode:2017AJ....153..200A. doi:10.3847/1538-3881/aa6340. ISSN 0004-6256. S2CID 119214858.
    3. Wang, Xian-Yu; Wang, Yong-Hao; Wang, Songhu; Wu, Zhen-Yu; Rice, Malena; Zhou, Xu; Hinse, Tobias C.; Liu, Hui-Gen; Ma, Bo; Peng, Xiyan; Zhang, Hui; Yu, Cong; Zhou, Ji-Lin; Laughlin, Gregory (2021), Transiting Exoplanet Monitoring Project (TEMP). VI. The Homogeneous Refinement of System Parameters for 39 Transiting Hot Jupiters with 127 New Light Curves, arXiv:2105.14851
    4. 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.

    На других языках

    - [en] Qatar-4

    [ru] Катар-4

    Катар-4 (Qatar-4) — одиночная звезда в созвездии Андромеды на расстоянии приблизительно 1386 световых лет (около 425 парсеков) от Солнца. Вокруг звезды обращается, как минимум, одна планета.


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