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[1] mas/yr Dec.: −8.866±0.017[1] mas/yr |
Parallax (π) | 3.0105 ± 0.0263[1] mas |
Distance | 1,083 ± 9 ly (332 ± 3 pc) |
Details | |
Mass | 0.856+0.029 −0.030[3] M☉ |
Radius | 0.800+0.015 −0.014[3] R☉ |
Luminosity | 0.481[2] L☉ |
Surface gravity (log g) | 4.565+0.018 −0.020[3] cgs |
Temperature | 5174+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 |
Age | 170±0.1[2] Myr |
Other designations | |
Gaia DR2 385697172809355392, Qatar 4, UCAC3 269-3518 | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
Extrasolar Planets Encyclopaedia | data |
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.
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.
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 |
Discovery[2] | |
---|---|
Discovered by | Alsubai et al. 2019 |
Detection method | Transit |
Orbital characteristics | |
Semi-major axis | 0.02803 ± 0.00048 au[2] |
Eccentricity | 0[2] |
Orbital period | 1.8053564 d[2] |
Inclination | 87.5 ± 1.6°[2] |
Semi-amplitude | 957±16 m/s[2] |
Physical characteristics | |
Mean radius | 1.135 ± 0.11 RJ[2] |
Mass | 5.36 ± 0.20 MJ[2] |
Mean density | 4.50 ± 1.00 g cm−3[2] |
Temperature | 1385 ± 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[]
- ^ a b c d Gaia Collaboration (2018-04-01). "VizieR Online Data Catalog: Gaia DR2 (Gaia Collaboration, 2018)". VizieR Online Data Catalog. 1345. Bibcode:2018yCat.1345....0G.
- ^ a b c d e f g h i j k l m n 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.
- ^ a b c d e f 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
- ^ 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.
- Andromeda (constellation)
- K-type main-sequence stars
- Planetary transit variables
- Planetary systems with one confirmed planet