WASP-52
Star in the constellation Pegasus From Wikipedia, the free encyclopedia
WASP-52 is a K-type main-sequence star about 570 light-years away. It is older than the Sun at 10.7+1.9
−4.5 billion years, but it has a similar fraction of heavy elements.[3]
The star has prominent starspot activity, with 3% to 14% of the stellar surface covered by areas 575±150 K cooler than the rest of the photosphere.[6]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 23h 13m 58.7576s[1] |
| Declination | 08° 45′ 40.5713″[1] |
| Apparent magnitude (V) | 12.0 |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | K2V[2] |
| Astrometry | |
| Radial velocity (Rv) | −26.604[1] km/s |
| Proper motion (μ) | RA: −6.942[1] mas/yr Dec.: −44.330[1] mas/yr |
| Parallax (π) | 5.7262±0.0134 mas[1] |
| Distance | 570 ± 1 ly (174.6 ± 0.4 pc) |
| Details[3] | |
| Mass | 0.87±0.03 M☉ |
| Radius | 0.79±0.02 R☉ |
| Surface gravity (log g) | 4.58±0.01[4] cgs |
| Temperature | 5,000±100 K |
| Metallicity [Fe/H] | 0.03±0.12 dex |
| Rotation | 16±2 d[4] |
| Rotational velocity (v sin i) | 1.77+0.19 −0.20[5] km/s |
| Age | 10.7+1.9 −4.5 Gyr |
| Other designations | |
| Anadolu, Gaia EDR3 2666015878575546496, 2MASS J23135873+0845405[2] | |
| Database references | |
| SIMBAD | data |
A multiplicity survey in 2015 did not detect any stellar companions.[7] The star was named Anadolu in 2019 by Turkish astronomers as part of the NameExoWorlds contest.[8]
Planetary system
Summarize
Perspective
In 2012 a transiting hot Jupiter planet, WASP-52b, was detected in a tight, circular orbit.[4] The planet was named Göktürk by Turkish astronomers in December 2019.[8] The planet has a small measured temperature difference between dayside (1481±34 K) and nightside (1224±77 K).[9] Planetary orbit is well aligned with the equatorial plane of the star, the misalignment being 5.47+4.61
−4.21°.[5]
Search for transit timing variation did not result in detection of additional planets in system as in 2021.[10]
A transmission spectrum taken in 2020 has revealed the presence of hydrogen, sodium and potassium,[11] although the sodium and potassium lines may be attributable to volcanically active moons of the gas giant, not the planet itself.[12] The atmosphere has no high winds and relatively low-lying clouds, indicating it is not significantly enriched by heavy elements.[13] No signs of the planetary atmosphere escaping to space were detected in 2020,[14] but updated measurement in 2022 showed signs of helium escape, consistent with mass loss rate of 0.5% per billion years.[15]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| WASP-52b (Göktürk) | 0.459+0.022 −0.021 MJ |
0.02713+0.00031 −0.00032 |
1.7497835±0.0000011 | <0.092 | 85.35±0.20° | 1.27±0.03 RJ |
References
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