WASP-52

WASP-52, also named Anadolu, is a K-type main-sequence star about 570 light-years away in the constellation Pegasus. It is older than the Sun at 10.7+1.9
−4.5 billion years, but it has a similar fraction of heavy elements.[1] 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.[2]

A multiplicity survey in 2015 did not detect any stellar companions.[3]

## Nomenclature

The designation WASP-52 comes from the Wide Angle Search for Planets.

This was one of the systems selected to be named in the 2019 NameExoWorlds campaign during the 100th anniversary of the IAU, which assigned each country a star and planet to be named. This system was assigned to Turkey. The approved names were Anadolu for the star, after the Turkish name for Anatolia, and Göktürk for the planet after the Göktürks, a historical group of Turkic people.[4][5]

## Planetary system

In 2012 a transiting hot Jupiter planet, WASP-52b, was detected in a tight, circular orbit.[6] The planet was named Göktürk by Turkish astronomers in December 2019.[5] The planet has a small measured temperature difference between dayside (1481±34 K) and nightside (1224±77 K).[7] The planetary orbit is well aligned with the equatorial plane of the star, the misalignment being 5.47+4.61−4.21°.[8]

Search for transit timing variation did not result in the detection of additional planets in system as of 2021.[9]

A transmission spectrum taken in 2020 has revealed the presence of hydrogen, sodium and potassium,[10] although the sodium and potassium lines may be attributable to volcanically active moons of the gas giant, not the planet itself.[11] The atmosphere has no high winds and relatively low-lying clouds, indicating it is not significantly enriched by heavy elements.[12] No signs of the planetary atmosphere escaping to space were detected in 2020,[13] but updated measurement in 2022 showed signs of helium escape, consistent with mass loss rate of 0.5% per billion years.[14]

The WASP-52 planetary system[1] Companion
(in order from star) | Mass | Semimajor axis
(AU) | Orbital period
(days) | Eccentricity | Inclination | Radius

|
|
|
|
|
|

b (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

1. ↑ 1.0 1.1 Bonomo, A. S.; Desidera, S.; Benatti, S.; Borsa, F.; Crespi, S.; Damasso, M.; Lanza, A. F.; Sozzetti, A. et al. (2017), "The GAPS Programme with HARPS-N@TNG XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets", Astronomy & Astrophysics A107: 602, doi:10.1051/0004-6361/201629882, Bibcode: 2017A&A...602A.107B
2. ↑ Rosich, A.; Herrero, E.; Mallonn, M.; Ribas, I.; Morales, J. C.; Perger, M.; Anglada-Escudé, G.; Granzer, T. (2020), "Correcting for chromatic stellar activity effects in transits with multiband photometric monitoring: Application to WASP-52", Astronomy and Astrophysics 641: A82, doi:10.1051/0004-6361/202037586, Bibcode: 2020A&A...641A..82R
3. ↑ Wöllert, Maria; Brandner, Wolfgang; Bergfors, Carolina; Henning, Thomas (2015), "A Lucky Imaging search for stellar companions to transiting planet host stars", Astronomy & Astrophysics 575: A23, doi:10.1051/0004-6361/201424091, Bibcode: 2015A&A...575A..23W
4. ↑ "Approved names". IAU. https://nameexoworlds.iau.org/final-results.
5. ↑ 5.0 5.1 'Anadolu' and 'Göktürk': Turkey names its star and planet
6. ↑ Hébrard, G.; Collier Cameron, A.; Brown, D. J. A.; Díaz, R. F.; Faedi, F.; Smalley, B.; Anderson, D. R.; Armstrong, D. et al. (2012), "WASP-52b, WASP-58b, WASP-59b, and WASP-60b: four new transiting close-in giant planets", Astronomy & Astrophysics 549: A134, doi:10.1051/0004-6361/201220363
7. ↑ May, E. M.; Stevenson, K. B.; Bean, Jacob L.; Bell, Taylor J.; Cowan, Nicolas B.; Dang, Lisa; Desert, Jean-Michel; Fortney, Jonathan J. et al. (2022), "A New Analysis of Eight Spitzer Phase Curves and Hot Jupiter Population Trends: Qatar-1b, Qatar-2b, WASP-52b, WASP-34b, and WASP-140b", The Astronomical Journal 163 (6): 256, doi:10.3847/1538-3881/ac6261, Bibcode: 2022AJ....163..256M
8. ↑ Oshagh, M.; Triaud, A. H. M. J.; Burdanov, A.; Figueira, P.; Reiners, Ansgar; Santos, N. C.; Faria, J.; Boue, G. et al. (2018), "Activity induced variation in spin-orbit angles as derived from Rossiter-McLaughlin measurements", Astronomy & Astrophysics 619: A150, doi:10.1051/0004-6361/201833709, Bibcode: 2018A&A...619A.150O
9. ↑ Sonbas, E.; Karaman, N.; Özdönmez, A.; Er, H.; Dhuga, K. S.; Göğüş, E.; Nasiroglu, I.; Zejmo, M. (2022), "Probing Transit Timing Variations of three hot Jupiters: HATP-36b, HATP-56b, and WASP-52b", Monthly Notices of the Royal Astronomical Society 509 (4): 5102–5116, doi:10.1093/mnras/stab3270
10. ↑ Chen, G.; Casasayas-Barris, N.; Pallé, E.; Yan, F.; Stangret, M.; Cegla, H. M.; Allart, R.; Lovis, C. (2020), "Detection of Na, K, and Hα absorption in the atmosphere of WASP-52b using ESPRESSO", Astronomy & Astrophysics 635: A171, doi:10.1051/0004-6361/201936986, Bibcode: 2020A&A...635A.171C
11. ↑ Oza, Apurva V.; Johnson, Robert E.; Lellouch, Emmanuel; Schmidt, Carl; Schneider, Nick; Huang, Chenliang; Gamborino, Diana; Gebek, Andrea et al. (2019), "Sodium and Potassium Signatures of Volcanic Satellites Orbiting Close-in Gas Giant Exoplanets", The Astrophysical Journal 885 (2): 168, doi:10.3847/1538-4357/ab40cc, Bibcode: 2019ApJ...885..168O
12. ↑ Bruno, Giovanni; Lewis, Nikole K.; Alam, Munazza K.; López-Morales, Mercedes; Barstow, Joanna K.; Wakeford, Hannah R.; Sing, David K.; Henry, Gregory W. et al. (2020), "WASP-52b. The effect of starspot correction on atmospheric retrievals", Monthly Notices of the Royal Astronomical Society 491 (4): 5361–5375, doi:10.1093/mnras/stz3194, Bibcode: 2020MNRAS.491.5361B
13. ↑ Vissapragada, Shreyas; Knutson, Heather A.; Jovanovic, Nemanja; Harada, Caleb K.; Oklopčić, Antonija; Eriksen, James; Mawet, Dimitri; Millar-Blanchaer, Maxwell A. et al. (2020), "Constraints on Metastable Helium in the Atmospheres of WASP-69b and WASP-52b with Ultra-Narrowband Photometry", The Astronomical Journal 159 (6): 278, doi:10.3847/1538-3881/ab8e34, Bibcode: 2020AJ....159..278V
14. ↑ Kirk, James; Dos Santos, Leonardo A.; López-Morales, Mercedes; Alam, Munazza K.; Oklopčić, Antonija; MacLeod, Morgan; Zeng, Li; Zhou, George (2022), "Keck/NIRSPEC Studies of He i in the Atmospheres of Two Inflated Hot Gas Giants Orbiting K Dwarfs: WASP-52b and WASP-177b", The Astronomical Journal 164 (1): 24, doi:10.3847/1538-3881/ac722f, Bibcode: 2022AJ....164...24K

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Coordinates:  23h 13m 58.7576s, +08° 45′ 40.5713″

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Stars of Pegasus

Bayer|

* α (Markab)
* β (Scheat)
* γ (Algenib)
* ε (Enif)
* ζ (Homam)
* η (Matar)
* θ (Biham)
* ι
* κ
* λ
* μ (Sadalbari)
* ν
* ξ
* ο
* π1
* π2
* ρ
* σ
* τ (Salm)
* υ (Alkarab)
* φ
* χ
* ψ

Flamsteed|

* 1
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* 3
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* 7
* 9
* 11
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* 28
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* 34
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* 37
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* 45
* 51 (Helvetios)
* 52
* 55
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* 23 Psc
* 34 Vul

Variable|

* R
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* RU
* RV
* RZ
* SV
* TW
* TY
* AG
* AQ
* AT
* AU
* AV
* AW
* BB
* BH
* BK
* BO
* BP
* BX
* BY
* DH
* DI
* DY
* EE
* EF
* EQ
* EZ
* GT
* GX
* HN
* HO
* HP
* HR
* HX
* II
* IK
* IM
* IP
* KT
* KU
* LL
* LO
* LS
* MS
* MT
* NV
* NZ
* OY
* PT
* V342
* V343
* V354
* V363
* V372
* V376
* V391

HR|

* 19
* 49
* 8116
* 8219
* 8221
* 8231
* 8250
* 8257
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* 8274
* 8292
* 8325
* 8341
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* 8824
* 8831
* 8833
* 8838
* 8839
* 8873
* 8922
* 8942
* 8953
* 8970
* 9039
* 9055
* 9078
* 9109

HD|

* 434
* 204603
* 205011
* 205422
* 205603
* 206689
* 206793
* 208897
* 209709
* 210890
* 211076
* 213025
* 215549
* 215733
* 219196
* 219828
* 220288
* 220773
* 221170
* 221493
* 225292

Gliese|

* Gliese 829
* Gliese 880

Other|

* BD+14 4559
* BD +17 4708
* BD +28 4211
* GD 246
* HAT-P-8
* NGC 8
* NGC 18
* NGC 30
* PG 2131+066
* PG 2303+243
* PSR B2127+11C
* PSR B2303+30
* WASP-10
* WASP-21
* WASP-52
* WASP-59
* WASP-60
* X2127+119

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