WASP-64

WASP-64, also named Atakoraka, is a star about 1,177 light-years away in the constellation Canis Major. It is a G7 class main-sequence star, orbited by a planet WASP-64b. It is younger than the Sun at 3.6±1.6 billion years,[1] and it has a metal abundance similar to the Sun.[2] The star is rotating rapidly, being spun up by the giant planet in a close orbit.[1]

While an imaging survey in 2017 failed to find any stellar companions,[3] a 2019 survey using Gaia DR2 data found WASP-64 to be the secondary component of a double star system, with a wide separation of 24.2 arcseconds or 9,058 AU.[4] The primary star is designated TYC 7091-1288-1, and can also be called WASP-64 A, with the planet host being WASP-64 B.[5][6] Although the stars share a similar distance and common proper motion, their relative space velocity appears to be high enough that the pair are not gravitationally bound.[4]

## Nomenclature

The designation WASP-64 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 Togo. The approved names were Atakoraka for the star after the Atacora, the largest mountain range in Togo, and Agouto for the planet after Mount Agou, the highest mountain in Togo.[7]

## Planetary system

A transiting hot Jupiter exoplanet orbiting WASP-64 was discovered by WASP in 2012.[2] The planetary equilibrium temperature is 1672+59−63 K,[2] while the measured dayside temperature is hotter at 1989+87−88 K.[8] Due to the close proximity of the planet to the parent star, orbital decay of WASP-64b, along with HATS-2, may be detectable in the near future.[9] WASP-64b was named Agouto (after Mount Agou, the highest point of Togo which lies within the Atacora chain) in 2019 by amateur astronomers from Togo as part of the NameExoWorlds contest.[7]

The WASP-64 planetary system[10] Companion
(in order from star) | Mass | Semimajor axis
(AU) | Orbital period
(days) | Eccentricity | Inclination | Radius

|
|
|
|
|
|

b / Agouto | 1.221+0.073
−0.071 MJ | 0.02652+0.00024
−0.00025 | 1.5732918(15) | <0.054  | 86.57+0.80
−0.60° | 1.244±0.036[8] RJ

## References

1. ↑ 1.0 1.1 Gallet, F.; Gallet (2020), "TATOO: Tidal-chronology standalone tool to estimate the age of massive close-in planetary systems", Astronomy & Astrophysics 641: A38, doi:10.1051/0004-6361/202038058, Bibcode: 2020A&A...641A..38G
2. ↑ 2.0 2.1 2.2 Gillon, M.; Anderson, D. R.; Collier-Cameron, A.; Doyle, A. P.; Fumel, A.; Hellier, C.; Jehin, E.; Lendl, M. et al. (2012), "WASP-64b and WASP-72b: two new transiting highly irradiated giant planets", Astronomy & Astrophysics 552: A82, doi:10.1051/0004-6361/201220561, Bibcode: 2013A&A...552A..82G
3. ↑ Evans, D. F.; Southworth, J.; Smalley, B.; Jørgensen, U. G.; Dominik, M.; Andersen, M. I.; Bozza, V.; Bramich, D. M. et al. (2018), "High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP). II. Lucky Imaging results from 2015 and 2016", Astronomy & Astrophysics 610: A20, doi:10.1051/0004-6361/201731855, Bibcode: 2018A&A...610A..20E
4. ↑ 4.0 4.1 Mugrauer, M. (December 2019). "Search for stellar companions of exoplanet host stars by exploring the second ESA-Gaia data release". Monthly Notices of the Royal Astronomical Society 490 (4): 5088–5102. doi:10.1093/mnras/stz2673. Bibcode: 2019MNRAS.490.5088M.
5. ↑ "TYC 7091-1288-1". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=TYC+7091-1288-1.
6. ↑ "WASP-64 Overview". NASA Exoplanet Archive. https://exoplanetarchive.ipac.caltech.edu/overview/WASP-64.
7. ↑ 7.0 7.1 "Togo Approved Names" (in en). International Astronomical Union. http://www.nameexoworlds.iau.org/togo.
8. ↑ 8.0 8.1 Wong, Ian; Shporer, Avi; Daylan, Tansu; Benneke, Björn; Fetherolf, Tara; Kane, Stephen R.; Ricker, George R.; Vanderspek, Roland et al. (2020), "Systematic phase curve study of known transiting systems from year one of the TESS mission", The Astronomical Journal 160 (4): 155, doi:10.3847/1538-3881/ababad, Bibcode: 2020AJ....160..155W
9. ↑ Southworth, John; Dominik, M.; Jørgensen, U. G.; Andersen, M. I.; Bozza, V.; Burgdorf, M. J.; d'Ago, G.; Dib, S. et al. (2019), "Transit timing variations in the WASP-4 planetary system", Monthly Notices of the Royal Astronomical Society 490 (3): 4230–4236, doi:10.1093/mnras/stz2602
10. ↑ Bonomo, A. S. et al. (June 2017). "The GAPS Programme with HARPS-N at TNG. XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy & Astrophysics 602: A107. doi:10.1051/0004-6361/201629882. Bibcode: 2017A&A...602A.107B.

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Coordinates:  02h 44m 09.6098s, −32° 51′ 30.1787″

* v
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* e

Canis Major constellation

Stars
(list)|

| Bayer|

* α (Sirius)
* β (Mirzam)
* γ (Muliphein)
* δ (Wezen)
* ε (Adhara)
* ζ (Furud)
* η (Aludra)
* θ
* ι
* κ
* λ
* μ
* ν1
* ν2
* ν3
* ξ1
* ξ2
* ο1
* ο2
* π
* σ (Unurgunite)
* τ
* ω

|

Flamsteed|

* 10
* 11
* 12
* 15
* 17
* 26
* 27

Variable|

* R
* W
* Z
* SW
* UW (29)
* VY
* CX
* DZ
* EZ
* FN
* FR
* FS
* FV
* FW
* FY
* FZ
* GU
* GY
* GZ
* HN
* HP
* HQ
* HR
* HZ
* IL
* IP
* IY
* KM
* KX
* LS
* LZ
* MZ
* NO
* NR
* OS
* CX
* V350
* V352
* V415

HR|

* 2242
* 2243
* 2244
* 2249
* 2254
* 2260
* 2266
* 2268
* 2271
* 2303
* 2305
* 2307
* 2309
* 2311
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* 2349
* 2359
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* 2379
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* 2397
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* 2764
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* 2786
* 2796
* 2812
* 2822
* 2823
* 2826
* 2831
* 2832
* 2834
* 2839
* 2841
* 2847
* 2859

HD|

* 43197 (Amadioha)
* 44225
* 44379
* 44394
* 45184
* 45364
* 45420
* 46037
* 47012
* 47186
* 47579
* 56578

Other|

* EUVE J0720–317
* PSR B0628–28
* RX J0720.4−3125
* WISE 0713−2917
* WR 7

Star
clusters|

| Open|

* Collinder 121
* Messier 41
* NGC 2204
* NGC 2243
* NGC 2345
* NGC 2354
* NGC 2358
* NGC 2360
* NGC 2362
* NGC 2367
* NGC 2374
* NGC 2383
* NGC 2384

|

Nebulae|

| H II|

* NGC 2359
* NGC 2361
* Sh2-310

|

Reflection|

* NGC 2296
* NGC 2327

Planetary|

* IC 2165
* M 1-11

Galaxies|

| NGC|

* 2206
* 2207
* 2211
* 2212
* 2216
* 2217
* 2223
* 2227
* 2263
* 2267
* 2271
* 2272
* 2280
* 2283
* 2292
* 2293
* 2295
* 2318
* 2325
* 2382

|

Other|

* Canis Major Overdensity
* ESO 428-G14
* IC 2163
* PKS 0634-205
* I Zw 36

Other|

* SN 1999ec
* SN 2003H

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