WASP-94
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Microscopium[1] |
| A | |
| Right ascension | 20h 55m 07.94435s[2] |
| Declination | −34° 08′ 08.0075″[2] |
| Apparent magnitude (V) | 10.1[3] |
| B | |
| Right ascension | 20h 55m 09.15767s[4] |
| Declination | −34° 08′ 07.9138″[4] |
| Apparent magnitude (V) | 10.5[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | F8 + F9[3] |
| Astrometry | |
| A | |
| Radial velocity (Rv) | −8.36±0.19[2] km/s |
| Proper motion (μ) | RA: +26.500 mas/yr[2] Dec.: −44.971 mas/yr[2] |
| Parallax (π) | 4.7498±0.0242 mas[2] |
| Distance | 687 ± 3 ly (211 ± 1 pc) |
| B | |
| Radial velocity (Rv) | −8.30±0.20[4] km/s |
| Proper motion (μ) | RA: +26.191 mas/yr[4] Dec.: −44.702 mas/yr[4] |
| Parallax (π) | 4.7208 ± 0.0165 mas[4] |
| Distance | 691 ± 2 ly (211.8 ± 0.7 pc) |
| Details | |
| A | |
| Mass | 1.45±0.09[3] M☉ |
| Radius | 1.62+0.05 −0.04[3] R☉ |
| Surface gravity (log g) | 4.21±0.011[5] cgs |
| Temperature | 6194±5[5] K |
| Metallicity [Fe/H] | +0.320±0.004[5] dex |
| Rotation | 19.5 d[3] |
| Rotational velocity (v sin i) | 4.2±0.5[3] km/s |
| Age | 2.3–2.8[5] Gyr |
| B | |
| Mass | 1.24±0.09[3] M☉ |
| Radius | 1.35±0.12[3] R☉ |
| Surface gravity (log g) | 4.30±0.015[5] cgs |
| Temperature | 6112±6[5] K |
| Metallicity [Fe/H] | +0.305±0.005[5] dex |
| Rotation | >45.5 d[3] |
| Rotational velocity (v sin i) | <1.5[3] km/s |
| Age | 2.3–2.8[5] Gyr |
| Other designations | |
| CD−34 14724, WASP-94, HJ 5234 | |
| A: TOI-107, TIC 92352620, TYC 7466-1400-1, 2MASS J20550794-3408079[6] | |
| B: TIC 92352621, 2MASS J20550915-3408078[7] | |
| Database references | |
| SIMBAD | A |
| B | |
| Exoplanet Archive | data |
WASP-94 is a binary star system located about 690 light-years (210 parsecs) away in the constellation Microscopium. It consists of two F-type stars separated by 15″, corresponding to a projected separation of 2700 au. Both stars are known to host exoplanets.[3]
The binary system was first observed by John Herschel in 1834 and catalogued as HJ 5234. The designation WASP-94 comes from the Wide Angle Search for Planets, and has been used since the system was found to host planets in 2014.[3] While the two stars have similar spectral types, they differ in elemental abundance – WASP-94A has fewer volatile elements and more refractory elements than WASP-94B.[5]
Planetary system
[edit]The two stars host a single known planet each. Both are hot Jupiters, gas giant planets completing orbits around their stars in just a few days.[3]
WASP-94Ab transits its host star, and it has also been detected by the radial velocity method.[3] As a result, both its size and mass are known, which show that it is a low-density planet with a highly inflated radius. It has an equilibrium temperature of 1508±75 K.[8] Its orbit is retrograde and misaligned with the rotation of its host star.[9] The atmosphere of WASP-94Ab appears to be relatively free of clouds, with sodium,[8] water vapor and carbon dioxide detected.[10]
WASP-94Bb is a non-transiting planet that has been detected only by radial velocity, so it has no measured radius. Its minimum mass is 62% the mass of Jupiter.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.452+0.035 −0.032 MJ |
0.055±0.001 | 3.9501907+0.0000044 −0.0000030 |
<0.064[11] | 88.7±0.7° | 1.72+0.06 −0.05 RJ |
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥0.618+0.028 −0.029 MJ |
0.0335+0.0006 −0.0005 |
2.00839±0.00024 | 0 | — | — |
See also
[edit]Other systems with multiple planet-hosting stars:
References
[edit]- ^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d e f g h i j k l m n o p q r Neveu-VanMalle, M.; Queloz, D.; et al. (December 2014). "WASP-94 A and B planets: hot-Jupiter cousins in a twin-star system". Astronomy & Astrophysics. 572: A49. arXiv:1409.7566. Bibcode:2014A&A...572A..49N. doi:10.1051/0004-6361/201424744.
- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d e f g h i Teske, Johanna K.; Khanal, Sandhya; Ramírez, Ivan (March 2016). "The Curious Case of Elemental Abundance Differences in the Dual Hot Jupiter Hosts WASP-94A and B". The Astrophysical Journal. 819 (1): 19. arXiv:1601.01731. Bibcode:2016ApJ...819...19T. doi:10.3847/0004-637X/819/1/19.
- ^ "CD-34 14724A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 18 May 2025.
- ^ "CD-34 14724B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 18 May 2025.
- ^ a b Ahrer, E.; Wheatley, P. J.; et al. (March 2022). "LRG-BEASTS: Sodium absorption and Rayleigh scattering in the atmosphere of WASP-94A b using NTT/EFOSC2". Monthly Notices of the Royal Astronomical Society. 510 (4): 4857–4871. arXiv:2201.02212. Bibcode:2022MNRAS.510.4857A. doi:10.1093/mnras/stab3805.
- ^ Ahrer, E.; Seidel, J. V.; et al. (May 2024). "Atmospheric characterization and tighter constraints on the orbital misalignment of WASP-94 A b with HARPS". Monthly Notices of the Royal Astronomical Society. 530 (3): 2749–2759. arXiv:2404.06550. Bibcode:2024MNRAS.530.2749A. doi:10.1093/mnras/stae1000.
- ^ Ahrer, Eva-Maria; Gandhi, Siddharth; et al. (May 2025). "Tracing the formation and migration history: molecular signatures in the atmosphere of misaligned hot Jupiter WASP-94Ab using JWST NIRSpec/G395H". Monthly Notices of the Royal Astronomical Society. arXiv:2505.11224. doi:10.1093/mnras/staf819.
- ^ Bonomo, A. S.; Desidera, 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. arXiv:1704.00373. Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882.
