WASP-69
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 21h 00m 06.1969s[1] |
| Declination | −05° 05′ 40.0370″[1] |
| Apparent magnitude (V) | 9.87±0.03[2] |
| Characteristics | |
| Evolutionary stage | main-sequence star |
| Spectral type | K5V[3] |
| Astrometry | |
| Radial velocity (Rv) | -9.372[4] km/s |
| Proper motion (μ) | RA: 33.778[4] mas/yr Dec.: -93.581[4] mas/yr |
| Parallax (π) | 19.8858 ± 0.0170 mas[4] |
| Distance | 164.0 ± 0.1 ly (50.29 ± 0.04 pc) |
| Details[5] | |
| Mass | 0.826±0.029[2] M☉ |
| Radius | 0.813[2] R☉ |
| Surface gravity (log g) | 4.59±0.02 cgs |
| Temperature | 4782±15 K |
| Metallicity [Fe/H] | 0.10±0.01 dex |
| Rotation | 23.07 d[2] |
| Rotational velocity (v sin i) | 1.27±0.22 km/s |
| Age | 2[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | 5432 data |
WASP-69 is a K-type main-sequence star. Its surface temperature is 4782±15 K. WASP-41 is slightly enriched in heavy elements compared to the Sun , with a metallicity Fe/H index of 0.10±0.01,[5] and is much younger than Sun at 2 billion years. The data regarding starspot activity of WASP-69 are inconclusive, but spot coverage may be very high.[6]
Multiplicity surveys did not detect any stellar companions to WASP-69 as of 2020.[7]
Planetary system
In 2013, one planet, named WASP-69b, was discovered on a tight, circular orbit.[2] Its equilibrium temperature is 886 K,[8] but measured terminator temperature is lower at 750 [[Kelvin|K].[6] at The planet is losing mass at moderate rate 0.5 ME per billion years.[8]
The planetary atmosphere is extremely hazy and contains a partial cloud deck with cloud tops rising to pressure of 100 Pa. Its composition is mostly hydrogen and helium, and sodium was also detected in low concentration.[6][9] The sodium may originate from volcanic moons, not from the planet itself.[10]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.260±0.017 MJ | 0.04525±0.00053 | 3.8681382±0.0000017 | 0 | 86.71±0.20° | 0.945+0.007 −0.017[6] RJ |
References
- ^ a b c "BD-05 5432". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-08.
- ^ a b c d e f g Three sub-Jupiter-mass planets: WASP-69b & WASP-84b transit active K dwarfs and WASP-70Ab transits the evolved primary of a G4+K3 binary, 2013, arXiv:1310.5654
- ^ FAR-ULTRAVIOLET ACTIVITY LEVELS OF F, G, K, AND M DWARF EXOPLANET HOST STARS, 2018, arXiv:1809.07342
- ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b The atmospheric parameters of FGK stars using wavelet analysis of CORALIE spectra, 2018, arXiv:1801.06106
- ^ a b c d The GTC exoplanet transit spectroscopy survey XI. Possible detection of Rayleigh scattering in the atmosphere of the Saturn-mass planet WASP-69b, 2020, arXiv:2007.02741
- ^ A multiplicity study of transiting exoplanet host stars. I. High-contrast imaging with VLT/SPHERE, 2020, arXiv:2001.08224
- ^ a b Metastable Helium Absorptions with 3D Hydrodynamics and Self-Consistent Photochemistry I:WASP-69b, dimensionality, XUV Flux Level, Spectral Types, and Flares, 2020, arXiv:2101.00042
- ^ Detection of sodium in the atmosphere of WASP-69b, 2017, arXiv:1710.06479
- ^ Sodium and Potassium Signatures of Volcanic Satellites Orbiting Close-in Gas Giant Exoplanets, 2019, arXiv:1908.10732
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