Astronomy:WASP-80

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Short description: Star in the constellation Aquila

Coordinates: Sky map 20h 12m 40.1692s, −02° 08′ 39.1912″

WASP-80 / Petra
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aquila
Right ascension  20h 12m 40.1692s[1]
Declination −02° 08′ 39.1912″[1]
Apparent magnitude (V) 11.939
Characteristics
Evolutionary stage Main sequence
Astrometry
Radial velocity (Rv)9.82±0.77[2] km/s
Proper motion (μ) RA: -132.913[2] mas/yr
Dec.: -50.683[2] mas/yr
Parallax (π)20.1141 ± 0.0207[2] mas
Distance162.2 ± 0.2 ly
(49.72 ± 0.05 pc)
Details
Mass0.614+0.014−0.012[3] M☉
Radius0.586+0.017−0.018[4] R☉
Surface gravity (log g)4.60±0.02[5] cgs
Temperature4066±22[5] K
Metallicity [Fe/H]0.13±0.11[6] dex
Rotation23.5±3[7]
Rotational velocity (v sin i)5.04±0.19[5] km/s
Age1.352±0.222[7] Gyr
Other designations
Petra, Gaia DR2 4223507222112425344, TYC 5165-481-1, GSC 05165-00481, 2MASS J20124017-0208391[1]
Database references
SIMBADdata

WASP-80 is a K-type main-sequence star about 162 light-years away. The star's age is much younger than the Sun's at 1.352±0.222 billion years.[7] WASP-80 is similar to the Sun in concentration of heavy elements, although this measurement is highly uncertain.[6]

The star was named Petra in 2019 by Jordanian amateur astronomers as part of the NameExoWorlds contest.[8]

Three multiplicity surveys in 2015-2018 did not detect any stellar companions to WASP-80, but a survey in 2020 did detect a 0.07M☉ companion candidate at an angular separation 2.132±0.010 arcseconds, with a false alarm probability of 3%.[9]

Planetary system

In 2013 a transiting hot Jupiter planet b was detected on a tight, circular orbit.[10] The planet was named Wadirum by Jordanian astronomers in December 2019.[8] Its equilibrium temperature is 825±19 K, while measured temperature of dayside is 937±48 K and temperature of nightside - 851±14 K. That temperature difference indicate rather low planetary albedo and weak global transport of heat.[11]

Measurement of the Rossiter–McLaughlin effect in 2015 revealed WASP-80b's is orbit is well aligned with the equatorial plane of the star, with orbital obliquity equal to 14±14°.[4]

Although one transmission spectrum of the planetary atmosphere showed signs of ionised potassium,[12] another measurement in 2017 yielded a gray and featureless spectrum, probably due to a high cloud deck[13] or haze[14] in the atmosphere of WASP-80b. [11] WASP-80b has an atmosphere that contains methane and water vapor.[15]

The WASP-80 planetary system
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b (Wadirum) 0.571±0.02[3] MJ 0.0344+0.0011−0.0010[4] 3.067852[4] 0[4] 89.02+0.11−0.10[4]° 1.0091+0.011−0.0095[3] RJ

References

  1. ↑ 1.0 1.1 1.2 "WASP-80". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=WASP-80. 
  2. ↑ 2.0 2.1 2.2 2.3 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 Wang, Xian-Yu; Wang, Yong-Hao; Wang, Songhu; Wu, Zhen-Yu; Rice, Malena; Zhou, Xu; Hinse, Tobias C.; Liu, Hui-Gen et al. (2021), "Transiting Exoplanet Monitoring Project (TEMP). VI. The Homogeneous Refinement of System Parameters for 39 Transiting Hot Jupiters with 127 New Light Curves", The Astrophysical Journal Supplement Series 255 (1): 15, doi:10.3847/1538-4365/ac0835, Bibcode: 2021ApJS..255...15W 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Triaud, A. H. M. J.; Gillon, M.; Ehrenreich, D.; Herrero, E.; Lendl, M.; Anderson, D. R.; Collier Cameron, A.; Delrez, L. et al. (2015), "WASP-80b has a dayside within the T-dwarf range", Monthly Notices of the Royal Astronomical Society 450 (3): 2279–2290, doi:10.1093/mnras/stv706 
  5. ↑ 5.0 5.1 5.2 Gill, S.; Maxted, P. F. L.; Smalley, B. (2018), "The atmospheric parameters of FGK stars using wavelet analysis of CORALIE spectra", Astronomy & Astrophysics 612: A111, doi:10.1051/0004-6361/201731954, Bibcode: 2018A&A...612A.111G 
  6. ↑ 6.0 6.1 Wallack, Nicole L.; Knutson, Heather A.; Morley, Caroline V.; Moses, Julianne I.; Thomas, Nancy H.; Thorngren, Daniel P.; Deming, Drake; Désert, Jean-Michel et al. (2019), "Investigating Trends in Atmospheric Compositions of Cool Gas Giant Planets UsingSpitzer Secondary Eclipses", The Astronomical Journal 158 (6): 217, doi:10.3847/1538-3881/ab2a05, Bibcode: 2019AJ....158..217W 
  7. ↑ 7.0 7.1 7.2 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 
  8. ↑ 8.0 8.1 "Star, its exoplanet named after Petra, Wadi Rum". 2019-12-17. https://en.royanews.tv/news/19494/Star--its-exoplanet-named-after-Petra--Wadi-Rum. 
  9. ↑ Bohn, A. J.; Southworth, J.; Ginski, C.; Kenworthy, M. A.; Maxted, P. F. L.; Evans, D. F. (2020), "A multiplicity study of transiting exoplanet host stars", Astronomy & Astrophysics 635: A73, doi:10.1051/0004-6361/201937127, Bibcode: 2020A&A...635A..73B 
  10. ↑ Triaud, A. H. M. J.; Anderson, D. R.; Collier Cameron, A.; Doyle, A. P.; Fumel, A.; Gillon, M.; Hellier, C.; Jehin, E. et al. (2013), "WASP-80b: A gas giant transiting a cool dwarf", Astronomy & Astrophysics 551: A80, doi:10.1051/0004-6361/201220900, Bibcode: 2013A&A...551A..80T 
  11. ↑ 11.0 11.1 Wong, Ian; Chachan, Yayaati; Knutson, Heather A.; Henry, Gregory W.; Adams, Danica; Kataria, Tiffany; Benneke, Björn; Gao, Peter et al. (2022), "The Hubble PanCET Program: A Featureless Transmission Spectrum for WASP-29b and Evidence of Enhanced Atmospheric Metallicity on WASP-80b", The Astronomical Journal 164 (1): 30, doi:10.3847/1538-3881/ac7234, Bibcode: 2022AJ....164...30W 
  12. ↑ Sedaghati, Elyar; Boffin, Henri M. J.; Delrez, Laetitia; Gillon, Michaël; Csizmadia, Szilard; Smith, Alexis M. S.; Rauer, Heike (2017), "Probing the atmosphere of a sub-Jovian planet orbiting a cool dwarf", Monthly Notices of the Royal Astronomical Society 468 (3): 3123–3134, doi:10.1093/mnras/stx646 
  13. ↑ Parviainen, H.; Pallé, E.; Chen, G.; Nortmann, L.; Murgas, F.; Nowak, G.; Aigrain, S.; Booth, A. et al. (2018), "The GTC exoplanet transit spectroscopy survey", Astronomy & Astrophysics 609: A33, doi:10.1051/0004-6361/201731113 
  14. ↑ Kirk, J.; Wheatley, P. J.; Louden, T.; Skillen, I.; King, G. W.; McCormac, J.; Irwin, P. G. J. (2018), "LRG-BEASTS III: Ground-based transmission spectrum of the gas giant orbiting the cool dwarf WASP-80", Monthly Notices of the Royal Astronomical Society 474: 876–885, doi:10.1093/mnras/stx2826 
  15. ↑ "NASA's Webb Identifies Methane In an Exoplanet's Atmosphere – James Webb Space Telescope" (in en-US). 2023-11-22. https://blogs.nasa.gov/webb/2023/11/22/nasas-webb-identifies-methane-in-an-exoplanets-atmosphere/. 



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