WASP-80

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

WASP-80
Observation data
Epoch J2000      Equinox J2000
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
Spectral type K7[citation needed]
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 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,[6] slightly below the measured dayside temperature of 888+58
−57 K.[4]

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,[11] another measurement in 2017 yielded a gray and featureless spectrum, probably due to a high cloud deck[12] or haze[13] in the atmosphere of .

The WASP-80 planetary system
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
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. ^ Jump up to: a b c "WASP-80". SIMBAD. Centre de données astronomiques de Strasbourg.
  2. ^ Jump up to: 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. Gaia EDR3 record for this source at VizieR.
  3. ^ Jump up to: a b c Wang, Xian-Yu; Wang, Yong-Hao; Wang, Songhu; Wu, Zhen-Yu; Rice, Malena; Zhou, Xu; Hinse, Tobias C.; Liu, Hui-Gen; Ma, Bo; Peng, Xiyan; Zhang, Hui; Yu, Cong; Zhou, Ji-Lin; Laughlin, Gregory (2021), Transiting Exoplanet Monitoring Project (TEMP). VI. The Homogeneous Refinement of System Parameters for 39 Transiting Hot Jupiters with 127 New Light Curves, arXiv:2105.14851
  4. ^ Jump up to: a b c d e f g Triaud, A. H. M. J.; Gillon, M.; Ehrenreich, D.; Herrero, E.; Lendl, M.; Anderson, D. R.; Collier Cameron, A.; Delrez, L.; Demory, B.-O.; Hellier, C.; Heng, K.; Jehin, E.; Maxted, P. F. L.; Pollacco, D.; Queloz, D.; Ribas, I.; Smalley, B.; Smith, A. M. S.; Udry, S. (2015), "WASP-80b has a dayside within the T-dwarf range", Monthly Notices of the Royal Astronomical Society, 450 (3): 2279–2290, arXiv:1503.08152, doi:10.1093/mnras/stv706
  5. ^ Jump up to: a b c 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, arXiv:1801.06106, Bibcode:2018A&A...612A.111G, doi:10.1051/0004-6361/201731954, S2CID 119331772
  6. ^ Jump up to: a b c Wallack, Nicole L.; Knutson, Heather A.; Morley, Caroline V.; Moses, Julianne I.; Thomas, Nancy H.; Thorngren, Daniel P.; Deming, Drake; Désert, Jean-Michel; Fortney, Jonathan J.; Kammer, Joshua A. (2019), "Investigating Trends in Atmospheric Compositions of Cool Gas Giant Planets UsingSpitzer Secondary Eclipses", The Astronomical Journal, 158 (6): 217, arXiv:1908.00014, Bibcode:2019AJ....158..217W, doi:10.3847/1538-3881/ab2a05, S2CID 199064423
  7. ^ Jump up to: a b c Gallet, F.; Gallet (2020), "TATOO: Tidal-chronology standalone tool to estimate the age of massive close-in planetary systems", Astronomy & Astrophysics, 641: A38, arXiv:2006.07880, Bibcode:2020A&A...641A..38G, doi:10.1051/0004-6361/202038058, S2CID 219687851
  8. ^ Jump up to: a b "Star, its exoplanet named after Petra, Wadi Rum". Roya News. 2019-12-17. Retrieved 2021-04-04.
  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, arXiv:2001.08224, doi:10.1051/0004-6361/201937127, S2CID 210861118
  10. ^ Triaud, A. H. M. J.; Anderson, D. R.; Collier Cameron, A.; Doyle, A. P.; Fumel, A.; Gillon, M.; Hellier, C.; Jehin, E.; Lendl, M.; Lovis, C.; Maxted, P. F. L.; Pepe, F.; Pollacco, D.; Queloz, D.; Ségransan, D.; Smalley, B.; Smith, A. M. S.; Udry, S.; West, R. G.; Wheatley, P. J. (2013), "WASP-80b: A gas giant transiting a cool dwarf", Astronomy & Astrophysics, 551: A80, arXiv:1303.0254, Bibcode:2013A&A...551A..80T, doi:10.1051/0004-6361/201220900, S2CID 67805044
  11. ^ 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, arXiv:1703.02630, doi:10.1093/mnras/stx646
  12. ^ Parviainen, H.; Pallé, E.; Chen, G.; Nortmann, L.; Murgas, F.; Nowak, G.; Aigrain, S.; Booth, A.; Abazorius, M.; Iro, N. (2018), "The GTC exoplanet transit spectroscopy survey", Astronomy & Astrophysics, 609: A33, arXiv:1709.01875, doi:10.1051/0004-6361/201731113, S2CID 118890485
  13. ^ 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, arXiv:1710.10083, doi:10.1093/mnras/stx2826
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