WASP-80
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]
| 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 |
| 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 mas[2] |
| Distance | 162.2 ± 0.2 ly (49.72 ± 0.05 pc) |
| Details | |
| Mass | 0.614+0.014 −0.012[3] M☉ |
| Radius | 0.586+0.017 −0.018[4] R☉ |
| Surface gravity (log g) | 4.60±0.02[5] cgs |
| Temperature | 4066±22[5] K |
| Metallicity [Fe/H] | 0.13±0.11[6] dex |
| Rotation | 23.5±3[7] |
| Rotational velocity (v sin i) | 5.04±0.19[5] km/s |
| Age | 1.352±0.222[7] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
| 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
- "WASP-80". SIMBAD. Centre de données astronomiques de Strasbourg.
- 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.
- 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", The Astrophysical Journal Supplement Series, 255: 15, arXiv:2105.14851, Bibcode:2021ApJS..255...15W, doi:10.3847/1538-4365/ac0835, S2CID 235253975
- 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
- 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
- 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
- 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
- "Star, its exoplanet named after Petra, Wadi Rum". Roya News. 2019-12-17. Retrieved 2021-04-04.
- 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, Bibcode:2020A&A...635A..73B, doi:10.1051/0004-6361/201937127, S2CID 210861118
- 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
- Wong, Ian; Chachan, Yayaati; Knutson, Heather A.; Henry, Gregory W.; Adams, Danica; Kataria, Tiffany; Benneke, Björn; Gao, Peter; Deming, Drake; López-Morales, Mercedes; Sing, David K.; Alam, Munazza K.; Ballester, Gilda E.; Barstow, Joanna K.; Buchhave, Lars A.; Dos Santos, Leonardo A.; Fu, Guangwei; Muñoz, Antonio García; MacDonald, Ryan J.; Mikal-Evans, Thomas; Sanz-Forcada, Jorge; Wakeford, Hannah R. (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: 30, arXiv:2205.10765, doi:10.3847/1538-3881/ac7234, S2CID 248987053
- 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
- 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
- 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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