WASP-80
{{Short description|Star in the constellation Aquila}}
{{Sky|20|12|40.1692|-|02|08|39.1912}}
{{Starbox begin
| name = WASP-80 / Petra
}}
{{Starbox observe
| epoch = J2000
| dec = {{DEC|-02|08|39.1912}}
| constell = Aquila
| appmag_v = 11.939
}}
{{Starbox character
| type=Main sequence
| class = K7{{citation needed|date=April 2021}}
}}
{{Starbox astrometry
| parallax = 20.1141
| p_error = 0.0207
| parallax_footnote = {{cite Gaia EDR3|4223507222112425344}}
}}
{{Starbox detail
| source =
| radius = 0.586{{±|0.017|0.018}}
| luminosity =
| rotational_velocity =5.04{{±|0.19}}
}}
{{Starbox catalog
| names = Petra, {{odlist|TYC=5165-481-1|2MASS=J20124017-0208391|Gaia DR2=4223507222112425344|GSC=05165-00481}}
}}
{{Starbox reference
| Simbad = WASP+80
}}
{{Starbox end}}
WASP-80 is a K-type main-sequence star about 162 light-years away from Earth. The star's age is much younger than the Sun's at 1.352{{±|0.222}} billion years. WASP-80 could be similar to the Sun in concentration of heavy elements, although this measurement is highly uncertain.{{citation |arxiv=1908.00014 |doi=10.3847/1538-3881/ab2a05 |title=Investigating Trends in Atmospheric Compositions of Cool Gas Giant Planets UsingSpitzer Secondary Eclipses |year=2019 |last1=Wallack |first1=Nicole L. |last2=Knutson |first2=Heather A. |last3=Morley |first3=Caroline V. |last4=Moses |first4=Julianne I. |last5=Thomas |first5=Nancy H. |last6=Thorngren |first6=Daniel P. |last7=Deming |first7=Drake |last8=Désert |first8=Jean-Michel |last9=Fortney |first9=Jonathan J. |last10=Kammer |first10=Joshua A. |journal=The Astronomical Journal |volume=158 |issue=6 |page=217 |bibcode=2019AJ....158..217W |s2cid=199064423 |doi-access=free }}
The star was named Petra in 2019 by Jordanian amateur astronomers as part of the NameExoWorlds contest.{{cite web |url=https://en.royanews.tv/news/19494/Star--its-exoplanet-named-after-Petra--Wadi-Rum |title=Star, its exoplanet named after Petra, Wadi Rum |website=Roya News |date=2019-12-17 |access-date=2021-04-04 }}
Three multiplicity surveys in 2015-2018 did not detect any stellar companions to WASP-80, but a survey in 2020 detected a 0.07{{Solar_mass}} companion candidate at an angular separation 2.132{{±|0.010}} arcseconds, with a false alarm probability of 3%.{{citation |arxiv=2001.08224 |doi=10.1051/0004-6361/201937127 |title=A multiplicity study of transiting exoplanet host stars |year=2020 |last1=Bohn |first1=A. J. |last2=Southworth |first2=J. |last3=Ginski |first3=C. |last4=Kenworthy |first4=M. A. |last5=Maxted |first5=P. F. L. |last6=Evans |first6=D. F. |journal=Astronomy & Astrophysics |volume=635 |pages=A73 |bibcode=2020A&A...635A..73B |s2cid=210861118 }}
Planetary system
In 2013 a transiting hot Jupiter planet WASP-80 b was detected on a tight, circular orbit.{{citation |arxiv=1303.0254 |doi=10.1051/0004-6361/201220900 |title=WASP-80b: A gas giant transiting a cool dwarf |year=2013 |last1=Triaud |first1=A. H. M. J. |last2=Anderson |first2=D. R. |last3=Collier Cameron |first3=A. |last4=Doyle |first4=A. P. |last5=Fumel |first5=A. |last6=Gillon |first6=M. |last7=Hellier |first7=C. |last8=Jehin |first8=E. |last9=Lendl |first9=M. |last10=Lovis |first10=C. |last11=Maxted |first11=P. F. L. |last12=Pepe |first12=F. |last13=Pollacco |first13=D. |last14=Queloz |first14=D. |last15=Ségransan |first15=D. |last16=Smalley |first16=B. |last17=Smith |first17=A. M. S. |last18=Udry |first18=S. |last19=West |first19=R. G. |last20=Wheatley |first20=P. J. |journal=Astronomy & Astrophysics |volume=551 |pages=A80 |bibcode=2013A&A...551A..80T |s2cid=67805044 }} The planet was named Wadirum by Jordanian astronomers in December 2019. Its equilibrium temperature is {{val|825|19|ul=K}}, while measured temperature of the dayside is 937{{±|48}} K and temperature of the nightside is 851{{±|14}} K. This temperature difference indicates a rather low planetary albedo and weak global transport of heat.
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}}°.
Although one transmission spectrum of the planetary atmosphere showed signs of ionised potassium,{{citation |arxiv=1703.02630 |doi=10.1093/mnras/stx646 |title=Probing the atmosphere of a sub-Jovian planet orbiting a cool dwarf |year=2017 |last1=Sedaghati |first1=Elyar |last2=Boffin |first2=Henri M. J. |last3=Delrez |first3=Laetitia |last4=Gillon |first4=Michaël |last5=Csizmadia |first5=Szilard |last6=Smith |first6=Alexis M. S. |last7=Rauer |first7=Heike |journal=Monthly Notices of the Royal Astronomical Society |volume=468 |issue=3 |pages=3123–3134 |doi-access=free }} another measurement in 2017 yielded a gray and featureless spectrum, probably due to a high cloud deck{{citation |arxiv=1709.01875 |doi=10.1051/0004-6361/201731113 |title=The GTC exoplanet transit spectroscopy survey |year=2018 |last1=Parviainen |first1=H. |last2=Pallé |first2=E. |last3=Chen |first3=G. |last4=Nortmann |first4=L. |last5=Murgas |first5=F. |last6=Nowak |first6=G. |last7=Aigrain |first7=S. |last8=Booth |first8=A. |last9=Abazorius |first9=M. |last10=Iro |first10=N. |journal=Astronomy & Astrophysics |volume=609 |pages=A33 |s2cid=118890485 }} or haze{{citation |arxiv=1710.10083 |doi=10.1093/mnras/stx2826 |title=LRG-BEASTS III: Ground-based transmission spectrum of the gas giant orbiting the cool dwarf WASP-80 |year=2018 |last1=Kirk |first1=J. |last2=Wheatley |first2=P. J. |last3=Louden |first3=T. |last4=Skillen |first4=I. |last5=King |first5=G. W. |last6=McCormac |first6=J. |last7=Irwin |first7=P. G. J. |journal=Monthly Notices of the Royal Astronomical Society |volume=474 |pages=876–885 |doi-access=free }} in the atmosphere of WASP-80b. {{citation|arxiv=2205.10765|year=2022|title=The Hubble PanCET Program: A Featureless Transmission Spectrum for WASP-29b and Evidence of Enhanced Atmospheric Metallicity on WASP-80b|doi=10.3847/1538-3881/ac7234 |last1=Wong |first1=Ian |last2=Chachan |first2=Yayaati |last3=Knutson |first3=Heather A. |last4=Henry |first4=Gregory W. |last5=Adams |first5=Danica |last6=Kataria |first6=Tiffany |last7=Benneke |first7=Björn |last8=Gao |first8=Peter |last9=Deming |first9=Drake |last10=López-Morales |first10=Mercedes |last11=Sing |first11=David K. |last12=Alam |first12=Munazza K. |last13=Ballester |first13=Gilda E. |last14=Barstow |first14=Joanna K. |last15=Buchhave |first15=Lars A. |last16=Dos Santos |first16=Leonardo A. |last17=Fu |first17=Guangwei |last18=Muñoz |first18=Antonio García |last19=MacDonald |first19=Ryan J. |last20=Mikal-Evans |first20=Thomas |last21=Sanz-Forcada |first21=Jorge |last22=Wakeford |first22=Hannah R. |journal=The Astronomical Journal |volume=164 |issue=1 |page=30 |bibcode=2022AJ....164...30W |s2cid=248987053 |doi-access=free }}
{{OrbitboxPlanet begin
| name = WASP-80
| table_ref =
}}
{{OrbitboxPlanet
| exoplanet = b (Wadirum)
| radius = 1.0091{{±|0.011|0.0095}}
| semimajor = 0.0344{{±|0.0011|0.0010}}
| inclination = 89.02{{±|0.11|0.10}}
}}
{{Orbitbox end}}
References
{{Reflist|refs=
{{cite simbad |title=WASP-80}}
}}
{{Aquila (constellation)}}
{{DEFAULTSORT:WASP-80}}
Category:Aquila (constellation)
Category:K-type main-sequence stars
Category:Planetary systems with one confirmed planet