WASP-80 is a

K-type main-sequence star A K-type main-sequence star, also referred to as a K-type dwarf, or orange dwarf, is a main-sequence (hydrogen-burning) star of spectral type K and luminosity class V. These stars are intermediate in size between red M-type main-sequence stars ...

about 162 light-years away from Earth. The star's age is much younger than the Sun's at 1.352 billion years. WASP-80 could be similar to the Sun in concentration of heavy elements, although this measurement is highly uncertain. The star was named Petra in 2019 by Jordanian amateur astronomers as part of the

NameExoWorlds NameExoWorlds (also known as IAU NameExoWorlds) were various projects managed by the International Astronomical Union (I.A.U.) to encourage names to be submitted for astronomical objects, notably exoplanets. The accepted names would later be cons ...

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

Planetary system

In 2013 a transiting

hot Jupiter Hot Jupiters (sometimes called hot Saturns) are a class of gas giant exoplanets that are inferred to be physically similar to Jupiter (i.e. Jupiter analogue, Jupiter analogues) but that have very short orbital periods (). The close proximity to t ...

planet WASP-80 b was detected on a tight, circular orbit. The planet was named Wadirum by Jordanian astronomers in December 2019. Its equilibrium temperature is , while measured temperature of the dayside is 937 K and temperature of the nightside is 851 K. This temperature difference indicates a rather low planetary albedo and weak global transport of heat. Measurement of the

Rossiter–McLaughlin effect The Rossiter–McLaughlin effect is a spectroscopic phenomenon observed when an object moves across the face of a rotating star. The star is seen to undergo a redshift anomaly caused by the obscuration of different parts of its disk. Descriptio ...

in 2015 revealed WASP-80b's is orbit is well-aligned with the equatorial plane of the star, with orbital obliquity equal to 14°. Although one transmission spectrum of the planetary atmosphere showed signs of ionised

potassium Potassium is a chemical element; it has Symbol (chemistry), symbol K (from Neo-Latin ) and atomic number19. It is a silvery white metal that is soft enough to easily cut with a knife. Potassium metal reacts rapidly with atmospheric oxygen to ...

, another measurement in 2017 yielded a gray and featureless spectrum, probably due to a high cloud deck or haze in the atmosphere of WASP-80b.

References

{{DEFAULTSORT:WASP-80 Aquila (constellation) K-type main-sequence stars Planetary systems with one confirmed planet Planetary transit variables J20124017-0208391

Petra Petra (; "Rock"), originally known to its inhabitants as Raqmu (Nabataean Aramaic, Nabataean: or , *''Raqēmō''), is an ancient city and archaeological site in southern Jordan. Famous for its rock-cut architecture and water conduit systems, P ...

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