20h12m40.1692s, −02° 08′ 39.1912″20h12m 40.1692s[1]
−02° 08′ 39.1912″[1]
11.939
Characteristics
K7[citation needed]
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)
162.2 ± 0.2 ly
(49.72 ± 0.05 pc)
Details
Surface gravity (log g)
Metallicity [Fe/H]
23.5±3[7]
Rotational velocity (v sin i)
5.04±0.19[5] km/s
Database references
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.[7] WASP-80 could be 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 detected a 0.07M☉ companion candidate at an angular separation 2.132±0.010 arcseconds, with a false alarm probability of 3%.[9]
In 2013 a transiting hot Jupiter planet WASP-80 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 the dayside is 937±48K and temperature of the nightside is 851±14K. This temperature difference indicates a 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] The James Webb Space Telescope has characterized the atmospheric composition of WASP-80 b, detecting signs of water vapor and methane on the planet.[15] This discovery not only uncovers the exoplanet's origin and evolution but also fosters a comparative study bridging our solar system's gas giants and diverse exoplanets.[16]
The WASP-80 planetary system
Companion
(in order from star)
0.0344+0.0011
−0.0010[4]
3.067852[4]
0[4]
Other
Other
NGC
Other
