WASP-52 is a
K-type main-sequence star
A K-type main-sequence star, also referred to as a K-type dwarf or an 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 star ...
about 570
light-year
A light-year, alternatively spelled light year, is a large unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometers (), or 5.88 trillion miles ().One trillion here is taken to be 1012 ...
s away. It is older than the
Sun
The Sun is the star at the center of the Solar System. It is a nearly perfect ball of hot plasma, heated to incandescence by nuclear fusion reactions in its core. The Sun radiates this energy mainly as light, ultraviolet, and infrared radi ...
at billion years, but it has a similar fraction of
heavy elements
upright=1.2, Crystals of osmium, a heavy metal nearly twice as dense as lead">lead.html" ;"title="osmium, a heavy metal nearly twice as dense as lead">osmium, a heavy metal nearly twice as dense as lead
Heavy metals are generally defined as ...
.
[
The ]star
A star is an astronomical object comprising a luminous spheroid of plasma (physics), plasma held together by its gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked ...
has prominent starspot
Starspots are stellar phenomena, so-named by analogy with sunspots.
Spots as small as sunspots have not been detected on other stars, as they would cause undetectably small fluctuations in brightness. The commonly observed starspots are in gene ...
activity, with 3% to 14% of the stellar surface covered by areas 575 K cooler than the rest of the photosphere.
A multiplicity survey in 2015 did not detect any stellar companions. The star was named Anadolu in 2019 by Turkish astronomers as part of the NameExoWorlds
NameExoWorlds (also known as IAU NameExoWorlds) is the name of various projects managed by the International Astronomical Union (I.A.U.) to encourage names to be submitted for astronomical objects, which would later be considered for official ad ...
contest.['Anadolu' and 'Göktürk': Turkey names its star and planet]
/ref>
Planetary system
In 2012 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 but that have very short orbital periods (). The close proximity to their stars and high surface-atmosphere temp ...
planet, WASP-52b
WASP-52 is a K-type main-sequence star about 570 light-years away. It is older than the Sun at billion years, but it has a similar fraction of heavy elements.
The star has prominent starspot activity, with 3% to 14% of the stellar surface ...
, was detected in a tight, circular orbit.[ The planet has a small measured temperature difference between dayside (1481 K) and nightside (1224 K). Planetary orbit is well aligned with the equatorial plane of the star, the misalignment being 5.47°.][
Search for transit timing variation did not result in detection of additional planets in system as in 2021.
A transmission spectrum taken in 2020 has revealed the presence of ]hydrogen
Hydrogen is the chemical element with the symbol H and atomic number 1. Hydrogen is the lightest element. At standard conditions hydrogen is a gas of diatomic molecules having the formula . It is colorless, odorless, tasteless, non-toxic, an ...
, sodium
Sodium is a chemical element with the symbol Na (from Latin ''natrium'') and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, being in group 1 of the periodic table. Its only stable iso ...
and potassium
Potassium is the chemical element with the symbol K (from Neo-Latin ''kalium'') and atomic number19. Potassium is a silvery-white metal that is soft enough to be cut with a knife with little force. Potassium metal reacts rapidly with atmosphe ...
, although the sodium and potassium lines may be attributable to volcanically active moons of the gas giant, not the planet itself. The atmosphere has no high winds and relatively low-lying clouds, indicating it is not significantly enriched by heavy elements. No signs of the planetary atmosphere escaping to space were detected in 2020, but updated measurement in 2022 showed signs of helium escape, consistent with mass loss rate of 0.5% per billion years.
References
{{DEFAULTSORT:WASP-52
Pegasus (constellation)
K-type main-sequence stars
Planetary systems with one confirmed planet
Planetary transit variables
J23135873+0845405