- Source: WASP-49
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WASP-49 is a binary star system about 636 light-years (195 parsecs) away in the constellation Lepus. The two stars are separated by 443 AU. The primary is a G-type main-sequence star, with a surface temperature of 5,600 K (5,330 °C; 9,620 °F). WASP-49 is depleted of heavy elements relative to the Sun. It has a metallicity Fe/H index of –0.23, meaning it has 59% the iron level of the Sun.
Planetary system
In 2012, one exoplanet, designated WASP-49b, was discovered around the primary star by a team led by Monika Lendl. This is a hot Jupiter with an equilibrium temperature of 1369±39 K.
In 2017, WASP-49b was found to have an extensive sodium envelope. A study in 2019 using data from the Hubble Space Telescope in near-UV found clear absorption features caused by metals, including magnesium and iron. The gaseous magnesium and iron is not gravitationally bound to the planet, but could be magnetically confined to it. The sodium layer around WASP-49b could be due to a tidally-heated Io-like exomoon. In October 2024, a 5-year study was published indicating that the sodium envelope most likely comes from a distinct body orbiting WASP-49b rather than the star or the planet, although the exact dynamics of the envelope remains to be settled.