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Discovery | |
---|---|
Discovery date | 2012 |
Orbital characteristics | |
0.0379+0.0010 −0.0011 AU | |
Eccentricity | <0.026 |
2.781 d | |
Inclination | 84.89±0.19 |
Physical characteristics | |
1.115±0.047 | |
Mass | 0.399+0.029 −0.027 |
Temperature | 1369±39 K |
WASP-49b is a hot-Jupiter exoplanet orbiting the Sun-like star WASP-49 A. It is about 40% the mass of Jupiter and has an equilibrium temperature of 1369±39 K.[1] The planet was discovered to be surrounded by a sodium envelope, which could indicate the presence of a potential exomoon.[2]
WASP-49b was found to possess an extensive sodium envelope in 2017.[2] Additionally, the Hubble Space Telescope found clear absorption features in near-UV light, indicating the presence of magnesium and iron. These metals may not be gravitationally bound to the planet, but could be magnetically confined to it.[3] WASP-49b has an equilibrium temperature of 1369±39 K, making it a hot-Jupiter or hot-Saturn planet.
The existence of a sodium envelope around WASP-49b could be explained by the presence of a volcanically active, Io-like exomoon.[4] However, this idea remains speculative. Additionally, 3 sodium "booms" were detected over a period of 40 minutes each, as well as Doppler-shifts of the planet indicative of a third body orbiting WASP-49b with a period of 8 hours, near the planet's Roche limit.[5]