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Star in the constellation Lepus From Wikipedia, the free encyclopedia
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.[6] 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.[5]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Lepus |
Right ascension | 06h 04m 21.47357s[1] |
Declination | −16° 57′ 55.1087″[1] |
Apparent magnitude (V) | 11.35[2] |
Characteristics | |
Spectral type | G6V[3] |
Astrometry | |
Radial velocity (Rv) | 41.81±0.38[1] km/s |
Proper motion (μ) | RA: 54.671 mas/yr[1] Dec.: -19.055 mas/yr[1] |
Parallax (π) | 5.1315 ± 0.0158 mas[1] |
Distance | 636 ± 2 ly (194.9 ± 0.6 pc) |
Details | |
A | |
Mass | 1.003±0.10[3] M☉ |
Radius | 1.038±0.038[3] R☉ |
Luminosity | 0.884[4] L☉ |
Surface gravity (log g) | 4.5±0.1[3] cgs |
Temperature | 5,600±150[5] K |
Metallicity [Fe/H] | −0.230±0.070[5] dex |
Rotational velocity (v sin i) | 0.90±0.30[5] km/s |
Age | 11.9+0.8 −3.2[5] Gyr |
B | |
Mass | 0.337+0.009 −0.024[6] M☉ |
Temperature | 3454+10 −25[6] K |
Other designations | |
Database references | |
SIMBAD | A |
B |
In 2012, one exoplanet, designated WASP-49b, was discovered around the primary star by a team led by Monika Lendl.[8] This is a hot Jupiter with an equilibrium temperature of 1369±39 K.[8]
In 2017, WASP-49b was found to have an extensive sodium envelope.[3] 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 magnesium and iron gas is not gravitationally bound to the planet, but could be magnetically confined to it.[9][10] The sodium envelope around WASP-49b could be due to an Io-like exomoon.[11][12] This idea, however, is speculative.[13]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 0.399+0.029 −0.027 MJ |
0.0379+0.0010 −0.0011 |
2.7817387(56) | <0.026 | 84.89±0.19° | 1.115±0.047 RJ |