WASP-46

Star in the constellation Indus From Wikipedia, the free encyclopedia

WASP-46 is a G-type main-sequence star about 1,210 light-years (370 parsecs) away. The star is older than the Sun and is strongly depleted in heavy elements compared to the Sun, having just 45% of the solar abundance.[2] Despite its advanced age, the star is rotating rapidly, being spun up by the tides raised by a giant planet on a close orbit.[6]

Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
WASP-46
Observation data
Epoch J2000      Equinox J2000
Constellation Indus
Right ascension 21h 14m 56.85987s[1]
Declination −55° 52 18.4581[1]
Apparent magnitude (V) 12.9[2]
Characteristics
Spectral type G6V[2]
Astrometry
Radial velocity (Rv)−3.28±1.62[1] km/s
Proper motion (μ) RA: 12.521 mas/yr[1]
Dec.: -16.150 mas/yr[1]
Parallax (π)2.6878±0.0131 mas[1]
Distance1,213 ± 6 ly
(372 ± 2 pc)
Details[3]
Mass0.828±0.067 M
Radius0.858±0.024 R
Surface gravity (log g)4.489±0.013[4] cgs
Temperature5600±150 K
Metallicity [Fe/H]−0.37±0.13 dex
Rotation16.0±1.0 d
Rotational velocity (v sin i)1.9±1.2 km/s
Age9.6+3.4
−4.2
 Gyr
Other designations
TOI-101, TIC 231663901, WASP-46, GSC 08797-00758, 2MASS J21145687-5552184, DENIS J211456.8-555218[5]
Database references
SIMBADdata
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The star displays an excess ultraviolet emission associated with starspot activity,[7] and is suspected to be surrounded by a dust and debris disk.[8]

Planetary system

In 2011 a transiting hot superjovian planet, WASP-46b, was detected.[2] The planet's equilibrium temperature is 1636±44 K.[4] The dayside temperature measured in 2014 is much higher at 2386 K, indicating a very poor heat redistribution across the planet.[9] A re-measurement of the dayside planetary temperature in 2020 resulted in a lower value of 1870+130
120
K.[10]

In 2017, a search for transit-timing variations of WASP-46b yielded zero results, thus ruling out existence of additional gas giants in the system. The orbital decay of WASP-46b was also not detected.[11]

More information Companion (in order from star), Mass ...
The WASP-46 planetary system[4]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 1.91±0.11 MJ 0.02335±0.00063 1.43036763(93) <0.022[3] 82.80±0.17° 1.174±0.033 RJ
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References

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