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KELT-1
Star in the constellation Andromeda From Wikipedia, the free encyclopedia
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KELT-1 is a F-type main-sequence star. Its surface temperature is 6518±50 K. It is similar to the Sun in its concentration of heavy elements, with a metallicity Fe/H index of 0.008±0.073, but is much younger at an age of 1.75±0.25 billion years. The star is rotating very rapidly.[3]
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A red dwarf stellar companion at a projected separation of 154±8 AU was detected in 2012, simultaneously with a planetary companion.[3]
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Planetary system
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The star was found to be orbited by a low-mass brown dwarf or giant planet in 2012.[3]
The atmosphere of the brown dwarf KELT-1b has been extensively measured from space- and ground-based observatories by a team of astronomers led by Thomas Beatty. They found that KELT-1b has an equilibrium temperature of 2422+32
−26 K,[3] but features a very strong contrast between measured dayside and nightside temperatures. Dayside temperature appears to be 3340±110 K,[6] while nightside temperature is 1173+175
−130 K.[7] The excess dayside temperature may be an artifact arising from highly reflective (dayside albedo reaching 0.5, which is unusual for hot planets and brown dwarfs) rock-vapor clouds. Also, the brightest band is shifted eastward from the subsolar point by 18.3±7.4°.[6]
KELT-1b's density of 22.1+5.62
−9.16 g/cm3 is the highest among well characterized planets.[5]
The planetary orbit is well aligned with the equatorial plane of the star, with the misalignment angle equal to 2±16°.[3] Despite the short orbital period, orbital decay of KELT-1b has not been detected as of 2018.[8]
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