KIC 8462852 | Wikipedia audio article
Channel: wikipedia tts
Date: 27/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/KIC_8462852


00:03:29 1 Nomenclature
00:04:19 2 Location
00:05:21 3 History of observations
00:06:22 4 Luminosity
00:09:55 5 Hypotheses
00:11:09 5.1 Circumstellar dust ring
00:14:04 5.2 A cloud of disintegrating comets
00:15:39 5.3 Younger star with coalescing material around it
00:16:26 5.4 Planetary debris field
00:18:05 5.5 Consumption of a planet
00:19:03 5.6 Large planet with oscillating rings
00:19:31 5.7 Large ringed planet followed by Trojan swarms
00:21:10 5.8 Intrinsic luminosity variations
00:23:18 5.9 An artificial megastructure
00:25:01 6 Follow-up studies
00:27:29 6.1 SETI results
00:29:23 6.2 EPIC 204278916
00:30:43 7 2017 light fluctuations
00:35:39 8 2018 light fluctuations
00:36:44 9 2019 light fluctuations
00:37:31 10 Light curve gallery
00:37:41 11 See also



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SUMMARY
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KIC 8462852 (also Tabby's Star or Boyajian's Star) is an F-type main-sequence star located in the constellation Cygnus approximately 1,470 light-years (450 pc) from Earth. Unusual light fluctuations of the star, including up to a 22% dimming in brightness, were discovered by citizen scientists as part of the Planet Hunters project. In September 2015, astronomers and citizen scientists associated with the project posted a preprint of an article describing the data and possible interpretations. The discovery was made from data collected by the Kepler space telescope, which observed changes in the brightness of distant stars to detect exoplanets.Several hypotheses have been proposed to explain the star's large irregular changes in brightness as measured by its light curve, but none to date fully explain all aspects of the curve. One explanation is that an "uneven ring of dust" orbits KIC 8462852. In another explanation, the star's luminosity is modulated by changes in the efficiency of heat transport to its photosphere, so no external obscuration is required. A third hypothesis, based on a lack of observed infrared light, posits a swarm of cold, dusty comet fragments in a highly eccentric orbit, however, the notion that disturbed comets from such a cloud could exist in high enough numbers to obscure 22% of the star's observed luminosity has been doubted. Another hypothesis is that a large number of small masses in "tight formation" are orbiting the star. Furthermore, spectroscopic study of the system has found no evidence for coalescing material or hot close-in dust or circumstellar matter from an evaporating or exploding planet within a few astronomical units of the mature central star. It has also been hypothesized that the changes in brightness could be signs of activity associated with intelligent extraterrestrial life constructing a Dyson swarm; however, further analysis based on data until the end of 2017 showed wavelength-dependent dimming consistent with dust but not an opaque object such as an alien megastructure which would block all wavelengths of light equally.KIC 8462852 is not the only star that has large irregular dimmings, but all other such stars are young stellar objects called YSO dippers, which have different dimming patterns. An example of such an object is EPIC 204278916.New light fluctuation events of KIC 8462852 began in the middle of May 2017. Except for a period between late-December 2017 and mid-February 2018 when the star was obscured by the Sun, the fluctuations have been observed to have continued as of July 2018.