The NASA K2 Mission has yet to observe an analog of Tabby's Star
Tabby's Star is a main sequence F-class star (KIC 8462852) observed by the NASA Kepler spacecraft to undergo significant aperiodic dimming activity across a four year baseline. The light curve was noted as novel amongst a pool of ~150,000 targets through visual inspection performed by participants of the PlanetHunters.org project. Boyajian, et al. (2015) reported an analysis which attempted to model the enigmatic behavior under various scenarios, with a swarm of exo-comets offered as a potential (but problematic) leading explanation. Subsequent follow-up studies failed to detect a significant IR excess or the presence of close stellar companions. Wright, et al. (2015) offered an alternative explanation invoking transits of alien-megastructures, which may not produce a detectable IR excess or radial velocity signal.
To date, a robust model to explain the behavior of Tabby's Star remains elusive.
The Kepler spacecraft is now observing a series of new ecliptic fields (K2) and has accumulated observations of ~165,000 additional targets. Continued visual inspection of these public data has failed to recover an analog to KIC 8462852. Lack of such a detection suggests that the aperiodic dimming indeed represents a rare astrophysical phenomenon, regardless of the true root cause mechanism involved. Future photometric surveys by K2 and TESS will offer additional opportunity to search for such analogs.
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