Boyajian's star: Has the mystery been solved?

KIC 8462852, also known as the Boyajian's star, underwent several events of strong brightness variations during 4 years of Kepler observations, which are unlike to that of any other known astronomical object. Since 2017, we have been embarking an a follow-up campaign of this target using the 10m GTC telescope. This covered several dips of that star's flux and showed a clear color-signature in these events. These observations are compatible with the hypothesis by Neslusan & Budaj of a pool of dusty planetesimals that may occasionally pass close to the star. Their optically thin dust shroud might then generate the observed colors. However, while current observations support this scenario, they do not prove it. Alternative explanations for the star’s behavior still need to be considered. In particular, variations in the temperature of the stellar surface are evaluated for their compatibility with the observations. Furthermore, an update on the follow-up observations with input from new data acquired in the first half of 2018 will be given.

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