Proper Motion of the Faint Star near KIC 8462852 (Boyajian's Star) - Not a Binary System
arXiv:1803.03299 · doi:10.3847/2041-8213/aab492
Abstract
A faint star located 2 arcsec from KIC 8462852 was discovered in Keck 10 m adaptive optics imaging in the near-infrared (NIR) in 2014 by Boyajian et al. (2016). The closeness of the star to KIC 8462852 suggested the two could constitute a binary, which might have implications for the cause of the brightness dips seen by {\it Kepler} (Boyajian et al. (2016) and in ground-based optical studies Boyajian et al. (2018). Here, NIR imaging in 2017 using the Mimir instrument resolved the pair and enabled measuring their separation. The faint star had moved milliarcsec (mas) relative to KIC 8462852 since 2014. The relative proper motion of the faint star is mas yr, for a tangential velocity of km s if it is at the same 390 pc distance as KIC 8462852. Circular velocity at the 750 AU current projected separation is km s, hence the star pair cannot be bound.
arXiv comment10 pages, 2 figures
References in corpus (11)
- Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
- Planet Hunters X. KIC 8462852 - Where's the Flux?
- The Mauna Kea Observatories Near-Infrared Filter Set. III. Isophotal Wavelengths and Absolute Calibration
- Planet Hunters: The First Two Planet Candidates Identified by the Public using the Kepler Public Archive Data
- The Ĝ Infrared Search for Extraterrestrial Civilizations with Large Energy Supplies. II. Framework, Strategy, and First Result
- The Ĝ Search for Extraterrestrial Civilizations with Large Energy Supplies. IV. The Signatures and Information Content of Transiting Megastructures
- KIC 8462852: Transit of a Large Comet Family
- Families of Plausible Solutions to the Puzzle of Boyajian's Star
- The First Post-Kepler Brightness Dips of KIC 8462852
- KIC 8462852: Will the Trojans return in 2021?
- Mysterious eclipses in the light-curve of KIC8462852: a possible explanation