@article{614b37cf7d2a498eb9745c2d12ab0714,
title = "Proper Motion of the Faint Star near KIC 8462852 (Boyajian's Star) - Not a Binary System",
abstract = "A faint star located 2 arcsec from KIC 8462852 was discovered in Keck 10 m adaptive optics imaging in the JHK near-infrared (NIR) in 2014 by Boyajian et al. (2016). The closeness of the star to KIC 8462852 suggested that the two could constitute a binary, which might have implications for the cause of the brightness dips seen by Kepler and in ground-based optical studies. Here, NIR imaging in 2017 using the Mimir instrument resolved the pair and enabled measuring their separation. The faint star had moved 67 ± 7 milliarcsec (mas) relative to KIC 8462852 since 2014. The relative proper motion of the faint star is 23.9 ± 2.6 mas yr-1, for a tangential velocity of 45 ± 5 km s-1 if it is at the same 390 pc distance as KIC 8462852. Circular velocity at the 750 au current projected separation is 1.5 km s-1, hence the star pair cannot be bound.",
author = "Clemens, {Dan P.} and Kush Maheshwari and Roshan Jagani and J. Montgomery and Batal, {A. M.El} and Ellis, {T. G.} and Wright, {J. T.}",
note = "Funding Information: W.M. Keck Foundation. Support for the Mimir instrument and this scientific effort have been made possible by grants AST 06-07500, AST 09-07790, AST 14-12269 from NSF/MPS and NNX15AE51G from NASA to Boston University and by Perkins telescope observing time awarded as part of the Boston UniversityLowell Observatory Discovery Channel Telescope partnership. Funding Information: The authors thank T. Boyajian and the anonymous reviewer for comments and suggestions. The Boston University Research Internships in Science and Engineering (RISE) program for accomplished rising high school seniors selected and supported the participation of K.M. and R.J. on this project. This publication made use of data products from the Two Micron All-Sky Survey, a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by NASA and NSF. The Center for Exoplanets and Habitable Worlds is supported by the Pennsylvania State University, the Eberly College of Science, and the Pennsylvania Space Grant Consortium. This research was conducted in part using the Mimir instrument, jointly developed at Boston University and Lowell Observatory and supported by NASA, NSF, and the W.M. Keck Foundation. Support for the Mimir instrument and this scientific effort have been made possible by grants AST 06-07500, AST 09-07790, AST 14-12269 from NSF/MPS and NNX15AE51G from NASA to Boston University and by Perkins telescope observing time awarded as part of the Boston University—Lowell Observatory Discovery Channel Telescope partnership. Facility: Perkins. Publisher Copyright: {\textcopyright} 2018. The American Astronomical Society. All rights reserved.",
year = "2018",
month = mar,
day = "20",
doi = "10.3847/2041-8213/aab492",
language = "English (US)",
volume = "856",
journal = "Astrophysical Journal Letters",
issn = "2041-8205",
publisher = "IOP Publishing Ltd.",
number = "1",
}