Proper Motion of the Faint Star near KIC 8462852 (Boyajian's Star) - Not a Binary System

Dan P. Clemens, Kush Maheshwari, Roshan Jagani, J. Montgomery, A. M.El Batal, T. G. Ellis, J. T. Wright

Research output: Contribution to journalArticle

2 Scopus citations

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.

Original languageEnglish (US)
Article numberL8
JournalAstrophysical Journal Letters
Volume856
Issue number1
DOIs
StatePublished - Mar 20 2018

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Clemens, D. P., Maheshwari, K., Jagani, R., Montgomery, J., Batal, A. M. E., Ellis, T. G., & Wright, J. T. (2018). Proper Motion of the Faint Star near KIC 8462852 (Boyajian's Star) - Not a Binary System. Astrophysical Journal Letters, 856(1), [L8]. https://doi.org/10.3847/2041-8213/aab492