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

doi:10.3847/2041-8213/aab492

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 journal › Article

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 language	English (US)
Article number	L8
Journal	Astrophysical Journal Letters
Volume	856
Issue number	1
DOIs	https://doi.org/10.3847/2041-8213/aab492
State	Published - Mar 20 2018

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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

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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.",

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T1 - Proper Motion of the Faint Star near KIC 8462852 (Boyajian's Star) - Not a Binary System

AU - Clemens, Dan P.

AU - Maheshwari, Kush

AU - Jagani, Roshan

AU - Montgomery, J.

AU - Batal, A. M.El

AU - Ellis, T. G.

AU - Wright, J. T.

PY - 2018/3/20

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N2 - 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.

AB - 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.

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