The GALEX View of “Boyajian’s Star” (KIC 8462852)

James. R. A. Davenport, Kevin R. Covey, Riley W. Clarke, Zachery Laycock, Scott W. Fleming, Tabetha S. Boyajian, Benjamin T. Montet, Bernie Shiao, Chase C. Million, David J. Wilson, Manuel Olmedo, Eric E. Mamajek, Daniel Olmedo, Miguel Chávez, Emanuele Bertone

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The enigmatic star KIC 8462852, informally known as “Boyajian’s Star,” has exhibited unexplained variability from both short timescale (days) dimming events, and years-long fading in the Kepler mission. No single physical mechanism has successfully explained these observations to date. Here we investigate the ultraviolet variability of KIC 8462852 on a range of timescales using data from the GALEX mission that occurred contemporaneously with the Kepler mission. The wide wavelength baseline between the Kepler and GALEX data provides a unique constraint on the nature of the variability. Using 1600 s of photon-counting data from four GALEX visits spread over 70 days in 2011, we find no coherent NUV variability in the system on 10-100 s or month timescales. Comparing the integrated flux from these 2011 visits to the 2012 NUV flux published in the GALEX-CAUSE Kepler survey, we find a 3% decrease in brightness for KIC 8462852. We find that this level of variability is significant, but not necessarily unusual for stars of similar spectral type in the GALEX data. This decrease coincides with the secular optical fading reported by Montet & Simon. We find that the multi-wavelength variability is somewhat inconsistent with typical interstellar dust absorption, but instead favors a {R}V=5.0+/- 0.9 reddening law potentially from circumstellar dust.
Original languageEnglish
Pages (from-to)130
JournalAstrophysical Journal
Volume853
Issue number2
DOIs
Publication statusPublished - 1 Feb 2018
Externally publishedYes

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Kepler mission
stars
dimming
fading
timescale
counting
brightness
dust
photons
wavelength
wavelengths

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Davenport, J. R. A., Covey, K. R., Clarke, R. W., Laycock, Z., Fleming, S. W., Boyajian, T. S., ... Bertone, E. (2018). The GALEX View of “Boyajian’s Star” (KIC 8462852). Astrophysical Journal, 853(2), 130. https://doi.org/10.3847/1538-4357/aaa413
Davenport, James. R. A. ; Covey, Kevin R. ; Clarke, Riley W. ; Laycock, Zachery ; Fleming, Scott W. ; Boyajian, Tabetha S. ; Montet, Benjamin T. ; Shiao, Bernie ; Million, Chase C. ; Wilson, David J. ; Olmedo, Manuel ; Mamajek, Eric E. ; Olmedo, Daniel ; Chávez, Miguel ; Bertone, Emanuele. / The GALEX View of “Boyajian’s Star” (KIC 8462852). In: Astrophysical Journal. 2018 ; Vol. 853, No. 2. pp. 130.
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Davenport, JRA, Covey, KR, Clarke, RW, Laycock, Z, Fleming, SW, Boyajian, TS, Montet, BT, Shiao, B, Million, CC, Wilson, DJ, Olmedo, M, Mamajek, EE, Olmedo, D, Chávez, M & Bertone, E 2018, 'The GALEX View of “Boyajian’s Star” (KIC 8462852)', Astrophysical Journal, vol. 853, no. 2, pp. 130. https://doi.org/10.3847/1538-4357/aaa413

The GALEX View of “Boyajian’s Star” (KIC 8462852). / Davenport, James. R. A.; Covey, Kevin R.; Clarke, Riley W.; Laycock, Zachery; Fleming, Scott W.; Boyajian, Tabetha S.; Montet, Benjamin T.; Shiao, Bernie; Million, Chase C.; Wilson, David J.; Olmedo, Manuel; Mamajek, Eric E.; Olmedo, Daniel; Chávez, Miguel; Bertone, Emanuele.

In: Astrophysical Journal, Vol. 853, No. 2, 01.02.2018, p. 130.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The GALEX View of “Boyajian’s Star” (KIC 8462852)

AU - Davenport, James. R. A.

AU - Covey, Kevin R.

AU - Clarke, Riley W.

AU - Laycock, Zachery

AU - Fleming, Scott W.

AU - Boyajian, Tabetha S.

AU - Montet, Benjamin T.

AU - Shiao, Bernie

AU - Million, Chase C.

AU - Wilson, David J.

AU - Olmedo, Manuel

AU - Mamajek, Eric E.

AU - Olmedo, Daniel

AU - Chávez, Miguel

AU - Bertone, Emanuele

PY - 2018/2/1

Y1 - 2018/2/1

N2 - The enigmatic star KIC 8462852, informally known as “Boyajian’s Star,” has exhibited unexplained variability from both short timescale (days) dimming events, and years-long fading in the Kepler mission. No single physical mechanism has successfully explained these observations to date. Here we investigate the ultraviolet variability of KIC 8462852 on a range of timescales using data from the GALEX mission that occurred contemporaneously with the Kepler mission. The wide wavelength baseline between the Kepler and GALEX data provides a unique constraint on the nature of the variability. Using 1600 s of photon-counting data from four GALEX visits spread over 70 days in 2011, we find no coherent NUV variability in the system on 10-100 s or month timescales. Comparing the integrated flux from these 2011 visits to the 2012 NUV flux published in the GALEX-CAUSE Kepler survey, we find a 3% decrease in brightness for KIC 8462852. We find that this level of variability is significant, but not necessarily unusual for stars of similar spectral type in the GALEX data. This decrease coincides with the secular optical fading reported by Montet & Simon. We find that the multi-wavelength variability is somewhat inconsistent with typical interstellar dust absorption, but instead favors a {R}V=5.0+/- 0.9 reddening law potentially from circumstellar dust.

AB - The enigmatic star KIC 8462852, informally known as “Boyajian’s Star,” has exhibited unexplained variability from both short timescale (days) dimming events, and years-long fading in the Kepler mission. No single physical mechanism has successfully explained these observations to date. Here we investigate the ultraviolet variability of KIC 8462852 on a range of timescales using data from the GALEX mission that occurred contemporaneously with the Kepler mission. The wide wavelength baseline between the Kepler and GALEX data provides a unique constraint on the nature of the variability. Using 1600 s of photon-counting data from four GALEX visits spread over 70 days in 2011, we find no coherent NUV variability in the system on 10-100 s or month timescales. Comparing the integrated flux from these 2011 visits to the 2012 NUV flux published in the GALEX-CAUSE Kepler survey, we find a 3% decrease in brightness for KIC 8462852. We find that this level of variability is significant, but not necessarily unusual for stars of similar spectral type in the GALEX data. This decrease coincides with the secular optical fading reported by Montet & Simon. We find that the multi-wavelength variability is somewhat inconsistent with typical interstellar dust absorption, but instead favors a {R}V=5.0+/- 0.9 reddening law potentially from circumstellar dust.

U2 - 10.3847/1538-4357/aaa413

DO - 10.3847/1538-4357/aaa413

M3 - Article

VL - 853

SP - 130

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

ER -

Davenport JRA, Covey KR, Clarke RW, Laycock Z, Fleming SW, Boyajian TS et al. The GALEX View of “Boyajian’s Star” (KIC 8462852). Astrophysical Journal. 2018 Feb 1;853(2):130. https://doi.org/10.3847/1538-4357/aaa413