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High-resolution spectroscopy of Boyajian’s star during optical dimming events
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Martínez González, M. J., González-Fernández, C, Asensio Ramos, A., Socas-Navarro, H., Westendorp Plaza, C., Boyajian, T. S., Wright, J. T., Collier Cameron, A., González Hernández, J. I., Holgado, G., Kennedy, Grant M., Masseron, T., Molinari, E., Saario, J., Simón-Díaz, S. and Toledo-Padrón, B. (2019) High-resolution spectroscopy of Boyajian’s star during optical dimming events. Monthly Notices of the Royal Astronomical Society, 486 (1). pp. 236-244. doi:10.1093/mnras/stz850 ISSN 1745-3933.
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Official URL: http://dx.doi.org/10.1093/mnras/stz850
Abstract
Boyajian's star is an apparently normal main-sequence F-type star with a very unusual light curve. The dipping activity of the star, discovered during the Kepler mission, presents deep, asymmetric, and aperiodic events. Here we present high-resolution spectroscopic follow-up during some dimming events recorded post-Kepler observations, from ground-based telescopes. We analyse data from the HERMES, HARPS-N, and FIES spectrographs to characterize the stellar atmosphere and to put some constraints on the hypotheses that have appeared in the literature concerning the occulting elements. The star's magnetism, if existing, is not extreme. The spots on the surface, if present, would occupy 0.02 per cent of the area, at most. The chromosphere, irrespective of the epoch of observation, is hotter than the values expected from radiative equilibrium, meaning that the star has some degree of activity. We find no clear evidence of the interstellar medium or exocoments being responsible for the dimmings of the light curve. However, we detect at 1-2σ level, a decrease of the radial velocity of the star during the first dip recorded after the Kepler observations. We claim the presence of an optically thick object with likely inclined and high impact parameter orbits that produces the observed Rossiter-McLaughlin effect.
Item Type: | Journal Article | |||||||||||||||
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Subjects: | Q Science > QB Astronomy | |||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||
Library of Congress Subject Headings (LCSH): | Stars, Circumstellar matter | |||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||||||||
Publisher: | Oxford University Press | |||||||||||||||
ISSN: | 1745-3933 | |||||||||||||||
Official Date: | June 2019 | |||||||||||||||
Dates: |
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Volume: | 486 | |||||||||||||||
Number: | 1 | |||||||||||||||
Page Range: | pp. 236-244 | |||||||||||||||
DOI: | 10.1093/mnras/stz850 | |||||||||||||||
Status: | Peer Reviewed | |||||||||||||||
Publication Status: | Published | |||||||||||||||
Reuse Statement (publisher, data, author rights): | This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record M J Martínez González, C González-Fernández, A Asensio Ramos, H Socas-Navarro, C Westendorp Plaza, T S Boyajian, J T Wright, A Collier Cameron, J I González Hernández, G Holgado, G M Kennedy, T Masseron, E Molinari, J Saario, S Simón-Díaz, B Toledo-Padrón, High-resolution spectroscopy of Boyajian’s star during optical dimming events, Monthly Notices of the Royal Astronomical Society, Volume 486, Issue 1, June 2019, Pages 236–244, https://doi.org/10.1093/mnras/stz850 is available online at: https://doi.org/10.1093/mnras/stz850 | |||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||
Date of first compliant deposit: | 24 April 2019 | |||||||||||||||
Date of first compliant Open Access: | 25 April 2019 | |||||||||||||||
RIOXX Funder/Project Grant: |
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