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Near-infrared observations of dusty white dwarfs

Published online by Cambridge University Press:  09 October 2020

Laura K. Rogers Open the ORCID record for Laura K. Rogers [Opens in a new window] ,
Siyi Xu ,
Amy Bonsor ,
Simon Hodgkin ,
Kate Y. L. Su ,
Ted von Hippel  and
Michael Jura
Laura K. Rogers
Affiliation:
Institute of Astronomy, University of Cambridge, Madingley Rd, Cambridge, CB3 0HA, UK email: laura.rogers@ast.cam.ac.uk
Siyi Xu
Affiliation:
Gemini Observatory, 670 N. A’ohoku Place, Hilo, HI96720, USA
Amy Bonsor
Affiliation:
Institute of Astronomy, University of Cambridge, Madingley Rd, Cambridge, CB3 0HA, UK email: laura.rogers@ast.cam.ac.uk
Simon Hodgkin
Affiliation:
Institute of Astronomy, University of Cambridge, Madingley Rd, Cambridge, CB3 0HA, UK email: laura.rogers@ast.cam.ac.uk
Kate Y. L. Su
Affiliation:
Steward Observatory, University of Arizona, 933 N Cherry Avenue, Tucson, AZ85721, USA
Ted von Hippel
Affiliation:
Department of Physical Sciences, Embry-Riddle Aeronautical University, Daytona Beach, FL32114, USA
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Planetary material in the atmospheres of white dwarfs is thought to be scattered inwards from outer planetary systems. Dusty emission in the infrared traces the accretion. As the scattering of many small asteroids is a stochastic process, variability in the infrared emission is predicted. We report a 3 year near-infrared (J, H and K) monitoring campaign of 34 dusty, polluted white dwarfs which aims to search for dust emission variability. We find all white dwarfs have consistent near-infrared fluxes, implying the excess emission is stable. This suggests tidal disruption events which lead to large variabilities are rare and quick (<1 year) and become stable within a few years. For WD 0408–041, the system that shows both increases and decreases in dust emission over 11 years, our K band data suggest a potential colour change associated with the dust emission that needs further confirmation.

Keywords

white dwarfsplanetary systemsminor planetsasteroids
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S357: White Dwarfs as Probes of Fundamental Physics: Tracers of Planetary, Stellar and Galactic Evolution , October 2019 , pp. 33 - 36
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of International Astronomical Union

Footnotes

†

Deceased

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