Discovery of a magnetic white dwarf with unusual short-period variability

Aleks Scholz; Joe Llama; Koraljka Muzic; Sarah Faller; Dirk Froebrich; Beate Stelzer

doi:10.3847/2515-5172/aaadbf

Discovery of a magnetic white dwarf with unusual short-period variability

Aleks Scholz
, Joe Llama
, Koraljka Muzic
, Sarah Faller
, Dirk Froebrich
, Beate Stelzer

Research output: Contribution to journal › Article › peer-review

Abstract

We report the discovery of a magnetic white dwarf which shows periodicvariability with P=110 min, color-dependent amplitudes and a transientphase shift in the blue compared to the red lightcurve - a previouslyunknown type of variability for this type of object. We attribute thevariations either to a close ultracool (thus far undetected) companionor, more likely, to magnetic spots with unusual temperature structure.

Original language	English
Article number	27
Journal	Research Notes of the AAS
Volume	2
Issue number	1
DOIs	https://doi.org/10.3847/2515-5172/aaadbf
Publication status	Published - 12 Feb 2018

Keywords

Stars: magnetic field
Stars: peculiar
Starspots
White dwarfs

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10.3847/2515-5172/aaadbf

Scholz-2018-Discovery-of-a-RNAAS-AAM
© 2018, American Astronomical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.3847/2515-5172/aaadbf
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http://adsabs.harvard.edu/abs/2018RNAAS...2...27S

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Astronomy at St Andrews 2015-2018: Astronomy at St Andrews 2015-2018
Jardine, M. (PI), Cameron, A. (CoI), Cyganowski, C. (CoI), Horne, K. (CoI) & Wood, K. (CoI)
Science & Technology Facilities Council
1/04/15 → 31/03/18
Project: Standard

Cite this

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AU - Llama, Joe

AU - Muzic, Koraljka

AU - Faller, Sarah

AU - Froebrich, Dirk

AU - Stelzer, Beate

PY - 2018/2/12

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AB - We report the discovery of a magnetic white dwarf which shows periodicvariability with P=110 min, color-dependent amplitudes and a transientphase shift in the blue compared to the red lightcurve - a previouslyunknown type of variability for this type of object. We attribute thevariations either to a close ultracool (thus far undetected) companionor, more likely, to magnetic spots with unusual temperature structure.

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KW - Stars: peculiar

KW - Starspots

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Discovery of a magnetic white dwarf with unusual short-period variability

Abstract

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Astronomy at St Andrews 2015-2018: Astronomy at St Andrews 2015-2018

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