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The pulsating White Dwarf G117-B15A : still the most stable optical clock known

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Kepler, S. O., Winget, D. E., Vanderbosch, Zachary P., Castanheira, Barbara Garcia, Hermes, J. J., Bell, Keaton J., Mullally, Fergal, Romero, Alejandra D., Montgomery, M. H., DeGennaro, Steven, Winget, Karen I., Chandler, Dean, Jeffery, Elizabeth J., Fritzen, Jamile K., Williams, Kurtis A., Chote, Paul and Zola, Staszek (2020) The pulsating White Dwarf G117-B15A : still the most stable optical clock known. The Astrophysical Journal, 906 (1). 7. doi:10.3847/1538-4357/abc626 ISSN 0004-637X.

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Official URL: http://dx.doi.org/10.3847/1538-4357/abc626

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Abstract

The pulsating hydrogen atmosphere white dwarf star G 117-B15A has been observed since 1974. Its main pulsation period at 215.19738823(63) s, observed in optical light curves, varies by only (5.12 ± 0.82) × 10−15 s s−1 and shows no glitches, as pulsars do. The observed rate of period change corresponds to a change of the pulsation period by 1 s in 6.2 million yr. We demonstrate that this exceptional optical clock can continue to put stringent limits on fundamental physics, such as constraints on interaction from hypothetical dark matter particles, as well as to search for the presence of external substellar companions.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): White dwarf stars, Pulsating stars
Journal or Publication Title: The Astrophysical Journal
Publisher: Institute of Physics Publishing, Inc.
ISSN: 0004-637X
Official Date: 29 December 2020
Dates:
DateEvent
29 December 2020Published
28 October 2020Accepted
Volume: 906
Number: 1
Article Number: 7
DOI: 10.3847/1538-4357/abc626
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 1 March 2021
Date of first compliant Open Access: 29 December 2021
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
DE-SC0010623U.S. Department of Energyhttp://dx.doi.org/10.13039/100000015
AST 1707419National Science Foundationhttp://dx.doi.org/10.13039/501100008982
DE-NA0003843U.S. Department of Energyhttp://dx.doi.org/10.13039/100000015
80NSSC20K0455[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
AST-1903828National Science Foundationhttp://dx.doi.org/10.13039/501100008982
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