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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
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Official URL: http://dx.doi.org/10.3847/1538-4357/abc626
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 | ||||||||||||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||||||||||||
| Divisions: | Faculty of 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 | ||||||||||||||||||
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| 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 | ||||||||||||||||||
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