Details

Autor(en) / Beteiligte

• 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
• Zola, Staszek

Titel

The Pulsating White Dwarf G117-B15A: Still the Most Stable Optical Clock Known

Ist Teil von

• The Astrophysical journal, 2021-01, Vol.906 (1), p.7

Ort / Verlag

Philadelphia: The American Astronomical Society

Erscheinungsjahr

2021

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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.