An asteroseismic constraint on the mass of the axion from the period drift of the pulsating DA white dwarf star L19-2

作者：Corsico Alejandro H^*; Romero Alejandra D; Althaus Leandro G; Garcia Berro Enrique; Isern Jordi; Kepler S O; Bertolami Marcelo M Miller; Sullivan Denis J; Chote Paul

来源：Journal of Cosmology and Astroparticle Physics, 2016, 2016(7): 036.

DOI：10.1088/1475-7516/2016/07/036

• axions
• stars
• white and brown dwarfs

We employ an asteroseismic model of L19-2, a relatively massive (M-* similar to 0.75M(circle dot)) and hot (T-eff similar to 12 100 K) pulsating DA (H-rich atmosphere) white dwarf star (DAV or ZZ Ceti variable), and use the observed values of the temporal rates of period change of its dominant pulsation modes (II similar to 113 s and II similar to 192 s), to derive a new constraint on the mass of the axion, the hypothetical non-barionic particle considered as a possible component of the dark matter of the Universe. If the asteroseismic model employed is an accurate representation of L19-2, then our results indicate hints of extra cooling in this star, compatible with emission of axions of mass m(a) cos(2) beta less than or similar to 25 meV or an axion-electron coupling constant of g(ae) less than or similar to 7 x 10(-13).

• 出版日期2016-7