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Abstract
The internal gravity modes of the Sun are notoriously difficult to detect, and the claimed detection of gravity modes presented by Fossat et al. (Astron. Astrophys.604, A40, 2017) is thus very exciting. Given the importance of these modes for understanding solar structure and dynamics, the results must be robust. While Fossat et al. described their method and parameter choices in detail, the sensitivity of their results to several parameters was not presented. Therefore, we test the sensitivity of the results to a selection of the parameters. The most concerning result is that the detection vanishes when we adjust the start time of the 16.5-year velocity time-series by a few hours. We conclude that this reported detection of gravity modes is extremely fragile and should be treated with utmost caution.
Highlights
Despite the revelations about the solar internal structure and dynamics from helioseismology in the past 30 years, the deep core of the Sun has remained invisible
If the duty-cycle of a segment was less than 25%, Fragile Detection of Solar g-Modes
The reported signal appears to be linked to a combination of the start time of the Global Oscillations at Low Frequencies (GOLF) time series and the selected cadence of the round-trip travel-time measurement
Summary
Despite the revelations about the solar internal structure and dynamics from helioseismology in the past 30 years, the deep core of the Sun has remained invisible. This is because the most observed pressure modes (p-modes) are predominantly sensitive to the near-surface layers of the Sun. Gravity modes (g-modes) that probe the core of the Sun are evanescent in the convection zone and have small predicted amplitudes at the surface, making them difficult to detect García et al (2007), but to our knowledge, the results have not been reproduced using independent observations, and they remain controversial. Fossat et al (2017) provided their data publicly and described their method sufficiently well for us to qualitatively reproduce their results
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