English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The recent claimed detection of g modes was obtained from the analysis of thepower spectrum of the time series of round-trip travel time of p modes. Thegoal of this paper is to reproduce these results on which the claims are basedfor confirming or invalidating the detection of g modes with the method used tomake the claims. We computed the time series of round-trip travel time usingthe procedure given in Fossat et al. (2017), and used different variations ofthe times series for comparison. We used the recently calibrated GOLF data(published in Paper I) with different sampling, different photomultipliers,different length of data for reproducing the analysis. We also correlated thepower spectrum with an asymptotic model of g-mode frequencies in a similarmanner to Fossat and Schmider (2018). We devised a scheme for optimising thecorrelation both for pure noise and for the GOLF data. We confirm the analysisperformed in Fossat et al. (2017) but draw different conclusions. Their claimsof detection of g modes cannot be confirmed when changing parameters such assampling interval, length of time series, or photomultipliers. Other instrumentsuch as GONG and BiSON do not confirm their detection. We also confirm theanalysis performed in Fossat and Schmider (2018), but again draw differentconclusions. For GOLF, the correlation of the power spectrum with theasymptotic model of g-mode frequencies for $l=1$ and $l=2$ show a highcorrelation at lag=0 and at lag corresponding to the rotational splitting$\nu_l$, but the same occurs for pure noise due to the large number of peakspresent in the model. In addition, other very different parameters defining theasymptotic model also provide a high correlation at these lags. We concludethat the detection performed in Fossat and Schmider (2018) is an artefact ofthe methodology.

Searching for g modes: Part II. Unconfirmed g-mode detection in the power spectrum of the time series of round-trip travel time