Revisiting the Impact of Stellar Magnetic Activity on the Detectability of Solar-Like Oscillations by Kepler

• DOI: 10.3389/fspas.2019.00046
• Publication Date: 2019-07-10T10:02:36Z
• Authors: Savita Mathur; Rafael A. García; Lisa Bugnet; Ângela R.G. Santos; Netsha Santiago; Paul G. Beck
• Keywords: Rotation period; Oscillation (cell signaling); Stellar rotation; Asteroseismology

Over 2,000 stars were observed for one month with a high enough cadence in order to look acoustic modes during the survey phase of \kep\ mission. Solar-like oscillations have been detected about 540 stars. The question why no remaining is still open. Previous works explained non-detection level magnetic activity However, sample studied contained some classical pulsators and red giants that could biased results. In this work, we revisit analysis on cleaner main-sequence solar-like consists 1,014 First compute predicted amplitude oscillation compare it noise at frequency power spectrum. We find an ratio larger than 0.94. measure reliable rotation periods associated photometric index 684 out full particular 323 where be detected. among these 32\% them Sun its maximum activity, explaining modes. Interestingly, cannot primary reason responsible absence detectable 68% without periods. investigate metallicity, inclination angle axis, binarity as possible causes low mode amplitudes. Using spectroscopic observations subsample, metallicity suppressed No clear correlation nor found. also derive lower limit our (of 20-30\,ppm) below which are not Finally, conclude 2,000ppm 98.3% probability having