Abstract
Calibration issues associated to scrambled collateral smear affecting the Kepler short-cadence data were discovered in the Data Release 24 and were found to be present in all the previous data releases since launch. In consequence, a new Data Release 25 was reprocessed to correct for these problems. We perform here a preliminary study to evaluate the impact on the extracted global seismic and background parameters between data releases. We analyze the sample of seismic solar analogs observed by Kepler in short cadence between Q5 and Q17. We start with this set of stars as it constitutes the best sample to put the Sun into context along its evolution, and any significant differences on the seismic and background parameters need to be investigated before any further studies of this sample can take place. We use the A2Z pipeline to derive both global seismic parameters and background parameters from the Data Release 25 and previous data releases and report on the measured differences.
Highlights
The study of the characteristics of solar analogs [1] of different ages is a very promising way to understand the evolution of the Sun
Calibration problems associated to collateral smear were detected in the Kepler Data Release 24 (DR24) and reprocessed corrected light curves were provided in DR25
We performed here a preliminary study to evaluate the impact on the global seismic parameters and on the background parameters between the two data releases
Summary
The study of the characteristics of solar analogs [1] of different ages is a very promising way to understand the evolution of the Sun. The selection of stars analog to the Sun will benefit from the inclusion of the detection of solar-like oscillations as an additional selection criterium. It is important to comprehend the impact of the calibration issues affecting the previous releases of Kepler data, and the differences and the possible bias with DR25 on the derived stellar parameters. The studied sample is rather small to perform a thorough statistical analysis, we provide initial inputs on the expected effects This sample constitutes the set of stars the most comparable to the Sun observed by Kepler and any possible inferences on the estimated stellar parameters due to issues in the data calibration should be known for each target before any further studies of this sample are performed
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