Super-Nyquist Asteroseismology with Future Space Missions
Presentation
Paper/Presentation Title | Super-Nyquist Asteroseismology with Future Space Missions |
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Presentation Type | Presentation |
Authors | Shibahashi, Hiromoto (Author) and Murphy, Simon J. (Author) |
Editors | Ballot, Jerome, Vauclair, Sylvie and Vauclair, Gerard |
Journal or Proceedings Title | Proceedings of the Physics of Oscillating Stars Conference (PHOST 2018) |
Number of Pages | 13 |
Year | 2018 |
Web Address (URL) of Paper | https://zenodo.org/record/1494781 |
Conference/Event | PHOST - Physics of Oscillating Stars (2018) |
Event Details | PHOST - Physics of Oscillating Stars (2018) Event Date 02 to end of 07 Sep 2018 Event Location Banyuls-sur-mer (France) |
Abstract | We propose a photometric technique for future space missions that overcomes the problem of Nyquist aliases. These aliases result from typically long cadences of observation imposed by telemetry constraints. The proposed method is to introduce a periodic modulation to the sampling rate. Suitable combinations of the frequency and the amplitude of this modulation allow the true peaks to be distinguished from the aliases. We provide an analytical proof of the validity of this method and some demonstrations with simulated data. We also propose to divide a long cadence into two unequal parts, aiming at reproducing the intrinsic amplitude spectrum of stars without a severe smearing effect due to long exposures. The two exposures can be summed to recover the photon statistics if the user is interested in doing so. Based on these proposals, a specific recommendation for the PLATO mission is made to maximise its capability of photometry for asteroseismology, without serious interference with its other scientific missions. |
Keywords | Astrophysics - Solar and Stellar Astrophysics; Astrophysics - Instrumentation and Methods for Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Byline Affiliations | University of Tokyo, Japan |
University of Sydney | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q73w1/super-nyquist-asteroseismology-with-future-space-missions
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