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Free accessOther version: http://academic.oup.com/mnras/article/472/3/3230/4083634/Short-timescale-variables-in-the-Gaia-era
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Titles listShort time-scale variables in the gaia era: detection and characterization by structure function analysis
Titles listShort time-scale variables in the gaia era: detection and characterization by structure function analysis
Scientific Article
unige:112568 
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Short time-scale variables in the gaia era: detection and characterization by structure function analysis |
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| Published in | Monthly notices of the Royal Astronomical Society. 2017, vol. 472, no. 3, p. 3230-3245 | |
| Abstract | We investigate the capabilities of the ESA Gaia mission for detecting and characterizing short time-scale variability, from tens of seconds to a dozen hours. We assess the efficiency of the variogram analysis, for both detecting short time-scale variability and estimating the underlying characteristic time-scales from Gaia photometry, through extensive light-curve simulations for various periodic and transient short time-scale variable types. We show that, with this approach, we can detect fast periodic variability, with amplitudes down to a few millimagnitudes, as well as some M dwarf flares and supernovae explosions, with limited contamination from longer time-scale variables or constant sources. Time-scale estimates from the variogram give valuable information on the rapidity of the underlying variation, which could complement time-scale estimates from other methods, like Fourier-based periodograms, and be reinvested in preparation of ground-based photometric follow-up of short time-scale candidates evidenced by Gaia. The next step will be to find new short time-scale variable candidates from real Gaia data, and to further characterize them using all the Gaia information, including colour and spectrum. | |
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Article (Published version) (2.9 MB) - Free access Other version: http://academic.oup.com/mnras/article/472/3/3230/4083634/Short-timescale-variables-in-the-Gaia-era |
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| Citation (ISO format) | ROELENS, Maroussia et al. Short time-scale variables in the gaia era: detection and characterization by structure function analysis. In: Monthly Notices of the Royal Astronomical Society, 2017, vol. 472, n° 3, p. 3230-3245. doi: 10.1093/mnras/stx2115 https://archive-ouverte.unige.ch/unige:112568 |
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