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Frequency Modulation of Directly Imaged Exoplanets: Geometric Effect as a Probe of Planetary Obliquity | | Hajime Kawahara
; | | Date: |
9 Mar 2016 | | Abstract: | We consider the time-frequency analysis of a scattered light curve by a
directly imaged exoplanet. We show that the geometric effect due to planetary
obliquity and orbital inclination induce the frequency modulation of the
apparent diurnal periodicity. We construct a model of the frequency modulation
and compare with the instantaneous frequency extracted from the pseudo-Wigner
distribution of the simulated light curves of a cloudless Earth. The model
provides good agreement with the simulated modulation factor even for the light
curve with Gaussian noise comparable to the signal. Notably, the shape of the
instantaneous frequency is sensitive to the difference between prograde,
retrograde, and pole-on spin rotations. Whereas our technique requires the
static property of the albedo map, it does not need to solve the albedo map of
the planet. The time-frequency analysis is complementary to other methods which
utilize the amplitude modulation. This paper demonstrates the importance of the
frequency domain of the photometric variability to the characterization of
directly imaged exoplanet in future. | | Source: | arXiv, 1603.2898 | | Services: | Forum | Review | PDF | Favorites | |
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