Time-scales of close-in exoplanet radio emission variability

Time - scales of Radio Emission in PSR J 0437 - 4715 at 327 MHz

X-ray variability time scales in Active Galactic Nuclei

X-ray variability in Active Galactic Nuclei (AGN) is commonly analysed in terms of the Power Spectral Density (PSD). The break observed in the power spectrum can be interpreted as a characteristic X-ray variability time scale. Here we study variability properties within the framework of clumpy accretion flows, in which shocks between accreting elements account for the UV and X-ray emissions. We...

Exoplanet atmosphere. Thermal structure of an exoplanet atmosphere from phase-resolved emission spectroscopy.

Exoplanets that orbit close to their host stars are much more highly irradiated than their solar system counterparts. Understanding the thermal structures and appearances of these planets requires investigating how their atmospheres respond to such extreme stellar forcing. We present spectroscopic thermal emission measurements as a function of orbital phase ("phase-curve observations") for the ...

Temperature Responses to Spectral Solar Variability on Decadal Time Scales

[1] Two scenarios of spectral solar forcing, namely Spectral Irradiance Monitor (SIM)‐based out‐of‐phase variations and conventional in‐phase variations, are input to a time‐dependent radiative‐convective model (RCM), and to the GISS modelE. Both scenarios and models give maximum temperature responses in the upper stratosphere, decreasing to the surface. Upper stratospheric peak‐to‐ peak respon...

THE BROADBAND INFRARED EMISSION SPECTRUM OF THE EXOPLANET HD 189733b

We present Spitzer Space Telescope time series photometry of the exoplanet system HD 189733 spanning two times of secondary eclipse, when the planet passes out of view behind the parent star. We estimate the relative eclipse depth in 5 distinct bands and find the planet-to-star flux ratio to be 0.256±0.014% (3.6 μm), 0.214±0.020% (4.5 μm), 0.310 ± 0.034% (5.8 μm), 0.391 ± 0.022% (8.0 μm), and 0...