At all wavelengths, the ratio of the planet's brightness to that of the star is quite modest, but it will be greater in the infrared than in the visible spectrum.
The sole technique that can directly photograph exoplanets orbiting far-off stars is direct imaging. The method produces tangible evidence and provides more information about the planet, including its orbit and atmosphere's makeup, to scientists.
One of its advantages is that when seen in the near infrared, dust is transparent to it. As a result, a star covered in dust would be invisible to an optical telescope, but its emission would be detectable by one that operates in the near infrared.
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