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AstronomersPhys Org
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88% Informative
A new technique uses a star's spectrum to chart variations in its temperature to the nearest tenth of a degree Celsius, over a range of time scales.
Temperature measurements are critical in the search for exoplanets, which are mostly observed indirectly by closely tracking their star.
The new technique made it possible to measure large variations in temperature.
The technique works not only with SPIRou and HARPS , but with any spectrograph operating in the visible or infrared range.
It would also be possible to use this technique with space-based instruments such as the James Webb Space Telescope .
For example, the team detected subtle temperature changes in star HD 189733 coinciding with the orbit of its exoplanet.
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