'Ultra-hot Jupiter' KELT-9b study reveals atmospheric thermometer around hottest exoplanet

Researchers at Cornell University have led an in-depth study into exoplanet KELT-9b popularly kwn as 'ultra-hot' Jupiter in order to discover more about exoplanet's transmission spectrum.  study which was published in journal of American Astromical Society was led by Jake Turner of Cornell University along with a team of scientists who discovered that absorption lines along exoplanet act as atmospheric 'rmometers'. 

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Called as 'ultra-hot' Jupiter, exoplanet KELT-9b clocks a dayside temperature of more than 4,500 K (~7,600 °F). It is hottest planet kwn, hotter than many stars too! This ultra-hot Jupiter orbits at a mere 0.035 AU from its scalding A- or B- host star in just 1.5 days.

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Absorption lines act as atmospheric rmometers

high temperature of this planet accompanied with intense riation should dissociate molecules into ir component atoms and ionize metals in hot atmosphere. energetic light should even inflate envelope of hydrogen gas around planet to point where hot gas escapes. However, for second time, presence of ionized calcium, Ca II, was discovered in KELT-9b's atmospheric spectra along with a prominent Ha absorption, confirming existence of an extended envelope of hydrogen surrounding irriated planet. 

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Turner and scientists were able to identify pressures, altitudes, and temperatures of lines in atmosphere by modeling this atmospheric spectra. It was found that Ca II lines probe atmosphere at an altitude of about 1.32-1.40 times planet's rius. Ha line provides information from higher up, at 1.44 planetary rii. Toger, se absorption lines act as 'atmospheric rmometers,' providing an atmospheric temperature profile of hottest planet and yielding insight into energy that enters and leaves planet's atmosphere.

(With ANI Inputs)

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