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Planets orbiting from Earth before the turn of the century. TESS discovered the Jupiter-shaped exoplanet around the ancient binary star. According to an article to be published in the AAS Journal, the newly discovered circumbinary planet, named TIC 172900988b, is slightly larger than Jupiter and carries its two host stars.

A cast impression of TIC 17299009B and its two original stars. Dr. Weslin Kostov and his colleagues at NASA’s Goddard Space Flight Center wrote on their own: “Long before NASA’s Kepler Space Telescope discovered orbiting planets, astronomers had discussed the unusual observation signatures of such planets: the occurrence of multiple transits during a combination “. Paper.

“This effect is caused by the crossing of one or both stars on the planet, eclipsing the binary several times during a fraction of its orbital period.”

“The configuration of such transits depends on the speeds predicted by the sky in relation to the orbiting planets and the transits of the stars. Importantly, the orbital periods of these planets can be estimated by such transits, provided the host system is a double line Let be spectroscopic binary.

“Several groups of astronomers tried to track the transit of planets orbiting from Earth before the turn of the century, simple conjunction or not, but were eventually interrupted by time-limited sampling,” he said.

“Fortunately, thanks to its long stay and high photometric precision, the Kepler mission allowed the discovery of a dozen circumbinary transit planets and also demonstrated that the occurrence of pairs of transits during a conjunction is common.”

“Four of the eleven known circumbinary Kepler systems exhibit such transits: Kepler-16, Kepler-34, Kepler-35, and Kepler-1647.” TIC 172900988b is 1.01 times bigger than Jupiter and 11.07 times bigger than Earth.

With a mass of 2.9 Jupiter, it is the largest known orbiting planet, twice the size of the next largest planet, Kepler-1647b.

The orbital period of the planet is between 179 and 208 days and it is too hot to live in a habitable zone. This was found in data from NASA’s Transiting Exoplanet Survey Satellite (TESS) using multiple transit technology in conjunction.

Analysis of the light curve of the TIC18299009 binary system revealed one primary and two secondary eclipses with depths of 40% and 35%, respectively.

“TIC 172900988 was observed in the same region and the planet produced only two transits, one in each star, during the same conjunction,” the astronomers wrote.

The planet crossed the first star and then 5 days later it crossed the secondary star. The binary star itself is eclipsing with a duration of 19.7 days and a singularity of 0.45.

TIC 172900988 is approximately 824 light years distant in the Cancer zodiac. Also known as TYC 2483-160-1 and 2MASS J08343881 + 3133147, the system is 3.1 billion years old.

The researchers wrote: “TIC 172900988 demonstrates the discoverability of TESS for planets that orbit through orbital periods, much longer than the length of the observation window.”


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