ISRO scientists discover an exoplanet larger than Jupiter


The exoplanet research and study group at the Ahmedabad-based Physics Research Laboratory (PRL) has discovered a new exoplanet orbiting too close to an evolved or aging star with a mass 1.5 times that of the Sun and that is it is 725 light years distant. according to the Indian Space Research Organization.

This discovery was made using a fiber optic powered PRL Advanced Radial-velocity Abu-sky Search (PARAS) spectrograph, the first of its kind in India, on the 1.2-meter PRL telescope at its Mt. Abu Observatory, The Bengaluru-based space agency said in a statement.

Using PARAS, which has the ability to measure the mass of an exoplanet, the exoplanet’s mass is found to be 70 percent and the size of about 1.4 times that of Jupiter, he said. These measurements were made between December 2020 and March 2021.

Further follow-up measurements were also obtained from Germany’s TCES spectrograph in April 2021, as well as independent photometric observations from the 43-cm PRL telescope at Mt. Abu. The star is known as HD 82139 according to the Henry Draper catalog and TOI 1789 according to the TESS catalog.

Therefore, the planet is known as TOI 1789b or HD 82139b according to the IAU nomenclature. The discovery team led by Professor Abhijit Chakraborty includes students and team members, and international collaborators from Europe and the United States. This newly discovered star-planet system is very unique: the planet orbits the host star in just 3.2 days, putting it very, very close to the star at a distance of 0.05 AU (about one-tenth of the distance between the Sun and Mercury). ).

There are less than 10 of these known close systems among the exoplanet zoo known so far. Due to the close proximity of the planet to its host star, it becomes extremely hot with a surface temperature reaching up to 2000 K and thus an inflated radius, making it one of the lowest-density planets known (density of 0.31 grams per cc). , it was noticed.

These close exoplanets around stars (less than 0.1 AU apart) with masses between 0.25 and a few Jupiter masses are called “hot Jupiters.”

“Detection of such a system improves our understanding of various mechanisms responsible for inflation in hot Jupiters and the formation and evolution of planetary systems around evolving and aging stars,” said ISRO. This is the second exoplanet discovered by PRL scientists (an autonomous unit of the Department of Space) using PARAS on the 1.2 m Mt. Abu telescope; The first exoplanet K2-236b, a sub-Saturn size 600 light years away, was discovered in 2018.

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