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This discovery was made using PRL Advanced Radial-velocity Abu-sky Search (PARAS) optical fiber-fed spectrograph, the first of its kind in India, on the 1.2-meter Telescope of PRL at its Mt. Abu Observatory, the Bengaluru-headquartered space agency said in a statement.
Using PARAS, which can measure the mass of an exoplanet, the exoplanet’s mass is found to be 70 percent and size about 1.4 times that of Jupiter, it said.
These measurements were carried out between December 2020 and March 2021. Further follow-up measurements were also obtained from the TCES spectrograph from Germany in April 2021, and also independent photometric observations from the PRL’s 43-cm telescope at Mt. Abu.
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Because of the proximity of the planet to its host star, it is extremely heated with a surface temperature reaching up to 2000 K, and hence an inflated radius, making it one of the lowest density planets known (density of 0.31 gram per cc), it was noted.
Such close-in exoplanets around stars (with a distance less than 0.1 AU) with masses between 0.25 to a few Jupiter masses are called ”Hot-Jupiters”. ”The detection of such system enhances our understanding of various mechanisms responsible for inflation in hot-Jupiters and the formation and evolution of planetary systems around evolving and aging stars”, ISRO said. This is the second exoplanet discovered by PRL (an autonomous unit of the Department of Space) scientists using PARAS at 1.2 m Mt. Abu telescope; the first exoplanet K2-236b, a sub-Saturn size at 600 light-years away, was discovered in 2018.