New Delhi: Scientists at the AHMedabad-based physical research laboratory (PRL), under the Department of Space, have found new exoplanets orbiting too close to evolving stars or aging with a mass of 1.5 times the sunlight and located 725 light years .
The exoplanet mass was found 70% and a size of about 1.4 times the Jupiter.
This discovery was made using advanced radial-velocity sophisticated fiber spectrograph (Paras), the first of its kind in India, on a 1.2 meter telescope located in the Observatory of Mount Abu.
The invention team includes Prof.
Abhijit Chakraborty, students and members of his team, and international collaborators from Europe and the US, an ISRO statement stated.
This is the second exoplanet found by PRL scientists using the paras.
The first exoplanet K2-236B, sub-saturn size at 600 light years away, was found in 2018.
Measurement associated with exoplanet found between December 2020 and March 2021.
Further follow-up measurements were also obtained from the TCES spectograph from Germany in April 2021.
Stars found known as HD 82139 in accordance with the Henry Draper catalog (which has a spectroscopic classification for 225,300 stars) and TOI 1789 according to the TESS catalog.
Therefore, the planet is known as TOI 1789B or HD 82139B according to the nomenclature of international astronomical unions, he said.
The newly found planetary star system is very unique – the planet orbits the host star in just 3.2 days, so it places it very close to the star at a distance of 0.05 au (about a tenth of the distance between the sun and mercury).
There are less than 10 close-in systems like that among exoplanet zoos.
Because it is close to the planet to the host star, it is heated with surface temperatures reaching up to 2000K, and therefore the radius is increasing, making it one of the planets of the lowest known density (0.31 GM per cc).
Close to such exoplanets around the stars with a mass between 0.25 to several Jupiter masses called ‘hot-jupiters’.
“Such system detection will contribute to our understanding of the mechanism responsible for inflation in Jupiter’s heat and also provides an opportunity to understand the evolution of planets around stars that leave the main order branch,” Chakraborty said in his quote.
His team included Willksha Khandelwal and Rishikesh Sharma from PRL and Priyanka Chaturvedi from Thüringer Landessernwarte Tautenburg (Institute of Space Astrophysics), Germany.
The discovery work has been published in the monthly notification of the referee journal of the royal astronomy community, titled “Jupiter’s Discovery of Heat Increasing Around the Stars Who Growing Toi-1789”.