Indian scientists discover star-planet bigger than Jupiter
PTI, Nov 17, 2021, 4:10 PM IST
Bengaluru: The exoplanet search and study group at the Ahmedabad-based Physical Research Laboratory (PRL), has discovered a new exoplanet orbiting too close to an evolved or aging star with a mass of 1.5 times that of the Sun and located 725 light-years away, according to Indian Space Research Organisation.
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.
The star is known as HD 82139 as per the Henry Draper catalog and TOI 1789 as per the TESS catalog. Hence, the planet is known as TOI 1789b or HD 82139b as per the IAU nomenclature. The discovery team led by Prof. Abhijit Chakraborty includes students and team members, and international collaborators from Europe and the US. This newly discovered star-planet system is very unique — the planet orbits the host star in just 3.2 days, thus placing it very-very close to the star at a distance of 0.05 AU (roughly one-tenth the distance between Sun and Mercury). There are less than 10 such close-in systems known among the zoo of exoplanets known so far.
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.
Udayavani is now on Telegram. Click here to join our channel and stay updated with the latest news.
Top News
Related Articles More
Felling of trees: What is being done to restore Delhi Ridge? SC asks DDA
UP govt to install 150,000 toilets for Maha Kumbh, set up paying guest facilities
Sexual harassment case cannot be closed on basis of compromise between parties: SC
BJP slams Rahul Gandhi over his recent opinion piece, calls it ‘laughable’
I’m not anti-business, I’m anti-monopoly: Rahul
MUST WATCH
Latest Additions
Felling of trees: What is being done to restore Delhi Ridge? SC asks DDA
Kinnigoli: Truck carrying red stone collides with Auto-Rickshaw; driver injured
UP govt to install 150,000 toilets for Maha Kumbh, set up paying guest facilities
Kavoor Police arrest two notorious cattle thieves
Udupi: Unidentified body found near Bailkere’s Vidhyodaya School
Thanks for visiting Udayavani
You seem to have an Ad Blocker on.
To continue reading, please turn it off or whitelist Udayavani.