Indian scientists discover star-planet bigger than Jupiter
Bengaluru Nov 17 PTI 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 15 times that of Sun and located 725 light years away according to Indian Space Research OrganisationThis 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 12 metre Telescope of PRL at its Mt Abu Observatory the Bengaluru-headquartered space agency said in a statementUsing PARAS which has the capability to measure mass of an exoplanet the exoplanets mass is found to be 70 per cent and size about 14 times that of the Jupiter it saidThese measurements were carried out between December 2020 and March 2021 Further follow-up measurements were also obtained from TCES spectrograph from Germany in April 2021 and also independent photometric observations from the PRLs 43-cm telescope at Mt AbuThe star is known as HD 82139 as per the Henry Draper catalogue and TOI 1789 as per the TESS catalogue Hence the planet is known as TOI 1789b or HD 82139b as per the IAU nomenclatureThe discovery team led by Prof Abhijit Chakraborty includes students and team members and international collaborators from Europe and the USThis newly discovered star-planet system is very unique — the planet orbits the host star in just 32 days thus placing it very-very close to the star at a distance of 005 AU roughly one tenth the distance between Sun and MercuryThere are less than 10 such close-in systems known among the zoo of exoplanets known so far Because of the close 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 031 gram per cc it was notedSuch close-in exoplanets around stars with distance less than 01 AU with masses between 025 to a few Jupiter mass are called Hot-JupitersThe 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 saidThis is the second exoplanet discovered by PRL an autonomous unit of the Department of Space scientists using PARAS at 12 m Mt Abu telescope the first exoplanet K2-236b a sub-Saturn size at 600 light-years away was discovered in 2018 PTI RS ROH ROH
Bengaluru Nov 17 PTI 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 15 times that of Sun and located 725 light years away according to Indian Space Research OrganisationThis 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 12 metre Telescope of PRL at its Mt Abu Observatory the Bengaluru-headquartered space agency said in a statementUsing PARAS which has the capability to measure mass of an exoplanet the exoplanets mass is found to be 70 per cent and size about 14 times that of the Jupiter it saidThese measurements were carried out between December 2020 and March 2021 Further follow-up measurements were also obtained from TCES spectrograph from Germany in April 2021 and also independent photometric observations from the PRLs 43-cm telescope at Mt AbuThe star is known as HD 82139 as per the Henry Draper catalogue and TOI 1789 as per the TESS catalogue Hence the planet is known as TOI 1789b or HD 82139b as per the IAU nomenclatureThe discovery team led by Prof Abhijit Chakraborty includes students and team members and international collaborators from Europe and the USThis newly discovered star-planet system is very unique — the planet orbits the host star in just 32 days thus placing it very-very close to the star at a distance of 005 AU roughly one tenth the distance between Sun and MercuryThere are less than 10 such close-in systems known among the zoo of exoplanets known so far Because of the close 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 031 gram per cc it was notedSuch close-in exoplanets around stars with distance less than 01 AU with masses between 025 to a few Jupiter mass are called Hot-JupitersThe 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 saidThis is the second exoplanet discovered by PRL an autonomous unit of the Department of Space scientists using PARAS at 12 m Mt Abu telescope the first exoplanet K2-236b a sub-Saturn size at 600 light-years away was discovered in 2018 PTI RS ROH ROH
