UNITED STATES (OBSERVATORY NEWS) — The exoplanet, designated G 9-40b, is located in the dwarf system of spectral class M just 91 light years from Earth.
This object was originally discovered in 2019 using the NASA Kepler spacecraft during the second phase of its mission, called K2.
Exoplanet was discovered by the transit method. However, there remained the possibility that the results obtained by Kepler were caused by exposure to a background star rather than an exoplanet.
A new study using the Habitable-zone Planet Finder (HPF) instrument, a spectrograph mounted on a 10-meter Hobby-Eberly telescope, confirmed that the object found was an exoplanet.
G 9-40b is approximately twice the size of the Earth. Observations allowed us to determine the upper limit of its mass – it is approximately 12 earth masses.
Star G 9-40, around which the exoplanet rotates, makes a complete revolution around its own axis every 29 days and has a surface temperature of about 3,100 degrees (the temperature of the Sun is about 5,500 degrees Celsius).
“G 9-40b is one of the 20 transit exoplanets closest to Earth, which makes this discovery truly exciting. Due to its considerable transit depth, the G 9-40b is an excellent candidate for studying the composition of the atmosphere using next-generation telescopes,” said Gudmundur Stefansson, lead author of the study.
It is planned that the exoplanet will be studied using the James Webb Space Telescope, which will be launched in 2021.
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