The planet, named HD 21749b, orbits a bright, nearby dwarf star which lies about 53 light-years away from Earth in the faint constellation Reticulum and appears to have the longest orbital period of the three planets so far identified by TESS.
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HD21749b is a "sub-Neptune" which is about three times bigger than the Earth, which means that it is gaseous rather than rocky. But HD 21749b is composed of intensive material compared to the gaseous world we use because it is 23 times more massive than the Earth.
There is a possibility that the temperature of the surface of the new planet may be around 300 degrees Fahrenheit - relatively quiet, given its proximity to its star, as the brightness of the star is almost as bright as the sun.
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“Because there was an interruption in data around that time, we initially didn’t see a second transit and were pretty disappointed. But we re-extracted the data and zoomed in to look more carefully, and found what looked like the end of the transit.” Dragomir said.
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Using the HARPS, a different group of astronomers had studied the HD 21749 system a decade ago, which notice the small stars and detects the planets that inspire their gravitational stars in their host stars. Those researchers also detected an indication, but they could not decisively feature it for a planet, said Dragomir.
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Dragomir and her team also used data collected from Planet Finder Spectrograph, which is a tool installed on the Magellan II telescope in Chile, which is to pursue their findings and inhibit the HD 21749b's mass and orbital parameters.
Researchers today announced the discovery of the American Astronomical Society's 233rd meeting in Seattle. They have also presented their research paper to Astrophysical Journal Letters.
TESS is just starting. The mission has already given green signal to hundreds of planet candidates, and its confirmed search will run in thousands when all is said and done, NASA officials have said. And some of these world astronomers will be closer to the Earth to study planets using powerful instruments, such as NASA's $ 8.9 billion James Web Space Telescope, which is about to be launched in 2021.
Once TESS has completed two years of supervision of the entire sky, the science team has expressed commitment to provide information on 50 small planets in less than four times the size of Earth to the astronomy community for further follow-up, either with ground-based telescopes or the future James Webb Space Telescope.