Using Doppler spectroscopy, astronomers from Japan and China have discovered a new exoplanet.She is
Doppler spectroscopy, whichknown as the spectrometric measurement of the radial velocity of stars, is used to search for exoplanets. The method is based on detecting changes in the speed of the central star due to a change in the direction of the gravitational attraction of a potential exoplanet. Thanks to such spectroscopy, astronomers have found more than 600 objects to date.
Using Doppler spectroscopy, scientists have foundnew giant planet. They used the High Dispersion Echelle Spectrograph (HIDES) at the Okayama Astrophysical Observatory in Japan. The planet orbits an evolved G-class giant star HD 167768. It is close to Earth, only 353 light-years away.
Newly discovered exoplanet named HD167768 b. Its mass is estimated to be 0.85 that of Jupiter. It orbits its host star every 20.65 days at a distance of about 0.15 astronomical units. The equilibrium temperature of this planet is 1874 Kelvin (1600.85 °C).
One astronomical unit is approximately equal to the average distance from the Earth to the Sun. It currently stands at 149,597,870,700 meters.
Due to the parameters of the exoplanet, the authors of the articleclassified HD 167768 b as a warm Jupiter. It turned out that the planet has one of the shortest orbital periods ever found around deeply evolved stars using Doppler spectroscopy.
The parent star HD 167768, whose age isestimated at 5.3 billion years, belongs to the spectral class G8 III. Its mass is 1.08 solar and it is almost 10 times larger than our star. Its effective temperature is 4,851 K (4,577.85 °C).
HD 167768 will soon rise up the red branchgiants. Therefore, astronomers predict that the star will soon swallow the planet, and in a relatively short time by astronomical standards. Analyzing the orbital evolution, they calculated that HD 167768 b would be destroyed by an expanding star in about 150 million years.
The researchers also suggest that there may be at least two other planets in the HD 167768 system that have not yet been discovered.
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On the cover: an artist's impression of a hot Jupiter in a tight orbit around its host star.
Image courtesy of ATG Medialab/ESA