(ORDO NEWS) — Using radial velocity measurements, astronomers from China and Japan have discovered a new exoplanet orbiting a giant G-class star. The discovery is reported in a paper published Nov. 12 on the arXiv preprint server.
The Radial Velocity (RV) method is based on detecting changes in the speed of the central star due to the reversal of the gravitational pull of an unseen exoplanet as it orbits the parent star. Thanks to this method, more than 600 exoplanets have been discovered to date.
A team of astronomers reported the discovery of a new giant planet as a result of RV measurements using the HIDES spectrograph at the Okayama Astrophysical Observatory in Japan. The planet orbits the G-class star HD 167768, located about 353 light-years away.
The discovered exoplanet, designated HD 167768 b, is estimated to have a mass of at least 0.85 that of Jupiter. It revolves around its star every 20.65 days at a distance of about 0.15 AU.
The equilibrium temperature of this planet is 1874 K. The authors of the article classified HD 167768 b as a warm Jupiter.
The star HD 167768, estimated to be 5.3 billion years old, belongs to the spectral type G8 III. Its mass is about 1.08 solar masses. HD 167768 is 10 times larger than the Sun, has an effective temperature of 4851 K, and a metallicity of -0.75.
Given that HD 167768 is expected to ascend the red giant branch, astronomers predict that the planet will be engulfed by an expanding star in about 150 million years.
The researchers also suggest that at least two more planets may be present in the HD 167768 system, which have not yet been discovered. This assumption is based on two additional regular variations found in RV measurements.
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