Astronomers detect new Jupiter-like exoplanet

Tomasz Nowakowski is a member of the physics.org community.

Astronomers from Japan and China have discovered a new planet around a giant star. The solar system's biggest planet is much hotter than the alien world. There is a paper on the arXiv pre-print server.

TheRV method is used to detect exoplanets because of the changing direction of the gravitational pull from an unseen exoplanet as it passes in front of the star. More than 600 exoplanets have been found thanks to this technique.

A group of astronomer led by Huan-Yu Teng of the Tokyo Institute of Technology in Tokyo, Japan, have found a giant planet using the HIgh Dispersion Echelle Spectrograph at Okayama Astrophysical Observatory. The planet is located some 353 light years away from the sun.

The researchers found a signal at 20 d that indicated a regular variation in the time series.

HD 167768 b is believed to have a mass of at least 0.85 Jupiter mass. It travels at a distance of approximately 0.15AU per day. The equilibrium temperature of this planet was determined.

HD 167768 b has been classified as a "warm Jupiter" due to its parameters. The planet has been found to have one of the shortest orbital periods ever found around a deep-sea star.

The host star HD 167768 is 10 times larger than the sun and has a mass of 1.08 solar mass. It has an effective temperature of 4,851 K and a metallicity of - 0.75.

The astronomer predicts that HD 167768 will be swallowed in a relatively short time. They think that HD 167 b will be engulfed by the expanding star within 150 million years.

At least two other planets may be present in the HD 167768 system. There are two additional regular variations identified in the RV measurement.

"In the periodogram of the residuals, there are two additional signals at 41 d and 95 d with FAP slightly lower than 0.1 percent, suggesting possible extra companions in the system."

There is more information about A Close-in Planet Orbiting Giant Star HD 167. There is a book titled "arxiv.2211.06576."

Journal information: arXiv

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