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Astronomers detect new Jupiter-like exoplanet

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Phase-folding optimal trajectory solution for HD 167768. Credit: Teng et al., 2022.

Using radial velocity measurements, Japanese and Chinese astronomers have detected a new exoplanet orbiting a G-type giant star. The newly discovered alien world is similar in mass to Jupiter, but much hotter than the largest planet in our solar system. The findings are reported in his paper published Nov. 12 on the arXiv preprint server.

Radial Velocity (RV) method for detecting exoplanet It is based on detecting changes in the central star’s velocity due to changes in the direction of the gravitational pull from invisible exoplanets orbiting the star. More than 600 exoplanets have been detected so far thanks to this technology.

A group of astronomers led by Huan-Yu Teng at the Tokyo Institute of Technology in Tokyo now reports the discovery of a new giant planet as a result of RV measurements using the High Dispersion Echelle Spectrometer (HIDES) at the Okayama Astrophysical Observatory. Yes (OAO) in Japan.The planet is orbiting a deeply evolved solar mass G-type giant star Known as HD 167768, it is located at approximately 353 locations. light year over there.

“For HD 167768 RV, we were able to find a strong signal in 20 days, which indicates a regular variation over time,” the researchers explained.

The newly detected exoplanet, designated HD 167768 b, is estimated to have a mass of at least 0.85 times the mass of Jupiter. It orbits its host every 20.65 days at a distance of about 0.15 AU. The planet’s equilibrium temperature was calculated to be 1,874 K.

Because of its parameters, the paper’s authors classified HD 167768 b as a “warm Jupiter.” The planet was found to have one of the shortest orbital periods ever discovered around a deeply evolved star using the radial velocity method.

The primary star HD 167768 has an estimated age of 5.3 billion years, spectral type G8 III, and a mass of about 1.08 that of the Sun, which is about 10 times that of the Sun.that is effective temperature 4,851 K, its metallicity is at the -0.75 level.

Given that HD 167768 is expected to rise, red giant branch, astronomers predict that the planet will be swallowed up in a relatively short astronomical time. By analyzing its orbital evolution, they estimate that HD 167768 b will be engulfed by an expanding star within about 150 million years.

The researchers also found that at least two other planet HD 167768 may be present on the system but has not yet been detected. This assumption is based on two additional regular fluctuations identified in the RV measurements.

“In the residual periodogram, there are two additional signals at 41 and 95 days using FAP. [false alarm probability] Slightly lower than 0.1%, suggesting there may be an extra mate in the system,” the scientist notes.

For more information:
Huan-Yu Teng et al, Giant Star Orbiting Nearby Planet HD 167768, arXiv (2022). DOI: 10.48550/arxiv.2211.06576

Journal information:

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Quote: Astronomers Detect New Jupiter-Like Exoplanet (Nov 23, 2022) from https://phys.org/news/2022-11-astronomers-jupiter-like-exoplanet.html 2022 Obtained on November 23, 2015

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