Astronomers discover a new exoplanet that looks like Jupiter

A new Jupiter-like exoplanet discovered by astronomers

The best-fitting in-phase folded orbital solution is HD 167768. Credit: Teng et al., 2022.

Using radial velocity measurements, astronomers from Japan and China have discovered 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 the solar system. The discovery was reported in a paper posted Nov. 12 on arXiv’s pre-print server.

The radial velocity (RV) method for detection exoplanet It is based on detecting variations in the velocity of the central star, due to the changing direction of the gravitational pull from an unseen exoplanet as it orbits the star. Thanks to this technology, more than 600 exoplanets have been discovered so far.

Now, a group of astronomers led by Huan-Yu Teng of the Tokyo Institute of Technology in Tokyo, Japan, has reported the discovery of a new giant planet as a result of RV measurements using the Echelle Spectrograph (HIDES) at the Okayama Astrophysical Observatory (OAO) in Japan. The planet orbits a deeply evolved G-type solar mass giant star Known as HD 167768, it is located around 353 light years far.

“For HD 167,768 RVs, we can find a strong signal at 20 days, which indicates regular variation in the time series,” the researchers explain.

The newly discovered exoplanet, named HD 167768 b, is estimated to have a mass of at least 0.85 that of Jupiter. It orbits its host every 20.65 days, at a distance of approximately 0.15 AU. The equilibrium temperature for this planet has been calculated to be 1,874 K.

Because of its criteria, the paper’s authors have classified HD 167768 b as a “warm Jupiter.” The planet turned out to have one of the shortest orbital periods ever found around deeply evolved stars using radial velocity methods.

The host star HD 167768, estimated to be 5.3 billion years old, is of spectral type G8 III, has a mass of about 1.08 solar masses, and is about 10 times more massive than the Sun. she has effective temperature at 4,851 K, and metallic at -0.75.

Given that HD 167768 is expected to level up Red giant branch, astronomers expect that its planet will be swallowed up in a relatively short time in astronomical terms. By analyzing orbital evolution, they estimate that HD 167768 b will be swallowed up by the expanding star in about 150 million years.

The researchers also hypothesize that at least two others planets It may be located in the HD 167768 system, and is still undetected. This assumption is based on the two additional regular changes identified in the RV measurements.

In the residue graph, there are two additional signals at 41 d and 95 d with FAP [false alarm probability] Just under 0.1 percent, indicating the presence of additional potential companions in the system.”

more information:
Huan-Yu Teng et al, A Close-in Planet Giant Orbiting Giant Star HD 167768, arXiv (2022). doi: 10.48550/arxiv.2211.06576

Journal information:

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