Second alien world discovered in planetary system HD 83443

(ORDO NEWS) — Astronomers report the discovery of yet another exoplanet around a nearby star known as HD 83443. The newly discovered extrasolar world is a Jupiter-mass planet orbiting its star in a highly eccentric 22-year orbit. The results of the study were detailed in an article published April 12 on the arXiv preprint server.

The star HD 83443, located 133 light-years away, is a solar-mass K0 star with a metallicity more than twice that of the Sun.

This star is estimated to be 2.64 billion years old and has an effective temperature of about 5429 K. HD 83443 is known to host a “hot Jupiter” exoplanet (designated HD 83443 b) with a mass of about 0.41 Jupiter masses, which orbits around it about every three days.

Now, a team of astronomers led by Adriana Errico at the University of South Queensland in Australia is reporting the discovery of another giant planet orbiting HD 83443, as suggested by previous studies.

The discovery was the result of an analysis of radial velocity data from four instruments: the University College London Spectrograph (UCLES) at the 3.9-m Anglo-Australian Telescope (AAT), the High Resolution Spectrometer (HIRES) at the Keck Telescope, the high-precision planet finder with radial velocity (HARPS) at the 3.6-m ESO La Silla telescope, as well as the MINERVA-Australis array of telescopes at the Mount Kent Observatory.

“HD 83443 has been observed by four precision radial velocity instruments for over 22 years. Here we provide detailed information on the observations with each instrument,” the researchers write in their paper.

The newly discovered planet has been designated HD 83443 c. The results show that this planet has a dynamical mass of about 1.5 that of Jupiter and orbits its star every 22.6 years at a distance of about 8 AU. From him.

The astronomers stressed that HD 83443 c is orbiting its parent star in an unusually highly eccentric orbit, measuring 0.76 in size. According to the authors of the study, such a high eccentricity suggests that a scattering event could send HD 83443 b into a close orbit, leaving HD 83443 c on a wide and eccentric path.

They even suggest that a third, less massive (with a mass less than 0.4 Jupiter masses) could have been involved in this mixing and then been ejected from the system.

The researchers noted that HD 83443 is a surprisingly rare example of a well-studied system containing both a hot Jupiter and a highly eccentric giant planet.

Summing up, astronomers emphasize the need for further study of this system in order to shed more light on the properties of the newfound planet. They suggest that HD 83443 c may even be the target of future space missions.

“Although the host star is quite far away (∼ 41 pc) and dim (Vmag ∼ 8), the planet could potentially be photographed by future missions when it approaches periapsis, which will happen in about 10 years,” the authors of the paper concluded.


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