(ORDO NEWS) — An international team of astronomers using the radial velocity method has discovered the third planet in the star system HD 33142, located 397 light years from Earth in the constellation Hare. An article about this is posted on the electronic preprint site arXiv.org and will be published in the Astronomical Journal.
“Since the first discovery of exoplanets around a solar-type star in 1995, more than five thousand have already been found,” said lead author Trifon Trifonov, an astronomer at the German Institute for Astronomy of the Max Planck Society.
Most of them were discovered using the transit method, and the second one is the method of radial or radial velocities, or the Doppler method (which consists in the spectrometric measurement of the radial velocity of a star).
It allows us to reveal the structure of orbits in multiplanetary systems, which allows us to understand how the planets were formed and the evolution of their orbits proceeded.”
The star HD 33142, also referred to as HIP 23844 and BD-14 1051, is at least 2.7 billion years old, about four times larger and 1.5 times more massive than the Sun, belongs to the spectral type K and is at the very beginning of the red phase. giant.
It was already known that this star has two planets with the mass of Jupiter – HD 33142b with an orbital period of 330 days and HD 33142c with an orbital period of 830 days. Trifonov and his co-authors found strong evidence for the presence of another short-period planet the size of Saturn.
Planet HD 33142d is five times lighter than Jupiter and orbits its parent star once every 90 days. “We believe that HD 33142b, c and d are likely to be absorbed by an inflating red giant star over time,” the researchers explained.
The planet HD 33142d was discovered by processing observations from the HIRES spectrometers on the KECK 10-meter telescope on the top of Mauna Kea in Hawaii, FEROS on the ESO 2.2-meter telescope of the La Silla Observatory in Chile and HARPS on the 3.6-meter telescope the same observatory.
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