Tuesday, March 14, 2023 at 08:00 p.m
Astronomers have reported that two have been discovered Outer planets It orbits a Sun-like star 175 light-years away.
The newly discovered alien worlds, known as HIP 104045 b and HIP 104045 c, are classified as analogs of Jupiter and superplanet Neptune, respectively, RT reports.
The discovery is described in a research paper published in arXiv.The radial velocity (RV) method for exoplanet detection relies on detecting variations in the velocity of the central star due to the changing direction of the exoplanet’s gravitational pull. The Solar System It is invisible to the eye as it orbits the star.
Thanks to this technology, more than 600 exoplanets have been discovered so far.
A team of astronomers from scientific institutions in Brazil, the United States, and Italy, led by Diego Ferreira of the University of São Paulo in Brazil, announced the discovery of two new exoplanets using this radial velocity method.
They observed that the two exoplanets orbit a solar-type star called HIP 104045, about 175 light-years from Earth.
They were able to find the star using the HARPS High Resolution Radial Velocity Planet Finder attached to the European Southern Observatory’s (ESO) telescope in La Silla, Chile.
Observations made as part of the Solar Twin Planet Search (STPS) program led to the discovery of two massive worlds outside the solar system.
“In this paper, we present the discovery of two planets in the HIP 104045 system: the first is HIP 104045 c, a super-Neptune located close to the star, and the second is HIP 104045 b, a Jupiter-analog-like star orbiting the observed Sun,” the team wrote. Additional campaigns using the STPS project’s ESO/HARPS spectrometer have produced nearly 13 years of observations.”
HIP 104045 b is at least 0.5 Jupiter masses (159 Earth masses) and orbits its host star every 2,315 days, at a distance of about 3.46 AU.
At HIP 104045 c, it has a mass of 0.136 Jupiter masses (43.2 Earth masses) and an orbital period of 316 days, making it close to its parent star at a distance of about 0.92 AU. u
Scientists say HIP 104045 is a main-sequence star (the statistical sequence of about 80% of the various stars in the Universe) and is a relatively bright dwarf that is not red because it has not consumed all the hydrogen. Its core. It is of spectral type G5V, with a slightly larger size and mass than our Sun. Its effective temperature is 5,826 K (5,552,850 °C), and it is about as old as our Sun, with an estimated age of 4.5 billion years (the Sun’s age is estimated at 4.57 billion years).
Astronomers have noted that HIP 104045 exhibits a close resemblance to the Sun in terms of its shape and abundance of chemicals with less volatile inert elements compared to its solar twin.
Based on the thermal composition of HIP 104045 (which falls between the heat-inert Sun and its hotter solar twin), scientists speculate that it may have swallowed some rocky planetary material.