Astronomers report the discovery of two new exoplanets orbiting a sun-like star 175 light-years away. The newly discovered alien worlds, known as HIP 104045 b and HIP 104045 c, have been classified as the Jupiter analogue and the superplanet Neptune, respectively. The discovery is detailed in a paper published March 2 on a preprint server arXiv.
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 of an unseen exoplanet as it orbits the star. Thanks to this technology, more than 600 exoplanets have been discovered so far.
Now, a team of astronomers led by Thiago Ferreira of the University of São Paulo in Brazil, has reported the discovery of two new exoplanets using the RV method. They observed solar-type star HIP 104045 with the High-Resolution Radial Velocity Planet Search (HARPS) instrument on the European Southern Observatory’s (ESO) 3.6-meter telescope in La Silla, Chile. The observations, conducted as part of the Solar Twin Planet Search (STPS) program, have led to the discovery of two massive exoplanet worlds.
In this paper, we present two discoveries planets In the HIP 104045 system: HIP 104045 c, a super-Neptune located near the star, and HIP 104045 b, a second Jupiter analog orbiting a sun-like star observed using the ESO/HARPS spectrometer for STPS. Plus additional campaigns make up nearly 13 years of observations.”
HIP 104045 b has a minimum mass of about 0.5 Jupiter masses and orbits about host star every 2315 days, at a distance of about 3.46 astronomical units from it. When it comes to HIP 104045 c, it has a mass of at least 0.136 that of Jupiter and an orbital period of 316 days. This super-Neptune exoplanet lies about 0.92 AU from its parent star.
HIP 104045 is a relatively bright non-reddish main sequence solar star of spectral type G5V with a size and mass a few percent greater than that of the Sun. The star has an effective temperature of 5,826 K and an estimated age of 4.5 billion years.
the Astronomy scientists Note that HIP 104045 presents a high similarity to the Sun in terms of its chemical abundance pattern, which has a lower amount of refractory/volatile elements when compared to its solar twins. They hypothesize that HIP 104045’s moderate refractory enhancement means that it may have swallowed some rocky planetary material.
Based on the thermal composition of HIP 104045, which lies between those of the heat-poor Sun and most heat-rich solar twins (Meléndez et al. 2009), we initially hypothesized that its planetary system might resemble our own system—gas and ice giants that inhabit the region. The outer (𝑎 > 3 AU) and inner are inhabited by rocky planets, the paper’s authors conclude.
Thiago Ferreira et al. Jupiter and a cool super-Neptune counterpart orbiting solar twin star HIP 104045, arXiv (2023). doi: 10.48550/arxiv.2303.01358
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