Did Astronomers Just Uncover a Planetary System Unlike Anything We’ve Seen?
Astronomers Uncover Star System with a Hot Jupiter and a Cold Super Jüpiter
Located in Ursa Major, about 300 light-years from Earth, astronomers have discovered an intriguing star system, HD 118203 (Liesma), which hosts two massive exoplanets. The first, detected in 2006, is a “Hot Jupiter,” while the second, revealed in a recent study, is a “Cold Super Jupiter” orbiting at a greater distance.
Discovery of HD 118203’s Planetary System
HD 118203, a G-type yellow dwarf, is slightly more massive and older than our Sun. The international team led by Gracjan Maciejewski from Nicolaus Copernicus University identified a Super Jupiter, HD 118203 c, with a mass up to eleven times that of Jupiter, orbiting its star at 6 AU (six times the Earth-Sun distance).
A Hierarchical System Confirmed by Doppler Observations
The discovery was made possible through Doppler spectroscopy, revealing HD 118203 b’s tight orbit and hinting at another massive companion. After years of observations, astronomers confirmed the existence of the Cold Super Jupiter in 2023, establishing HD 118203 as a hierarchical planetary system.
How General Relativity Keeps the System Stable
Despite the planets’ massive sizes and elongated orbits, the system remains stable over time. This stability is attributed to the effects of General Relativity, preventing the planets from destabilizing one another and ensuring a balanced orbital configuration.
A Closer Look at the Formation of Gas Giants
HD 118203’s unique configuration provides astronomers with a rare opportunity to study the formation of massive planets. Ongoing observations of the system may reveal additional exoplanets, helping to refine theories on gas giant formation and offering insights into our own Solar System’s evolution.
Source: Did Astronomers Just Uncover a Planetary System Unlike Anything We’ve Seen?
Truly Supermassive Black Hole Has Jets Spanning 23 Million Light-Years, The Biggest Ever Seen
Truly Supermassive Black Hole Has Jets Spanning 23 Million Light-Years, The Biggest Ever Seen
The jets shooting out from an enormous black hole are larger than was thought theoretically possible, and may change ideas about how galaxies developed. This pair are the longest, and therefore most powerful, jets we have yet found, with a combined length of 23 million light-years, more than 10 times the distance between the Milky Way and the Andromeda Galaxy.