Observations utilizing the James Webb Space Telescope (JWST) have provided significant insights into the WD 1856 system. The system is located approximately 25 parsecs from Earth. The research focuses on the system’s sole known celestial body: a gas giant planet.
This planet is notably massive, estimated to be four to eleven times the mass of Jupiter, and possesses a radius about eight times that of its parent star’s remnant. Furthermore, it completes a full orbit in a very short period of only 1.4 days. For the first time, astronomers have analyzed the atmosphere of this planet using detailed spectroscopic measurements.
The findings revealed that the planet is significantly hotter than anticipated, registering a temperature of approximately 400 Kelvin—a reading 240 degrees higher than what could be accounted for by the light emitted from the white dwarf star. By integrating the precise measurements from the JWST with established models detailing the cooling processes of gas giants, the research team was able to reconstruct the planet’s evolutionary timeline. Since gas giants cool down at a predictable rate, their current temperature serves as a crucial indicator, or a “thermostat,” of their past thermal history.
This study marks a significant advancement in understanding exoplanetary atmospheres orbiting white dwarf stars.
Topics: #planet #star #only
