The James Webb Space Telescope (JWST), launched in December 2021, has provided significant insights into the cosmos. Carnegie Science astronomers, led by Alan Dressler who chaired the telescope's initial concept committee, have been involved in over two dozen JWST research teams, accumulating 1,328 observation hours.
Their work has led to several discoveries that challenge existing astrophysical models.
Key Discoveries by Carnegie Scientists Utilizing JWST
1. Moon Formation Observation
Sierra Grant utilized JWST to observe a moon-forming disk around the exoplanet CT Chamaeleontis b. Observations revealed that the material in the planet's moon-making disk differs chemically from the material in its host star's planet-making disk.
The planet's disk contained seven carbon-containing molecules, including benzene, while the star's disk showed no detectable carbon molecules.
This rapid chemical evolution, occurring over millions of years, may explain the diverse characteristics observed among Jupiter's moons.
2. Atmosphere on an Ultra-Hot Super-Earth
A team including Johanna Teske, Nicole Wallack, and Anjali Piette studied exoplanet TOI-561 b, an ultra-hot super-Earth with a surface temperature of 3,200 degrees Fahrenheit.
Despite models suggesting small, hot planets should not retain atmospheres, evidence indicates TOI-561 b possesses a thick atmosphere. The planet's observed temperature is significantly lower than a bare rock's predicted temperature (4,900°F), indicating heat distribution by an atmosphere.
This finding challenges current understanding of how rocky planets maintain atmospheres under extreme conditions.
3. Exoplanet with a Carbon Atmosphere
Peter Gao's team observed exoplanet PSR J2322-2650b. This Jupiter-sized planet, orbiting a rapidly spinning pulsar, is gravitationally deformed into a lemon shape.
Its atmosphere is composed of pure molecular carbon (C₃ and C₂ molecules) and helium, with evidence of soot clouds and internal diamond rain.
This planet is unique among the 150 planets studied by JWST in having detectable molecular carbon in its atmosphere, which challenges existing planet formation models.
4. Rapid Star Formation in Early Galaxies
Alan Dressler used data from the GLASS-JWST Early Release Science program to study galaxies approximately two billion years after the Big Bang. These infant galaxies exhibited