Gold atoms, like all elements heavier than iron, were not created in the heart of stars, but in the incredibly energetic and chaotic events of supernova explosions. Here's a breakdown:

1. Stellar Fusion: Stars generate energy through nuclear fusion, fusing lighter elements like hydrogen and helium into heavier ones. This process continues until a star reaches a certain size, where it can fuse elements up to iron. Iron is very stable and its fusion doesn't release energy, so it effectively marks the end of the fusion process in a star's core.

2. Supernova Explosion: When a massive star runs out of fuel, its core collapses under its own gravity, causing a massive explosion called a supernova. This explosion unleashes tremendous energy, creating intense temperatures and pressures.

3. Neutron Capture: During a supernova, the intense heat and pressure causes the free neutrons present in the star's core to collide with existing atomic nuclei. This process is called neutron capture. The nuclei absorb these neutrons, becoming heavier elements.

4. Radioactive Decay: Some of the heavy elements created during neutron capture are unstable and decay into other elements. These radioactive decays eventually lead to the formation of stable gold atoms.

In summary, the high temperatures and pressures of a supernova allow for the rapid capture of neutrons by existing nuclei, creating heavier elements like gold, which weren't present in the original star.

It's important to note that while supernovae are the primary source of gold, other events like neutron star collisions also contribute to the creation of gold in the universe.