Long-term archive data revealed the hidden world
A group of researchers has confirmed the presence of another companion orbiting the star Beta Pictoris. The object, now labelled Beta Pictoris d, is the third known planet in that system. Its detection relied on the careful re-examination of observational material collected over a period exceeding ten years.
The newly found body is exceptionally dim. Relative to Beta Pictoris b, the first planet identified in the same stellar neighbourhood, it emits roughly one hundred times less light. This places Beta Pictoris d among the lowest-mass exoplanets ever captured in images taken from the ground.
- Beta Pictoris d is the third planet known in its system
- The planet is about 100 times fainter than Beta Pictoris b
- Archival records spanning over a decade were reanalysed
- Initial detection used the ESO Very Large Telescope
The first clear sign of the planet came from observations made with the European Southern Observatory's Very Large Telescope. Once the faint source was seen, the team inspected earlier datasets and recognised the same object across the full span of past measurements, where it had previously escaped notice. The extended archive proved essential to the finding.
The case demonstrates the lasting value of historical telescope data for planetary searches. Bodies that went unrecognised when first recorded can later be brought to light through improved inspection of material gathered years before.