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Astrophysics

Euclid: Early Release Observations -- A glance at free-floating new-born planets in the sigma Orionis cluster

E. L. Martín, M. Žerjal

Featured May 30, 2026

Original Paper

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Simply

Using new telescope images, scientists found tiny, free-floating planets in a star cluster and showed that the number of these objects doesn't drop off sharply, challenging ideas about how they form.

In depth
The study leverages the unprecedented sensitivity and resolution of the Euclid space mission to identify new free-floating planet (FFP) candidates in the Orionis cluster. By developing a high-purity photometric selection method based on known substellar benchmarks, the authors extend the cluster's initial mass function (IMF) down to approximately 4 Jupiter masses, revealing no significant steepening at the planetary-mass end.

Key Takeaways

  • 1
    The paper demonstrates the Euclid mission's capability to detect faint, very low-mass objects, including free-floating planets, in nearby star-forming regions.
  • 2
    A high-purity photometric selection method is developed using benchmark substellar objects to effectively filter out contamination from background galaxies and foreground sources.
  • 3
    The initial mass function (IMF) of the Orionis cluster is extended to lower planetary masses, showing consistency with a power-law distribution without a steepening at the planetary-mass end.

Conceptual Flow

HIGH LEVEL
1
Methodology: Finding Tiny Planets

Scientists used a new space telescope to take very clear pictures, then carefully sorted through them to find small, free-floating planets by checking their brightness and shape.

Telescope Images
Known Planets
Filter & Compare
New Planet Candidates
2
Results: Counting the Smallest Objects

They counted how many objects of different sizes were found, from big stars to tiny planets, and discovered that there are still many small planets, even down to Jupiter's size.

Planet Sizes
Number Found
Plot & Analyze
No Sharp Drop-off