Protoplanet candidate EK Chamaeleontis b identified around a young red dwarf star

Researchers have identified a new protoplanet candidate, EK Chamaeleontis b (EK Cha b), orbiting a young red dwarf star known as EK Cha. This discovery, made using data from multiple high-resolution telescopes, reveals key signs of an object still in its formative stages, including its own potential disk of gas and dust. This finding helps bridge a gap in our knowledge of how giant planets form around smaller, cool stars.

Star system: EK Chamaeleontis | Distance from the Sun: 321 light years

The search for planets in the very early stages of their formation, known as protoplanets, remains a significant challenge in space observation. A new candidate, designated as EK Cha b, has been observed around the young red dwarf star EK Cha. This object is notable because it provides a rare opportunity to study planetary development within a gas-rich environment. While large gas planets are less common around red dwarf stars compared to larger stars, these cool, small stars represent a common class of hosts in our galaxy, making the study of their planetary systems important for understanding the diversity of planet formation.

To identify this candidate, researchers analyzed extensive archival data collected by several advanced facilities, including the Hubble Space Telescope, the Very Large Telescope, and the ALMA observatory. By combining various observational methods, such as tracking carbon monoxide gas emissions, measuring millimeter wavelength continuum light, and analyzing specific infrared brightness at 0.82 microns, the team successfully traced the signature of the candidate. The movement of the gas observed around EK Cha b appears consistent with the presence of a circumplanetary disk, which is a swirling ring of material that typically surrounds a developing planet.

Evolutionary models based on the collected data suggest that EK Cha b is a planetary mass companion. Although further observations are necessary to definitively confirm its nature, the current evidence marks a significant step forward. This detection demonstrates that it is now possible to probe the environments around red dwarf stars for early-stage planets, providing a new target for future investigations with next-generation telescopes.

Key findings
A new protoplanet candidate named EK Cha b was detected around a young red dwarf star.
The object was identified using a combination of carbon monoxide gas emissions and continuum light measurements.
Observations show gas movement that matches the expected behavior of a circumplanetary disk.
Evolutionary models classify the candidate as a planetary mass object.
The discovery expands the search for developing planets to red dwarf systems, which are often overlooked in planetary formation studies.

Scientific study

EK Cha b: multi-tracer detection of a protoplanet candidate in a gas-rich environment (external link)