When we look beyond our solar system, we see objects that blur the lines between planets and stars. Astronomers refer to these objects assubstellar objects, falling within the size range between planets and stars. One type of substellar object is the brown dwarf, which forms from the collapse of a gas cloud like a star but lacks the mass to fuse hydrogen in its core. Some brown dwarfs can briefly fuse heavier forms of hydrogen, such asdeuteriumbut are not massive enough to emit starlight. Others are small and cold, allowing the formation of complex atmospheres.
In the star-forming region IC 348 within the Milky Way, astronomers have recently discovered a new type of substellar object using data from JWST’s near-infrared spectrometer (JWST NIR spec). This object is a free-floating, star-like entity with a mass ranging from 0.2% to 1.2% of the Sun’s mass, containing carbon-containing molecules known as hydrocarbons in its atmosphere. Referred to as H-type objects, these entities exhibit characteristics of brown dwarfs but are smaller and show evidence of hydrocarbons.
Research conducted by Richard J. Parker and Catalina Alves de Oliveira involved analyzing IC 348’s stellar and substellar objects alongside running simulations to understand the formation of H-type objects. They questioned whether these objects originate from collapsing gas clouds like brown dwarfs and stars or develop around a host star and later travel freely through space, resembling planets.
By examining observation data and conducting simulations over 10 million years, researchers found that these H-type objects likely represent a new subcategory of very small brown dwarfs rather than escaped planets. The precise formation mechanisms of these objects remain a topic of debate among astronomers, who continue to explore this fascinating area of substellar astronomy.
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Source: sciworthy.com
