A recent study directly images four new brown dwarfs. Brown dwarfs are mysterious celestial bodies that fall between the heaviest planets and the lightest stars, exhibiting both stellar and planetary traits. These perplexing objects' hybrid nature makes them essential for advancing our knowledge of
This illustration depicts a brown dwarf – an object that is too heavy to be characterized as a planet, but not massive enough to power itself by nuclear fusion the way stars do. Credit: NASA’s Goddard Space Flight CenterBrown dwarfs are mysterious celestial bodies that fall between the heaviest planets and the lightest stars, exhibiting both stellar and planetary traits. These perplexing objects’ hybrid nature makes them essential for advancing our knowledge of both large planets and stars.
Image of the brown dwarf discovered around the star HIP 21152, obtained with the Very Large Telescope SPHERE instrument. Credit:With just around 40 systems seen in over three decades of searching, direct detections of brown dwarf companions to stars have remained relatively sparse despite great efforts in the development of new observational equipment and image processing technologies.
. This is the first time that multiple new systems with brown dwarf companions have been announced at the same time.Dr. Mariangela Bonavita, School of Physical Sciences, The Open University. Credit: Mariangela Bonavita “An alternative approach to increase the number of detections is to only observe stars that show indications of an additional object in their system”, explains Clémence Fontanive. For example, the way a star moves under the gravitational tug of a companion can be an indicator of the existence of that companion, whether it is a star, a planet, or something in between.
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