A new sub-stellar companion around the young star HD 284149

TL;DR

This paper reports the discovery of a new sub-stellar companion, HD 284149 b, around a young star, providing valuable insights into star formation and cool atmosphere physics through direct imaging.

Contribution

It presents the first direct imaging detection of a sub-stellar companion around HD 284149, expanding knowledge of planetary and brown dwarf companions around young stars.

Findings

Discovery of HD 284149 b at 400 AU separation

Companion mass estimated between 18-50 M_Jup

Shared proper motion confirms physical association

Abstract

Even though only a handful of sub-stellar companions have been found via direct imaging, each of these discoveries has had a tremendous impact on our understanding of the star formation process and the physics of cool atmospheres. Young stars are prime targets for direct imaging searches for planets and brown dwarfs, due to the favorable brightness contrast expected at such ages and also because it is often possible to derive relatively good age estimates for these primaries. Here we present the direct imaging discovery of HD 284149 b, a 18-50 M_Jup companion at a projected separation of 400 AU from a young (25 Myr) F8 star, with which it shares common proper motion