Retrieving the Atmopsheres of WISE 2150AB, a rare widely separated L+T binary system

The WISE 2150-7520AB system is one of only three widely separated L+T brown dwarf binaries, with the secondary only recently discovered by the Backyard Worlds: Planet 9 citizen science program. By examining the atmospheres of the L1+T8 system in detail we can better understand their thermal profiles, chemical composition, and cloud properties that are tightly coupled with their formation and evolution. In this work, I use atmospheric retrievals to examine the atmospheres of WISE 2150AB. We test cloudless and cloudy models as well as a variety of chemical models. Here I present results from our atmospheric retrievals and compare them to retrievals of the widely separated L+T binary, SDSS J1416+1348AB.

Theme(s): Cool Stars as Stellar Systems, Brown Dwarfs and Giant Exoplanets: Future Prospects and Thirty Years of Discovery