Elemental composition is an essential factor in the chemistry of planetary and brown dwarf atmospheres; however, the majority of low-temperature objects near the Sun have nearly indistinguishable abundance patterns. In this talk, I will review some of the key findings of the JWST Cycle 3 "Arcana of the Ancients" program, which obtained NIRSpec and

Ultra-hot rocky exoplanets above 1700 K may possess dayside temperatures that are hot enough to have their surfaces vaporize and become a silicate vapor atmosphere. Secondary eclipse thermal emission can efficiently probe for the presence of these atmospheres on a rocky planet. We observed single JWST MIRI/LRS secondary eclipses for 10 ultra-hot

While the influence of supermassive black hole (SMBH) activity on habitability has garnered attention, the specific effects of active galactic nuclei (AGN) winds, particularly ultrafast outflows (UFOs), on planetary atmospheres remain largely unexplored. This study aims to fill this gap by investigating the relationship between SMBH mass at the