Fundamental Properties of Cool Brown Dwarfs with JWST: A Progress Report

Michael Cushing

University of Toledo

While great progress has been made over the last 20 years in determining the fundamental properties of brown dwarfs, the coolest brown dwarfs with Teff < 500 K have proven difficult to characterize because of their intrinsic faintness and the fact that their spectral energy distributions peak in the mid infrared. In this talk, I will present a progress report on a Cycle 1 James Webb Space Telescope program to determine 1) several fundamental properties of the coolest brown dwarfs including bolometric luminosity, effective temperature, and composition and 2) the brown dwarf mass function. Specifically I will discuss what we have learned about the ~450 K brown dwarf WISE 0359-04 from its 1-22 micron spectral energy distribution. I will also briefly discuss the sample as a whole including how models seem to over predict the abundance of PH3 and under predict the abundance of CO2.

Date: Jeudi, le 1 février 2024
Heure: 12:30
Lieu: Université de Montréal