Ultra-cool brown dwarfs with and without circum-substellar plasma disks: possible consequencesстатья
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Аннотация:We analyze the literature data for two isolated Y-type brown dwarfs: CWISEP J193518.59-154620.3 (W1935 for short) and WISE J222055.31-362817.4 (W2220 for short)with close masses, similar radii, temperatures, solar luminosity ratios, and chemicalcompositions, however, the CH4 infrared emission was detected only from one of them(W1935), but not from the other (W2220). It was also found that W2220 does not havea temperature inversion with atmospheric altitude, whileW1935 does. We suggest thatthe possible reason for this is that the brown dwarf W1935 has its own magnetic fieldand a surrounding plasma current disk (or magnetodisk), while W2220 does not.