Gone

COMPOSITION OF THE HD 169142 DISK AND IT’S EMBEDDED PLANET Luke Keyte - Queen Mary University of London - [email protected] ALMA 𝜆 = 1.3mm inner ring r~25 au outer rings r~60 au SPHERE NIR IMAGING Hammond et al. (2023) ALMA ARCHIVAL DATA Booth et al. (2023) SiS J=19-18 ALMA ARCHIVAL DATA Law et al. (2023) planet? CHEMICAL MODEL DALI MODELLING DENSITY AND TEMPERATURE STRUCTURE DALI MODELLING DENSITY AND TEMPERATURE STRUCTURE RESULTS Is it a CPD? 𝐼𝜈= 𝐵𝜈(𝑇) SiS emission intensity Ω = 𝐹 𝐵𝜈𝑇 Δ𝑣 SiS emitting area Temperature (K) Emitting radius (AU) 1. Measure the SiS Emitting Area Is it a CPD? r (au) ሶ 𝑀 ~ 10−4 𝑀⊙ yr−1 2. Match measured area to analytical CPD models Is it a CPD? no HD 169142 has a rich chemical inventory SUMMARY Carbon and oxygen are in high abundance in the gas phase - little/no depletion in the inner disk - oxygen somewhat depleted in the outer disk (?) Sulfur depleted by factor ~1000 - model dramatically underpredicts SiS emission SiS likely traces an outflow or shock, not a CPD 1 2 3 4