Digging into the Interior of Hot Cores with ALMA

The DIHCA survey aims to address many key questions that require the high angular resolution that only ALMA can provide. The main goals are to determine how common accretion disks around high-mass stars are, how high-mass stars are fed, and what process dominates the formation of binary systems in high-mass star-forming regions. We use ALMA to observe dust continuum and molecular line emission from 30 high-mass star-forming regions in a range of evolutionary stages (same target list as MagMaR). Single-pointing observations in 2 ALMA configurations at ~220 GHz (1.33 mm) were used, providing an angular resolution of ~0.3" and 0.05" (∼1000 and ~150 au, respectively, at the average source distance).

Publications


  
DIHCA I. Dissecting the High-mass Star-forming Core G335.579-0.292 MM1                            
Olguin, Sanhueza et al. (2021)
 
DIHCA II. Exploring the Inner Binary (Multiple) System Embedded in G335 MM1 ALMA1
Olguin, Sanhueza et al. (2022)


 
DIHCA III. The Chemical Link between NH2CHO, HNCO, and H2CO
Taniguchi, Sanhueza et al. (2023)
 
Observations of high-order multiplicity in a high-mass stellar protocluster           
Li, Sanhueza et al. (2023)


 
Digging into the Interior of Hot Cores with ALMA: Spiral Accretion into the High-mass Protostellar Core G336.01-0.82
Olguin, Sanhueza et al. (2023)
 
DIHCA IV. Fragmentation in High-mass Star-forming Clumps           
Ishihara, Sanhueza et al. (2024)


 
Digging Into the Interior of Hot Cores with ALMA (DIHCA). V. Deuterium Fractionation of Methanol
Sakai et al. (2025)