81 citations · 954 across the 39 of their papers we have counts for
12 papers · 1 filter
Chemical evolution of some selected complex organic molecules in low-mass star-forming regions
Bratati Bhat, Rumela Kar, Suman Kumar Mondal +6
The destiny of complex organic molecules (COMs) in star-forming regions is interlinked with various evolutionary phases. Therefore, identifying these species in diversified environ…
Protostellar collapse: regulation of the angular momentum and onset of an ionic precursor
Pierre Marchand, Kengo Tomida, Kei Tanaka +2
Through the magnetic braking and the launching of protostellar outflows, magnetic fields play a major role in the regulation of angular momentum in star formation, which directly i…
Salt, Hot Water, and Silicon Compounds Tracing Massive Twin Disks
Kei E. I. Tanaka, Yichen Zhang, Tomoya Hirota +9
We report results of 0.05"-resolution observations toward the O-type proto-binary system IRAS 16547-4247 with the Atacama Large Millimeter/submillimeter Array (ALMA). We present dy…
Discovery of a Photoionized Bipolar Outflow towards the Massive Protostar G45.47+0.05
Yichen Zhang, Kei E. I. Tanaka, Viviana Rosero +6
Massive protostars generate strong radiation feedback, which may help set the mass they achieve by the end of the accretion process. Studying such feedback is therefore crucial for…
Dynamics of a Massive Binary at Birth
Yichen Zhang, Jonathan C. Tan, Kei E. I. Tanaka +6
Almost all massive stars have bound stellar companions, existing in binaries or higher-order multiples. While binarity is theorized to be an essential feature of how massive stars…
Disk wind feedback from high-mass protostars
Jan E. Staff, Kei E. I. Tanaka, Jonathan C. Tan
We perform a sequence of 3D magnetohydrodynamic (MHD) simulations of the outflow-core interaction for a massive protostar forming via collapse of an initial cloud core of $60~{M_\o…
The Impact of Feedback in Massive Star Formation. II. Lower Star Formation Efficiency at Lower Metallicity
Kei E. I. Tanaka, Jonathan C. Tan, Yichen Zhang +1
We conduct a theoretical study of the formation of massive stars over a wide range of metallicities from 1e-5 to 1Zsun and evaluate the star formation efficiencies (SFEs) from pres…
Outflow-Confined HII regions. II. The Early Break-Out Phase
Kei E. I. Tanaka, Jonathan C. Tan, Jan E. Staff +1
In this series of papers, we model the formation and evolution of the photoionized region and its observational signatures during massive star formation. Here we focus on the early…
The Impact of Feedback During Massive Star Formation by Core Accretion
Kei E. I. Tanaka, Jonathan C. Tan, Yichen Zhang
We study feedback during massive star formation using semi-analytic methods, considering the effects of disk winds, radiation pressure, photoevaporation and stellar winds, while fo…
Outflow-Confined H II Regions. I. First Signposts of Massive Star Formation
Kei E. I. Tanaka, Jonathan C. Tan, Yichen Zhang
We present an evolutionary sequence of models of the photoionized disk-wind outflow around forming massive stars based on the Core Accretion model. The outflow is expected to be th…
Photoevaporation of Circumstellar Disks Revisited: The Dust-Free Case
Kei E. I. Tanaka, Taishi Nakamoto, Kazuyuki Omukai
Photoevaporation by stellar ionizing radiation is believed to play an important role in the dispersal of disks around young stars. The mass loss model for dust-free disks developed…
Direct diagnostics of forming massive stars: stellar pulsation and periodic variability of maser sources
Kohei Inayoshi, Koichiro Sugiyama, Takashi Hosokawa +2
The 6.7 GHz methanol maser emission, a tracer of forming massive stars, sometimes shows enigmatic periodic flux variations over several 10-100 days. In this Letter, we propose that…