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Magnetic Field Structure of Orion Source I
Tomoya Hirota, Richard L. Plambeck, Melvyn C. H. Wright +6
We observed polarization of the SiO rotational transitions from Orion Source I (SrcI) to probe the magnetic field in bipolar outflows from this high mass protostar. Both 43 GHz …
Disk-Driven Rotating Bipolar Outflow in Orion Source I
Tomoya Hirota, Masahiro N. Machida, Yuko Matsushita +5
One of the outstanding problems in star-formation theory concerns the transfer of angular momentum such that mass can accrete onto a newly born young stellar object (YSO). From a t…
ALMA Observation of the 658 GHz Vibrationally Excited HO Maser in Orion KL Source I
Tomoya Hirota, Mi Kyoung Kim, Mareki Honma
We present an observational study of the vibrationally excited HO line at 658 GHz (=1, 1-1) toward Orion KL using the Atacama Large Millimeter/Submil…
ALMA Imaging of Millimeter/Submillimeter Continuum Emission in Orion KL
Tomoya Hirota, Mi Kyoung Kim, Yasutaka Kurono +1
We have carried out high resolution observations with Atacama Large Millimeter/Submillimeter Array (ALMA) of continuum emission from Orion KL region. We identify 11 compact sources…
VERA and ALMA Observations of the H2O Supermaser Burst in Orion KL
Tomoya Hirota, Masato Tsuboi, Yasutaka Kurono +5
The 22 GHz H2O maser in Orion KL has shown extraordinary burst events in 1979-1985 and 1998-1999, sometimes called supermaser. We have conducted monitoring observations of the supe…
Hot Molecular Circumstellar Disk around Massive Protostar Orion Source I
Tomoya Hirota, Mi Kyoung Kim, Yasutaka Kurono +1
We report new Atacama Large Millimeter/Submillimeter Array (ALMA) observations of a circumstellar disk around Source I in Orion KL, an archetype of massive protostar candidate. We…
Accurate Parallax Measurement toward the Symbiotic Star R Aquarii
Cheulhong Min, Naoko Matsumoto, Mi Kyoung Kim +5
Multi-epoch phase-referencing VLBI (Very Long Baseline Interferometry) observations with VERA (VLBI Exploration of Radio Astrometry) were performed for the symbiotic star R Aquarii…
The first detection of the 232 GHz vibrationally excited H2O maser in Orion KL with ALMA
Tomoya Hirota, Mi Kyoung Kim, Mareki Honma
We investigated the ALMA science verification data of Orion KL and found a spectral signature of the vibrationally excited H2O maser line at 232.68670 GHz (nu2=1, 5,5,0-6,4,3). Thi…
Identification of Bursting Water Maser Features in Orion KL
Tomoya Hirota, Masato Tsuboi, Kenta Fujisawa +10
In February 2011, a burst event of the HO maser in Orion KL (Kleinmann-Low object) has started after 13-year silence. This is the third time to detect such phenomena in Orion…