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Research Gallery > Star Formation Studies

Research Gallery

Star Formation Studies

An extremely young protostar, SMM11, observed in millimeter wavelength An extremely young protostar, SMM11, observed in millimeter wavelength
An extremely young protostar, SMM11, in the Serpens Main cluster forming region observed with ALMA in 1.3 mm continuum, 12CO J=2-1 line, and C18O J=2-1 line. These results, as well ...(more)
Visibility distribution of the protostar L1527 IRS in 220 GHz continuum Visibility distribution of the protostar L1527 IRS in 220 GHz continuum
Visibility distribution of the protostar L1527 IRS observed with ALMA in 220 GHz continuum. Visibility distributions are the Fourier transform of images. The amplitude distribution of this protostar is narrower ...(more)
How a supernova affects a nearby star-forming galaxy? How a supernova affects a nearby star-forming galaxy?
The image shows the turbulent gas when a supernova collides with a nearby star-forming galaxy. ...(more)
Is FS Tau B Driving an Asymmetric Jet? Is FS Tau B Driving an Asymmetric Jet?
Left: near infrared [Fe II] 1.644 µm + continuum image of the wide binary FS Tau A and B. FS Tau B is not visible but its adjacent reflection nebula ...(more)
Velocity-Resolved [Ne III] from X-ray Irradiated Sz 102 Microjets Velocity-Resolved [Ne III] from X-ray Irradiated Sz 102 Microjets
(a) Position–velocity (PV) diagram of the [Ne III] λ3869 line from Sz 102, after Gaussian decomposition. The emission corresponds to the blueshifted and redshifted microjets is shown in blue and ...(more)
ALMA Observation of Gas Spirals as a Nursery of Binary Stars ALMA Observation of Gas Spirals as a Nursery of Binary Stars
0.9-mm dust-continuum image of the protostellar binary L1551 NE observed with ALMA (left), and that predicted from our supercomputer numerical simulation (right). Green curves in the left panel traces the ...(more)
Dust distribution in the binary protostellar system L1551 NE observed with the SMA in 0.9 mm continuum. Dust distribution in the binary protostellar system L1551 NE observed with the SMA in 0.9 mm continuum.
Dust distribution in the binary protostellar system L1551 NE observed with the SMA in 0.9 mm continuum. Crosses show the position of each binary component. Dashed curves delineate the ring-like ...(more)
Infalling Flow toward a Keplerian Disk around the Protostar L1489 IRS Infalling Flow toward a Keplerian Disk around the Protostar L1489 IRS
(a) Schematic figure of our kinematic model. Red and blue arrows denote the directions of the outflow from the protostar. This protostar is surrounded by a Keplerian disk, and there ...(more)
Infalling and Rotational Motions of Ambient Gas around 17 Protostars Infalling and Rotational Motions of Ambient Gas around 17 Protostars
SMA images of the C18O (2-1) emission in the 17 Class 0 and 0/I protostellar sources. Contours show the intensity distribution of the C18O (2-1) emission, tracing the distribution of ...(more)
A still-forming protostar which is accreting material from a surrounding disk A still-forming protostar which is accreting material from a surrounding disk
This artist's concept shows a still-forming protostar which is accreting material from a surrounding disk. Some of the material from the disk, rather than falling onto the star, is ejected ...(more)
Two submm sources in the B1-b molecular cloud core. Two submm sources in the B1-b molecular cloud core.
Two submm sources in the B1-b molecular cloud core. (Left) Thermal dust emission at 1.1 mm observed with the SMA (white contours) on top of the mid-IR image taken with ...(more)
Youngest Protoplanetary Disk Discovered with ALMA Youngest Protoplanetary Disk Discovered with ALMA
ALMA observations by a team of astronomers led by Nadia Murillo and Shih-Ping Lai have found the youngest disk around a protostar to date, at an earlier stage than predicted ...(more)
A rotating disk (from the SMA observations) is detected around a protostar launching a powerful jet in Orion A rotating disk (from the SMA observations) is detected around a protostar launching a powerful jet in Orion
A rotating disk (from the SMA observations) is detected around a protostar launching a powerful jet (from the HST observations of Reipurth et al 1999) in Orion. (Lee 2011, ApJ, ...(more)
First detection of HC3N in protoplanetary disks First detection of HC3N in protoplanetary disks
The cyanoacetylene (HC3N) is a precursor of the organic molecules. It was observed for the first time in three protoplanetary disks thanks to IRAM 30m and PdBI observations. HC3N is ...(more)
a layer of dust almost transparent in the near infrared sitting above the protoplanetary disk around RY Tau star a layer of dust almost transparent in the near infrared sitting above the protoplanetary disk around RY Tau star
(Left) An image in the near infrared (1.65 μm) around RY Tau, observed using the HiCIAO coronagraph of Subaru Telescope. This type of observation is preferred for faint emissions associated ...(more)
Dust distribution around the Galactic center Dust distribution around the Galactic center
Dust distribution around the Galactic center, as observed in 0.86 mm continuum with the SMA. ...(more)
A New Method for Magnetic Field Strength Maps for Molecular Clouds A New Method for Magnetic Field Strength Maps for Molecular Clouds
Left Figure: SMA dust continuum observation at 345 GHz of the star-forming core W51 e2 with a resolution of about 0.7 arcsec. The color-wedge indicates the dust emission intensity. The ...(more)
Spatially Resolving Substructures within the Massive Protostellar Envelope in Orion Spatially Resolving Substructures within the Massive Protostellar Envelope in Orion
Left: 850 micron continuum image obtained with SMA. Right: Visibility-amplitude plot overlaid with modeled prestellar and protostellar cores. ...(more)
Mapping the Magnetic Field Strength in Molecular Clouds: W51 e2 Mapping the Magnetic Field Strength in Molecular Clouds: W51 e2
Magnetic field strength map for the collapsing core W51 e2, calculated with the polarization-intensity gradient method (Koch, Tang and Ho, 2012, ApJ 747(1), 79, 2012-03). ...(more)
Morphology of magnetic field in high mass star formation region - W51 e2 and e8 cores Morphology of magnetic field in high mass star formation region - W51 e2 and e8 cores
Magnetic (B)-field maps of massive starformation region W51 e2/e8 from the SMA (red segments) at 870 μm and BIMA (blue segments) at 1.3 mm. ...(more)
A Detailed Study of Spitzer-IRAC Emission in Herbig-Haro Objects. II. Interaction between Ejecta and Ambient Gas A Detailed Study of Spitzer-IRAC Emission in Herbig-Haro Objects. II. Interaction between Ejecta and Ambient Gas
top: Distribution of molecular hydrogen emission in the L 1157 jet. Blue, green, and red colors show emissions at 3.6, 4.5, and 8.0μm observed with the Spitzer Space Telescope. The ...(more)
The Extremely High-Velocity Outflow from the Luminous Young Stellar Object G5.89-0.39 The Extremely High-Velocity Outflow from the Luminous Young Stellar Object G5.89-0.39
Left: Extremely high-velocity molecular outflows of G5.89-0.39 in CO (2-1) imaged with the SMA. Right: The outflowing gas temperature versus the gas velocity deduced from the LVG calculations. An increasing ...(more)
Deuterium Fractionation as an Evolutionary Probe in Massive Protostellar/Cluster Cores Deuterium Fractionation as an Evolutionary Probe in Massive Protostellar/Cluster Cores
Deuterium fractionation, D_frac, vs. gas temperature (panel a), fitted line width (panel b), and CO depletion factor (panel c) in a number samples of massive star forming regions. ...(more)
The 7 mm Continuum Image of the Binary Protostellar System L1551 IRS 5 The 7 mm Continuum Image of the Binary Protostellar System L1551 IRS 5
The 7 mm continuum image of the binary protostellar system L1551 IRS 5 obtained with the VLA (Lim and Takakuwa 2006, ApJ, 653, 425). ...(more)
Carbon-chain and Organic Molecules around Very Low Luminosity Protostellar Objects of L1521F-IRS and IRAM 04191+1522 Carbon-chain and Organic Molecules around Very Low Luminosity Protostellar Objects of L1521F-IRS and IRAM 04191+1522
Molecular-line spectra toward L1521F (left) and IRAM 04191+1522 (right). Spectra from molecules such as C3H2, CH3CCH, and C4H, so-called "carbon-chain" molecules, are more intense in L1521F than in IRAM 04191+1522. ...(more)
Rotating Gas Motion around Protostars Rotating Gas Motion around Protostars
Morphology (contour) and kinematics (color scale) of envelopes around a sample of Class 0 and I protostars seen in the C18O (2-1) emission observed with the SMA. The color scale ...(more)
Extreme Active Molecular Jets in L1448C Extreme Active Molecular Jets in L1448C
Distributions of the high velocity SiO (left panel) and CO (right) emission. The velocity ranges are ±51–70km s with respect to the systemic velocity. Green cross in each panel denotes ...(more)
Numerical simulation of a planet interacting with a protoplanetary disk Numerical simulation of a planet interacting with a protoplanetary disk
Numerical simulation of a planet interacting with a protoplanetary disk (Zhang, Yuan and Yen, in preparation). ...(more)
The Discovery of the Youngest Molecular Outflow Associated with an Intermediate-mass Protostellar Core in Orion The Discovery of the Youngest Molecular Outflow Associated with an Intermediate-mass Protostellar Core in Orion
MMS 6-main, an extremely young intermediate-mass protostellar core, located in the Orion Molecular Cloud 3 region (OMC-3) ...(more)
Explosive disintegration of a massive young stellar system in Orion Explosive disintegration of a massive young stellar system in Orion
Artist's conception of molecular outflow from a massive young stellar system in Orion ...(more)
Snapshots of density structures Snapshots of density structures
Snapshots of density structures at 100 (top) and 1000 (bottom) years, respectively, for different anisotropy in the ambient mass distribution induced by magnetic field (Shang et al. 2006, ApJ, 649, ...(more)
Brown dwarf ISO-Oph 102 Brown dwarf ISO-Oph 102
An Artist's conception of the brown dwarf ISO-Oph 102 ...(more)
ASIAAa and ASIAAb ASIAAa and ASIAAb
A wide low-mass binary was discovered in the Galactic plane (Phan-Bao et al, 2008, MNRAS, 383, 831). The primary is an M0 star and the secondary is an L0 dwarf, ...(more)
The HH212 molecular jet The HH212 molecular jet
The HH212 molecular jet imaged with the SMA superposed on the H2 image (blue) adopted from McCaughrean et al. (2002). Left: C18O in red and 13CO in green. Right: SO ...(more)
The HH211 outflow The HH211 outflow
The HH211 outflow. Left: The H2 emission observed with the Very Large Telescope. Right: The approaching and receding SiO emission (blue and red contours, respectively) observed with the SMA superposed ...(more)
A schematic drawing of the X-wind model A schematic drawing of the X-wind model
A schematic drawing of the X-wind model. ...(more)
Protoplanetary disk around AB Aurigae Protoplanetary disk around AB Aurigae
Protoplanetary disk around AB Aurigae. Left: A comparison between the 0.85 mm dust continuum emission (color) and the CO(3-2) emission (contours) from the disk. Right: The CO(3-2) emission shown in ...(more)
CO(3-2) molecular outflow from the high-mass young star IRAS 20126+4104 CO(3-2) molecular outflow from the high-mass young star IRAS 20126+4104
Top left: SMA image of the CO(3-2) molecular outflow from the high-mass young star IRAS 20126+4104. Top right: The velocity-channel map of the H2CO emission that arises from the dense ...(more)
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