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Early Planet Formation in Embedded Disks (eDisk) XXI: Limited role of streamers in mass supply to the disk in the Class 0 protostar IRAS 16544-1604
Miyu Kido, Hsi-Wei Yen, Jinshi Sai +17
Asymmetric and narrow infalling structures, often called streamers, have been observed in several Class 0/I protostars, which is not expected in the classical star formation pictur…
Discovery of Asymmetric Spike-like Structures of the 10 au Disk around the Very Low-luminosity Protostar Embedded in the Taurus Dense Core MC 27/L1521F with ALMA
Kazuki Tokuda, Naoto Harada, Mitsuki Omura +10
Recent Atacama Large Millimeter/submillimeter Array (ALMA) observations have revealed an increasing number of compact protostellar disks with radii of less than a few tens of astro…
A VLA View of the Flared, Asymmetric Disk Around the Class 0 Protostar L1527 IRS
Patrick D. Sheehan, John J. Tobin, Zhi-Yun Li +21
We present high resolution Karl G. Jansky Very Large Array (VLA) observations of the protostar L1527 IRS at 7 mm, 1.3 cm, and 2 cm wavelengths. We detect the edge-on dust disk at a…
Misaligned Twin Molecular Outflows From Class-0 Proto-stellar Binary System VLA 1623A Unveiled by ALMA
Chihomi Hara, Ryohei Kawabe, Fumitaka Nakamura +9
We present the results of ALMA observations toward the low-mass Class-0 binary system, VLA 1623Aab in the Ophiuchus molecular cloud in CO, CO, and CO(2--1) lin…
Disk structure around the Class I protostar L1489 IRS revealed by ALMA: a warped disk system
Jinshi Sai, Nagayoshi Ohashi, Kazuya Saigo +9
We have observed the Class I protostar L1489 IRS with the Atacama Millimeter/submillimeter Array (ALMA) in Band 6. The CO 2-1 line emission shows flattened and non-axisy…
Structure of a protobinary system: an asymmetric circumbinary disk and spiral arms
Tomoaki Matsumoto, Kazuya Saigo, Shigehisa Takakuwa
We investigate the gas structures around young binary stars by using three-dimensional numerical simulations. Each model exhibits circumstellar disks, spiral arms, and a circumbina…
Extremely Dense Cores associated with Chandra Sources in Ophiuchus A: Forming Brown Dwarfs Unveiled?
Ryohei Kawabe, Chihomi Hara, Fumitaka Nakamura +15
On the basis of various data such as ALMA, JVLA, Chandra, {\it Herschel}, and {\it Spitzer}, we confirmed that two protostellar candidates in Oph-A are bona fide protostars or prot…
ALMA Observations of SMM11 Reveal an Extremely Young Protostar in Serpens Main Cluster
Yusuke Aso, Nagayoshi Ohashi, Yuri Aikawa +8
We report the discovery of an extremely young protostar, SMM11, located in the associated submillimeter condensation SMM11 in the Serpens Main cluster using the Atacama Large Milli…
1000 AU Exterior Arcs Connected to the Protoplanetary Disk around HL Tau
Hsi-Wei Yen, Shigehisa Takakuwa, You-Hua Chu +13
The protoplanetary disk around HL Tau is so far the youngest candidate of planet formation, and it is still embedded in a protostellar envelope with a size of thousands of au. In t…
ALMA Observations of the Protostar L1527 IRS: Probing Details of the Disk and the Envelope Structures
Yusuke Aso, Nagayoshi Ohashi, Yuri Aikawa +7
We have newly observed the Class 0/I protostar L1527 IRS using the Atacama Large Millimeter/submillimeter Array (ALMA) during its Cycle 1 in 220 GHz dust continuum and C18O (J=2-1)…
Formation of the Unequal-Mass Binary Protostars in L1551 NE by Rotationally-Driven Fragmentation
Jeremy Lim, Tomoyuki Hanawa, Paul K. H. Yeung +3
We present observations at 7 mm that fully resolve the two circumstellar disks, and a reanalyses of archival observations at 3.5 cm that resolve along their major axes the two ioni…
Rotationally-Driven Fragmentation for the Formation of the Binary Protostellar System L1551 IRS 5
Jeremy Lim, Paul K. H. Yeung, Tomoyuki Hanawa +3
Either bulk rotation or local turbulence is widely invoked to drive fragmentation in collapsing cores so as to produce multiple star systems. Even when the two mechanisms predict d…
ALMA Observations of the Transition from Infall Motion to Keplerian Rotation around the Late-phase Protostar TMC-1A
Yusuke Aso, Nagayoshi Ohashi, Kazuya Saigo +9
We have observed the Class I protostar TMC-1A with Atacama Millimeter/submillimeter Array (ALMA) in 12CO and C18O (J=2-1), and 1.3-mm dust continuum emission. Continuum emission wi…
First Results from High Angular Resolution ALMA Observations Toward the HL Tau Region
ALMA Partnership, C. L. Brogan, L. M. Perez +82
We present Atacama Large Millimeter/submillimeter Array (ALMA) observations from the 2014 Long Baseline Campaign in dust continuum and spectral line emission from the HL Tau region…
Active-Region Tilt Angles: Magnetic Versus White-Light Determinations of Joy's Law
Y. -M. Wang, R. C. Colaninno, T. Baranyi +1
The axes of solar active regions are inclined relative to the east--west direction, with the tilt angle tending to increase with latitude ("Joy's law"). Observational determination…
Angular Momentum Exchange by Gravitational Torques and Infall in the Circumbinary Disk of the Protostellar System L1551 NE
Shigehisa Takakuwa, Masao Saito, Kazuya Saigo +4
We report the ALMA observation of the Class I binary protostellar system L1551 NE in the 0.9-mm continuum, C18O (3-2), and 13CO (3-2) lines at a ~1.6 times higher resolution and a…
ALMA Observations of Infalling Flows toward the Keplerian Disk around the Class I Protostar L1489 IRS
Hsi-Wei Yen, Shigehisa Takakuwa, Nagayoshi Ohashi +8
We have conducted ALMA observations in the 1.3 mm continuum and 12CO (2-1), C18O (2-1) and SO (5_6-4_5) lines toward L1489 IRS, a Class I protostar surrounded by a Keplerian disk a…
ALMA observations of a high-density core in Taurus: dynamical gas interaction at the possible site of a multiple star formation
Kazuki Tokuda, Toshikazu Onishi, Kazuya Saigo +7
Starless dense cores eventually collapse dynamically, which forms protostars inside them, and the physical properties of the cores determine the nature of the forming protostars. W…
Local Enhancement of Surface Density in the Protoplanetary Ring Surrounding HD 142527
Misato Fukagawa, Takashi Tsukagoshi, Munetake Momose +15
We report ALMA observations of dust continuum, 13CO J=3--2, and C18O J=3--2 line emission toward a gapped protoplanetary disk around HD 142527. The outer horseshoe-shaped disk show…
The Rotating Outflow, Envelope and Disk in Class-0/I protostar [BHB2007] 11 in the Pipe Nebula
C. Hara, Y. Shimajiri, T. Tsukagoshi +6
We present the results of observations toward a low-mass Class-0/I protostar, [BHB2007]#11 (afterwards B59#11) at the nearby (d=130 pc) star forming region, Barnard 59 (B59) in the…
Chemistry in the First Hydrostatic Core Stage By Adopting Three-Dimensional Radiation Hydrodynamic Simulations
Kenji Furuya, Yuri Aikawa, Kengo Tomida +5
We investigate molecular evolution from a molecular cloud core to a first hydrostatic core in three spatial dimensions. We perform a radiation hydrodynamic simulation in order to t…
Radiation Magnetohydrodynamic Simulations of Protostellar Collapse: Protostellar Core Formation
Kengo Tomida, Kohji Tomisaka, Tomoaki Matsumoto +4
We report the first three-dimensional radiation magnetohydrodynamic (RMHD) simulations of protostellar collapse with and without Ohmic dissipation.We take into account many physica…
Exposed Long-lifetime First-core: A New Model of First Cores Based on Radiation Hydrodynamics
Kengo Tomida, Masahiro N. Machida, Kazuya Saigo +2
A first adiabatic core is a transient object formed in the early phase of star formation. The observation of a first core is believed to be difficult because of its short lifetime…
Radiation Magnetohydrodynamics Simulation of Proto-Stellar Collapse: Two-Component Molecular Outflow
Kengo Tomida, Kohji Tomisaka, Tomoaki Matsumoto +3
We perform a three-dimensional nested-grid radiation magneto-hydrodynamics (RMHD) simulation with self-gravity to study the early phase of the low-mass star formation process from…