An Asymmetric Keplerian Disk Surrounding the O-type Protostar IRAS16547$-$4247

Abstract

During the last decades, a great interest has emerged to know if even the most massive stars in our galaxy (namely the spectral O-type stars) are formed in a similar manner as the low- and intermediate-mass stars, that is, through the presence of accreting disks and powerful outflows. Here, using sensitive observations of the Atacama Large Millimeter/Submillimeter Array (ALMA), we report a resolved Keplerian disk (with fifteen synthesized beams across its major axis) surrounding the deeply embedded O-type protostar IRAS16547$-$4247. The disk shows some asymmetries that could arise because of the disk is unstable and fragmenting or maybe because of different excitation conditions within the disk. The enclosed mass estimated from the disk Keplerian radial velocities is 25$\pm$3 M${}_{\odot }$. The molecular disk is at the base of an ionized thermal radio jet and is approximately perpendicular to the jet axis orientation. We additionally find the existence of a binary system of compact dusty objects at the center of the accreting disk, which indicates the possible formation of an O-type star and a companion of lower mass. This is not surprising due to the high binary fraction reported in massive stars. Subtracting the contribution of the dusty disk plus the envelope and the companion, we estimated a mass of 20 M${}_{\odot }$ for the central star.

Accepted by The Astrophysical Journal

References in corpus (10)

• On the diversity and statistical properties of protostellar discs
• Fragmentation of Massive Protostellar Disks
• G11.92-0.61 MM1: A Keplerian disc around a massive young proto-O star
• The ALMA View of the OMC1 Explosion in Orion
• A necklace of dense cores in the high-mass star forming region G35.20-0.74N: ALMA observations
• The Collimated Jet Source in IRAS 16547-4247: Time Variation, Possible Precession, and Upper Limits to the Proper Motions Along the Jet Axis
• ALMA reveals a candidate hot and compact disk around the O-type protostar IRAS 16547$-$4247
• Strongly misaligned triple system in SR 24 revealed by ALMA
• The Rotating Molecular Structures and the Ionized Outflow Associated with IRAS 16547-4247
• IRAS16547-4247: A New Candidate of a Protocluster Unveiled with ALMA

Cited by in corpus (25)

• Unifying low and high mass star formation through density amplified hubs of filaments
• Substructures in the Keplerian disc around the O-type (proto)star G17.64+0.16
• Formation and Evolution of Disks around Young Stellar Objects
• Zooming in on Individual Star Formation: Low- and High-mass Stars
• Magnetic Fields in Massive Star-Forming Regions (MagMaR) I. Linear Polarized Imaging of the UCHII Region G5.89-0.39
• Salt, Hot Water, and Silicon Compounds Tracing Massive Twin Disks
• ALMA View of the Infalling Envelope around a Massive Protostar in S255IR SMA1
• Disk Kinematics and Stability in High-Mass Star Formation: Linking Simulations and Observations
• Modeling the accretion disk around the high-mass protostar GGD 27-MM1
• The Physical Properties of the SVS 13 Protobinary System: Two Circumstellar Disks and a Spiraling Circumbinary Disk in the Making
• The SEDIGISM survey: a search for molecular outflows
• A massive Keplerian protostellar disk with flyby-induced spirals in the Central Molecular Zone
• Kinematics and stability of high-mass protostellar disk candidates at sub-arcsecond resolution -- Insights from the IRAM NOEMA large program CORE
• ALMA observations of the Extended Green Object G19.01$-$0.03: I. A Keplerian disc in a massive protostellar system
• A Detailed View of the Circumstellar Environment and Disk of the Forming O-star AFGL 4176
• A photoionized accretion disk around a young high-mass star
• Discovery of a 500 au Protobinary in the Massive Prestellar Core G11.92-0.61 MM2
• The disk-outflow system around the rare young O-type protostar W42-MME
• The onset of stellar multiplicity in massive star formation: A search for low-mass companions of massive young stellar objects with $L^{\prime }$-band adaptive optics imaging
• Digging into the Interior of Hot Cores with ALMA (DIHCA). VII. Disk candidates around high-mass stars and evidence of anisotropic infall
• First spatially resolved Na I and He I transitions towards an MYSO. Finding new tracers for the gaseous star/disc interface
• ngVLA Synthetic Observations of Ionized Gas in Massive Protostars
• A New Catalog of Asymptotic Giant Branch Stars in Our Galaxy
• Properties of Contracting Massive Protostellar Cores
• An Eccentric Massive Protobinary Assembled via a Core-merger Parabolic Encounter