Models of Rotating Infall for the B335 Protostar

Abstract

Models of the protostellar source, B335, are developed using axisymmetric three-dimensional models to resolve conflicts found in one-dimensional models. The models are constrained by a large number of observations, including ALMA, Herschel, and Spitzer data. Observations of the protostellar source B335 with ALMA show red-shifted absorption against a central continuum source indicative of infall in the HCO${}^{+}$ and HCN $J=4\to 3$ transitions. The data are combined with a new estimate of the distance to provide strong constraints to three-dimensional radiative transfer models including a rotating, infalling envelope, outflow cavities, and a very small disk. The models favor ages since the initiation of collapse between $3\times 10^4$ and $4\times 10^4$ yr for both the continuum and the lines, resolving a conflict found in one-dimensional models. The models under-predict the continuum emission seen by ALMA, suggesting an additional component such as a pseudo-disk. The best-fitting model is used to convert variations in the 4.5 $\mu m$ flux in recent years into a model for a variation of a factor of 5-7 in luminosity over the last 8 years.

arXiv comment22 pages, 20 figures, in press ApJ

References in corpus (50)

• Astropy: A Community Python Package for Astronomy
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Gaia mission
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• Interpreting Spectral Energy Distributions from Young Stellar Objects. II. Fitting observed SEDs using a large grid of pre-computed models
• Interpreting Spectral Energy Distributions from Young Stellar Objects. I. A grid of 200,000 YSO model SEDs
• Initial Performance of the NEOWISE Reactivation Mission
• The c2d Spitzer Spectroscopic Survey of Ices Around Low-Mass Young Stellar Objects: I. H2O and the 5-8 um Bands
• Tracing the Mass during Low-Mass Star Formation. I. Submillimeter Continuum Observations
• LIME - a flexible, non-LTE line excitation and radiation transfer method for millimeter and far-infrared wavelengths
• HYPERION: An open-source parallelized three-dimensional dust continuum radiative transfer code
• Evolutionary Signatures in the Formation of Low-Mass Protostars. II. Towards Reconciling Models and Observations
• Tracing the Mass during Low-Mass Star Formation. III. Models of the Submillimeter Dust Continuum Emission from Class 0 Protostars
• The earliest phases of star formation - A Herschel key project. The thermal structure of low-mass molecular cloud cores
• Evolutionary Signatures in the Formation of Low-Mass Protostars
• Magnetically regulated collapse in the B335 protostar ? I. ALMA observations of the polarized dust emission
• Embedded Protostars in the Dust, Ice, and Gas In Time (DIGIT) Key Program: Continuum SEDs, and an Inventory of Characteristic Far-Infrared Lines from PACS Spectroscopy
• CORINOS I: JWST/MIRI Spectroscopy and Imaging of a Class 0 protostar IRAS 15398-3359
• Advanced optimal extraction for the Spitzer/IRS
• A search for ionized jets towards massive young stellar objects
• Discovery of a Hot Corino in the Bok Globule B335
• Observational Constraints on Submillimeter Dust Opacity
• Detection of Infall in the Protostar B335 with ALMA
• Observations of Infalling and Rotational Motions on a 1,000-AU Scale around 17 Class 0 and 0/I Protostars: Hints of Disk Growth and Magnetic Braking?
• No Keplerian Disk >10 AU around the Protostar B335: Magnetic Braking or Young Age?
• B335: A Laboratory for Astrochemistry in a Collapsing Cloud
• Spitzer Observations of Bok Globule B335: Isolated Star Formation Efficiency and Cloud Structure
• Effect of Grain Size on Differential Desorption of Volatile Species and on Non-ideal MHD Diffusivity
• Kinematics and Physical Conditions of the Innermost Envelope in B335
• Kinematics around the B335 protostar down to au scales
• ALMA observations of doubly deuterated water: Inheritance of water from the prestellar environment
• Unveiling the detailed density and velocity structures of the protostellar core B335
• Constraining the Infalling Envelope Models of Embedded Protostars: BHR 71 and its Hot Corino
• The CDF Archive: Herschel PACS and SPIRE Spectroscopic Data Pipeline and Products for Protostars and Young Stellar Objects
• CO in Protostars (COPS): $Herschel$-SPIRE Spectroscopy of Embedded Protostars
• Herbig-Haro flows in B335
• The Class 0 Protostar BHR71: Herschel Observations and Dust Continuum Models
• Observations of the Onset of Complex Organic Molecule Formation in Interstellar Ices
• Chemical Differentiation and Temperature Distribution on a Few au Scale around the Protostellar Source B335
• Dissecting the different components of the modest accretion bursts of the very young protostar HOPS 373
• Constraining the magnetic field properties of Bok globule B335 using SOFIA/HAWC+
• Constraint on ion-neutral drift velocity in the Class 0 protostar B335 from ALMA observations
• Accretion Burst Echoes as Probes of Protostellar Environments and Episodic Mass Assembly
• Transition from ordered pinched to warped magnetic field on a 100 au scale in the Class 0 protostar B335
• JCMT POL-2 and ALMA polarimetric observations of 6000-100 au scales in the protostar B335: linking magnetic field and gas kinematics in observations and MHD simulations
• Radiative Transfer of HCN: Interpreting observations of hyperfine anomalies
• Analysis and test of the central-blue-spot infall hallmark
• Constraining Spatial Densities of Early Ice Formation in Small Dense Molecular Cores from Extinction Maps
• Structured velocity field in the inner envelope of B335: ALMA observations of rare CO isotopologues

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• Early Planet Formation in Embedded Disks (eDisk). I. Overview of the Program and First Results
• Investigating Protostellar Accretion-Driven Outflows Across the Mass Spectrum: JWST NIRSpec IFU 3-5~$\mu$m Spectral Mapping of Five Young Protostars
• Hunt for complex cyanides in protostellar ices with JWST: Tentative detection of CH${}_3$CN and C${}_2$H${}_5$CN
• JWST observations of ${}^{13}$CO${}_2$ ice: Tracing the chemical environment and thermal history of ices in protostellar envelopes
• Evolution of Chemistry in the envelope of Hot Corinos (ECHOS). I. Extremely young sulphur chemistry in the isolated Class 0 object B335
• Episodic infall towards a compact disk in B335?
• Can Protostellar Outflows Set Stellar Masses?