Chemical Evolution in VeLLOs

Abstract

A new type of object called "Very Low Luminosity Objects (VeLLOs)" has been discovered by the Spitzer Space Telescope. VeLLOs might be substellar objects forming by accretion. However, some VeLLOs are associated with strong outflows, indicating the previous existence of massive accretion. The thermal history, which significantly affects the chemistry, between substellar objects with a continuous low accretion rate and objects in a quiescent phase after massive accretion (outburst) must be greatly different. In this study, the chemical evolution has been calculated in an episodic accretion model to show that CO and N2H+ have a relation different from starless cores or Class 0/I objects. Furthermore, the CO2 ice feature at 15.2 micron will be a good tracer of the thermal process in VeLLOs.

corrected e-mail address

References in corpus (10)

• The Origin of Episodic Accretion Bursts in the Early Stages of Star Formation
• Evolution of Chemistry and Molecular Line Profile during Protostellar Collapse
• A "Starless" Core that Isn't: Detection of a Source in the L1014 Dense Core with the Spitzer Space Telescope
• The Spitzer c2d Survey of Nearby Dense Cores: II: Discovery of a Low Luminosity Object in the "Evolved Starless Core" L1521F
• Evolutionary Signatures in the Formation of Low-Mass Protostars
• Spitzer Mid-infrared Spectroscopy of Ices Toward Extincted Background Stars
• The Spitzer c2d Survey of Nearby Dense Cores: I: First Direct Detection of the Embedded Source in IRAM 04191+1522
• Discovery of a Low Mass Bipolar Molecular Outflow from L1014-IRS with the Submillimeter Array
• Deep Near-Infrared Observations of L1014: Revealing the nature of the core and its embedded source
• Dynamical and chemical properties of the "starless" core L1014

Cited by in corpus (35)

• Astrochemistry During the Formation of Stars
• Variable protostellar accretion with episodic bursts
• Resolving the Luminosity Problem in Low-Mass Star Formation
• Evolutionary Signatures in the Formation of Low-Mass Protostars. II. Towards Reconciling Models and Observations
• Methanol and its relation to the water snowline in the disk around the young outbursting star V883 Ori
• Molecule sublimation as a tracer of protostellar accretion: Evidence for accretion bursts from high angular resolution C18O images
• On the reliability of protostellar disc mass measurements and the existence of fragmenting discs
• Chemical tracers of episodic accretion in low-mass protostars
• CO2 Ice toward Low-luminosity, Embedded Protostars: Evidence for Episodic Mass Accretion via Chemical History
• Chronology of Episodic Accretion in Protostars -- an ALMA survey of the CO and H${}_2$O snowlines
• Self-consistent evolution of accreting low-mass stars and brown dwarfs
• Resolved Depletion Zones and Spatial Differentiation of N2H+ and N2D+
• Fundamental aspects of episodic accretion chemistry explored with single-point models
• Chemical Signatures of the FU Ori Outbursts
• The chemistry of episodic accretion in embedded objects. 2D radiation thermo-chemical models of the post-burst phase
• Protostellar accretion traced with chemistry. High resolution C18O and continuum observations towards deeply embedded protostars in Perseus
• The effect of episodic accretion on the phase transition of CO and CO_2 in low-mass star formation
• The JCMT Transient Survey: Detection of sub-mm variability in a Class I protostar EC 53 in Serpens Main
• A search for pre-substellar cores and proto-brown dwarf candidates in Taurus: multiwavelength analysis in the B213-L1495 clouds
• Luminosity outburst chemistry in protoplanetary discs: going beyond standard tracers
• The Relationship between Mid-Infrared and Sub-Millimetre Variability of Deeply Embedded Protostars
• Knotty protostellar jets as a signature of episodic protostellar accretion?
• Evolution of dust in protoplanetary disks of eruptive stars
• The circumstellar environment around the embedded protostar EC 53
• Widening of Protostellar Outflows: an Infrared Outflow Survey in Low Luminosity Objects
• Dissecting the different components of the modest accretion bursts of the very young protostar HOPS 373
• Astro & cosmo-chemical consequences of accretion bursts I: the D/H ratio of water
• The effect of luminosity outbursts on the protoplanetary disk dynamics
• The accretion burst of the massive young stellar object G323.46 -0.08
• Modeling snowline locations in protostars: The impact of the structure of protostellar cloud cores
• Ice features of low-luminosity protostars in near-infrared spectra of AKARI/IRC
• The gas disk: Evolution and chemistry
• Radio Variability Survey of Very Low Luminosity Protostars
• Evidence of Accretion Burst: The Viscously Heated Inner Disk of the Embedded Protostar IRAS 16316-1540
• Ancillary science with Ariel: Feasibility and scientific potential of young stellar object observations