Disappearance of N2H+ from the Gas Phase in the Class 0 Protostar IRAM 04191

Abstract

We present a high-resolution millimeter study of the very young Class 0 protostar IRAM 04191+1522 in the Taurus molecular cloud. N2H+(1-0) observations with the IRAM Plateau de Bure Interferometer and 30m telescope demonstrate that the molecular ion N2H+ disappears from the gas phase in the inner part of the protostellar envelope (r < 1600 AU, n(H2) > 5 x 10^5 cm^-3). This result departs from the predictions of current chemical models. It suggests either that N2 is more depleted than the models predict, owing to a higher binding energy on polar ice or an enhanced grain chemistry transforming N2 to less volatile species, or that strong deuterium fractionation enhances N2D+ to the detriment of N2H+.

arXiv comment4 pages, 4 figures. Accepted for publication in Astronomy & Astrophysics Letters

References in corpus (9)

• Systematic Molecular Differentiation in Starless Cores
• N2H+ and C18O Depletion in a Cold Dark Cloud
• Molecular Evolution in Collapsing Prestellar Cores
• Abundant H2D+ in the pre-stellar core L1544
• CO Depletion and Deuterium Fractionation in Prestellar Cores
• The Degree of CO Depletion in Pre-stellar Cores
• Molecular line study of the very young protostar IRAM 04191 in Taurus: Infall, rotation, and outflow
• Molecular Evolution in Collapsing Prestellar Cores II: The Effect of Grain-surface Reactions
• Models for Dense Molecular Cloud Cores

Cited by in corpus (56)

• Probing the evolutionary status of starless cores through N2H+ and N2D+ observations
• Magnetic Braking and Protostellar Disk Formation: The Ideal MHD Limit
• Molecular Evolution in Collapsing Prestellar Cores III: Contraction of A Bonnor-Ebert Sphere
• Desorption rates and sticking coefficients for CO and N2 interstellar ices
• The importance of the ortho:para H2 ratio for the deuteration of molecules during pre-protostellar collapse
• Probing the formation of intermediate- to high-mass stars in protoclusters: A detailed millimeter study of the NGC 2264 clumps
• Characterizing young protostellar disks with the CALYPSO IRAM-PdBI survey: large Class 0 disks are rare
• SMA Observations of Class 0 Protostars: A High-Angular Resolution Survey of Protostellar Binary Systems
• Survey of ortho-H2D+(1_{1,0}-1_{1,1}) in dense cloud cores
• Molecular Outflows Driven by Low-Mass Protostars. I. Correcting for Underestimates When Measuring Outflow Masses and Dynamical Properties
• Complex Structure in Class 0 Protostellar Envelopes II: Kinematic Structure from Single-Dish and Interferometric Molecular Line Mapping
• The Spitzer c2d Survey of Nearby Dense Cores: I: First Direct Detection of the Embedded Source in IRAM 04191+1522
• Complex Structure in Class 0 Protostellar Envelopes III: Velocity Gradients in Non-Axisymmetric Envelopes, Infall or Rotation?
• The Excitation of N${}_2$H${}^{+}$ in Interstellar Molecular Clouds. I - Models
• The abundances of nitrogen-containing molecules during pre-protostellar collapse
• Interferometric Identification of a Pre-Brown Dwarf
• Quiescent Dense Gas in Protostellar Clusters: the Ophiuchus A Core
• Freeze-out and coagulation in pre-protostellar collapse
• Chronology of Episodic Accretion in Protostars -- an ALMA survey of the CO and H${}_2$O snowlines
• Effect of Grain Size on Differential Desorption of Volatile Species and on Non-ideal MHD Diffusivity
• Resolved Depletion Zones and Spatial Differentiation of N2H+ and N2D+
• Angular momentum profiles of Class 0 protostellar envelopes
• IRAM-PdBI Observations of Binary Protostars I: The Hierarchical System SVS13 in NGC1333
• Chemical Evolution in VeLLOs
• TMC-1C: an accreting starless core
• Line profiles of molecular ions toward the pre-stellar core LDN 1544
• The Initial Conditions of Clustered Star Formation. II. N2H+ Observations of the Ophiuchus B Core
• Dynamical and chemical properties of the "starless" core L1014
• N2H+ depletion in the massive protostellar cluster AFGL 5142
• ATCA and Spitzer Observations of the Binary Protostellar Systems CG30 and BHR71
• Probing the Protostellar Envelope around L1157: the Dust and Gas Connection
• Probing the CO and methanol snow lines in young protostars. Results from the CALYPSO IRAM-PdBI survey
• CN in prestellar cores
• Observation of rotation in star forming regions: clouds, cores, disks, and jets
• On The Gas Temperature of Molecular Cloud Cores
• The depletion of NO in pre-protostellar cores
• Three intermediate-mass YSOs with different properties emerging from the same natal cloud in IRAS 00117+6412
• Strongly induced collapse in the Class 0 protostar NGC 1333 IRAS 4A
• The Initial Conditions for Gravitational Collapse of a Core: An Extremely Young Low-Mass Class 0 Protostar GF9-2
• Probing Episodic Accretion in Very Low Luminosity Objects
• Magnetic field structure around cores with very low luminosity objects
• ATLASGAL --- Molecular fingerprints of a sample of massive star forming clumps
• The dynamical state of the First Hydrostatic Core Candidate Cha-MMS1
• The rotating molecular core and precessing outflow of the young stellar object Barnard 1c
• Prestellar and protostellar cores in Ori B9
• IRAS 16253-2429: the First Proto-Brown Dwarf Binary Candidate Identified through Dynamics of Jets
• Discovery of A Binary System in IRAM 04191+1522
• A Search for O_2 in CO-depleted Molecular Cloud Cores with Herschel
• Protostellar disk formation by a non-rotating, non-axisymmetric collapsing cloud: model and comparison with observations
• On estimating angular momenta of infalling protostellar cores from observations
• Terahertz spectroscopy and global analysis of the rotational spectrum of doubly deuterated Amidogen radical ND${}_2$
• A correlation between chemistry, polarization and dust properties in the Pipe Nebula starless core FeSt 1-457
• A survey of molecular cores in M17 SWex
• Carbon-Chain and Organic Molecules around Very Low-Luminosity Protostellar Objects of L1521F-IRS and IRAM 04191+1522
• Protonated hydrogen cyanide as a tracer of pristine molecular gas
• Probing episodic accretion with chemistry: CALYPSO observations of IRAM 04191+1522. Results from the CALYPSO IRAM-PdBI survey