AB Aur, a Rosetta stone for studies of planet formation (II): H${}_2$S detection and sulfur budget

Abstract

The sulfur abundance is poorly known in most environments. Yet, deriving the sulfur abundance is key to understanding the evolution of the chemistry from molecular clouds to planetary atmospheres. We present observations of H${}_2$S 110-101 at 168.763 GHz toward the Herbig Ae star AB Aur. We aim to study the abundance of sulfuretted species toward AB Aur and to constrain how different species and phases contribute to the sulfur budget. We present new NOrthern Extended Millimeter Array (NOEMA) interferometric observations of the continuum and H${}_2$S 110-101 line at 168.763 GHz toward AB Aur. We derived radial and azimuthal profiles and used them to compare the geometrical distribution of different species in the disk. Assuming local thermodynamical equilibrium (LTE), we derived column density and abundance maps for H${}_2$S, and we further used Nautilus to produce a more detailed model of the chemical abundances at different heights over the mid-plane at a distance of r=200 au. We have resolved H${}_2$S emission in the AB Aur protoplanetary disk. The emission comes from a ring extending from 0.67 (109 au) to 1.69 (275 au). Under simple assumptions, we derived an abundance of (3.1$\pm$0.8)$\times$10${}^{-10}$ with respect to H nuclei, which we compare with Nautilus models to deepen our understanding of the sulfur chemistry in protoplanetary disks. Chemical models indicate that H$-2$S is an important sulfur carrier in the solid and gas phase. We also find an important transition at a height of 12 au, where the sulfur budget moves from being dominated by ice species to being dominated by gas species. Studying sulfuretted species in detail in the different phases of the interstellar medium is key to solving the issue.

arXiv comment11 pages, 14 figures, 4 tables

References in corpus (62)

• The chemical composition of the Sun
• A Unified Representation of Gas-Phase Element Depletions in the Interstellar Medium
• Non-thermal desorption from interstellar dust grains via exothermic surface reactions
• The 2014 KIDA network for interstellar chemistry
• Gas and grain chemical composition in cold cores as predicted by the Nautilus 3-phase model
• Polycylcic Aromatic Hydrocarbons (PAH's) in dense cloud chemistry
• Accretion Rates in Herbig Ae stars
• Binding energies: new values and impact on the efficiency of chemical desorption
• Chemistry in Disks. IV. Benchmarking gas-grain chemical models with surface reactions
• On the reservoir of sulphur in dark clouds : chemistry and elemental abundance reconciled
• Modeling Sulfur Depletion in Interstellar Clouds
• A line confusion limited millimeter survey of Orion KL (I): sulfur carbon chains
• Low sulfur depletion in the Horsehead PDR
• Oxygen depletion in dense molecular clouds: a clue to a low O2 abundance?
• Sulfur depletion in dense clouds and circumstellar regions I. H2S ice abundance and UV-photochemical reactions in the H2O-matrix
• Sub-arcsec imaging of the AB Aur molecular disk and envelope at millimeter wavelengths: a non Keplerian disk
• Sulphur chemistry in the L1544 pre-stellar core
• Herschel observations of EXtra-Ordinary Sources: Analysis of the HIFI 1.2 THz Wide Spectral Survey Toward Orion KL I. Methods
• Measuring Protoplanetary Disk Accretion with H I Pf-beta
• Gas phase Elemental abundances in Molecular cloudS (GEMS) I. The prototypical dark cloud TMC 1
• The circumstellar disk of AB Aurigae: evidence for envelope accretion at late stages of star formation?
• Planet Formation in AB Aurigae: Imaging of the inner gaseous Spirals observed inside the Dust Cavity
• Sulphur-bearing molecules in diffuse molecular clouds: new results from SOFIA/GREAT and the IRAM 30 m telescope
• Sulfur chemistry in protoplanetary disks: CS and H2CS
• Isotopic ratios of H, C, N, O, and S in comets C/2012 F6 (Lemmon) and C/2014 Q2 (Lovejoy)
• The Structure of the Evolved Circumbinary Disk around V4046 Sgr
• Sulphur-bearing species in the star forming region L1689N
• The gas-phase chemistry of carbon chains in dark cloud chemical models
• Chemistry in Protoplanetary Disks: the gas-phase CO/H2 ratio and the Carbon reservoir
• Chemistry in Disks VIII: the CS molecule as an analytic tracer of turbulence in disks
• Gas phase Elemental abundances in Molecular cloudS (GEMS). II. On the quest for the sulphur reservoir in molecular clouds: the $H_{2}S$ case
• Chemistry in Disks X: The Molecular Content of Proto-planetary Disks in Taurus
• CID: Chemistry in disks VI.sulfur-bearing molecules in the protoplanetary disks surrounding LkCa15, MWC480, DM Tau, and GO Tau
• First detection of interstellar S2H
• Interferometric imaging of the sulfur-bearing molecules H2S, SO and CS in comet C/1995 O1 (Hale-Bopp)
• Modelling the sulphur chemistry evolution in Orion KL
• Ionization fraction and the enhanced sulfur chemistry in Barnard 1
• A Method for Deriving Accurate Gas-Phase Abundances for the Multiphase Interstellar Galactic Halo
• Photoprocessing of H2S on dust grains: building S chains in translucent clouds and comets
• ALMA chemical survey of disk-outflow sources in Taurus (ALMA-DOT) II: Vertical stratification of CO, CS, CN, H${}_2$CO, and CH${}_3$OH in a Class I disk
• First detection of H${}_2$S in a protoplanetary disk. The dense GG Tau A ring
• Abundances of sulphur molecules in the Horsehead nebula. First NS+ detection in a photodissociation region
• APEX 1 mm line survey of the Orion Bar
• Polysulfanes on interstellar grains as a possible reservoir of interstellar sulphur
• Sulphur monoxide exposes a potential molecular disk wind from the planet-hosting disk around HD100546
• Gas phase Elemental abundances in Molecular cloudS (GEMS). IV. Observational results and statistical trends
• High spatial resolution imaging of SO and H2CO in AB Auriga: the first SO image in a transitional disk
• Bottlenecks to interstellar sulfur chemistry: Sulfur-bearing hydrides in UV-illuminated gas and grains
• An Ionized Outflow from AB Aur, a Herbig Ae Star with a Transitional Disk
• AB Aur, a Rosetta stone for studies of planet formation (I): chemical study of a planet-forming disk
• Chemical modeling of water deuteration in IRAS16293-2422
• Chemistry in Disks. II. -- Poor molecular content of the AB Aur disk
• The initial gas-phase sulfur abundance in the Orion Molecular Cloud from sulfur radio recombination lines
• Probing the cold dust emission in the AB Aur disk: a dust trap in a decaying vortex?
• A new study of the chemical structure of the Horsehead nebula: the influence of grain-surface chemistry
• Sulfur Abundances in the Orion Association B Stars
• High Spatial Resolution Observations of Molecular Lines towards the Protoplanetary Disk around TW Hya with ALMA
• Chemical composition of the circumstellar disk around AB Aurigae
• ALMA chemical survey of disk-outflow sources in Taurus (ALMA-DOT) III: The interplay between gas and dust in the protoplanetary disk of DG Tau
• H${}_2$S observations in young stellar disks in Taurus
• An unbiased NOEMA 2.6 to 4 mm survey of the GG Tau ring: First detection of CCS in a protoplanetary disk
• Gas accretion within the dust cavity in AB Aur

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