An unbiased ALMA spectral survey of the LkCa 15 and MWC 480 protoplanetary disks

Abstract

The volatile contents of protoplanetary disks both set the potential for planetary chemistry and provide valuable probes of defining disk system characteristics such as stellar mass, gas mass, ionization, and temperature structure. Current disk molecular inventories are fragmented, however, giving an incomplete picture: unbiased spectral line surveys are needed to assess the volatile content. We present here an overview of such a survey of the protoplanetary disks around the Herbig Ae star MWC 480 and the T Tauri star LkCa 15 in ALMA Band 7, spanning $\sim$36 GHz from 275--317 GHz and representing an order of magnitude increase in sensitivity over previous single-dish surveys. We detect 14 molecular species (including isotopologues), with 5 species (C${}^{34}$S, ${}^{13}$CS, H${}_2$CS, DNC, and C${}_2$D) detected for the first time in protoplanetary disks. Significant differences are observed in the molecular inventories of MWC~480 and LkCa~15, and we discuss how these results may be interpreted in light of the different physical conditions of these two disk systems.

20 pages, 11 figures

References in corpus (29)

• Complex Chemistry in Star-Forming Regions: An Expanded Gas-Grain Warm-up Chemical Model
• The ALMA Protostellar Interferometric Line Survey (PILS): First results from an unbiased submillimeter wavelength line survey of the Class 0 protostellar binary IRAS 16293-2422 with ALMA
• Discovery of the Interstellar Chiral Molecule Propylene Oxide (CH${}_3$CHCH${}_2$O)
• The cometary composition of a protoplanetary disk as revealed by complex cyanides
• Complex organic molecules in protoplanetary disks
• Constraining the X-ray and Cosmic Ray Ionization Chemistry of the TW Hya Protoplanetary Disk: Evidence for a Sub-interstellar Cosmic Ray Rate
• Direct mapping of the temperature and velocity gradients in discs. Imaging the vertical CO snow line around IM Lupi
• Lupus disks with faint CO isotopologues: low gas/dust or large carbon depletion?
• Hydrocarbon emission rings in protoplanetary disks induced by dust evolution
• The Coupled Physical Structure of Gas and Dust in the IM Lup Protoplanetary Disk
• Mass inventory of the giant-planet formation zone in a solar nebula analog
• Reprocessing of Ices in Turbulent Protoplanetary Disks: Carbon and Nitrogen Chemistry
• Detection of E-cyanomethanimine towards Sagittarius B2(N) in the Green Bank Telescope PRIMOS Survey
• Sulfur chemistry in protoplanetary disks: CS and H2CS
• Disk evolution, element abundances and cloud properties of young gas giant planets
• Robustness of N2H+ as tracer of the CO snowline
• A survey of C2H, HCN, and C18O in protoplanetary disks
• An ALMA survey of DCN/H${}^{13}$CN and DCO${}^{+}$/H${}^{13}$CO${}^{+}$ in protoplanetary disks
• The masses of young stars: CN as a probe of dynamical masses
• The Flying Saucer: Tomography of the thermal and density gas structure of an edge-on protoplanetary disk
• An ALMA Survey of H${}_2$CO in Protoplanetary Disks
• ALMA reveals the anatomy of the mm-sized dust and molecular gas in the HD 97048 disk
• Upper limits on CH${}_3$OH in the HD 163296 protoplanetary disk: evidence for a low gas-phase CH${}_3$OH/H${}_2$CO ratio
• A Surface Density Perturbation in the TW Hydrae Disk at 95 au Traced by Molecular Emission
• Nitrogen Fractionation in Protoplanetary Disks from the H13CN/HC15N Ratio
• Unbiased mm-wave Line Surveys of TW Hya and V4046 Sgr: The Enhanced C2H and CN Abundances of Evolved Protoplanetary Disks
• Increased H${}_2$CO production in the outer disk around HD 163296
• A Ring of C2H in the Molecular Disk Orbiting TW Hya
• An Unbiased 1.3 mm Emission Line Survey of the Protoplanetary Disk Orbiting LkCa 15

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