Lupus disks with faint CO isotopologues: low gas/dust or high carbon depletion?

  title={Lupus disks with faint CO isotopologues: low gas/dust or high carbon depletion?},
  author={Anna Miotello and E. F. van Dishoeck and Jonathan P. Williams and Megan Ansdell and Greta Guidi and Michiel R. Hogerheijde and Carlo Felice Manara and Marco Tazzari and Leonardo Testi and Nienke van der Marel and Sierk E. van Terwisga},
  journal={Astronomy and Astrophysics},
Context. An era has started in which gas and dust can be observed independently in protoplanetary disks, thanks to the recent surveys with the Atacama Large Millimeter/sub-millimeter Array (ALMA). The first near-complete high-resolution disk survey in both dust and gas in a single star-forming region has been carried out in Lupus, finding surprisingly low gas-to-dust ratios (Ansdell et al. 2016). Aims. The goal of this work is to fully exploit CO isotopologues observations in Lupus, comparing… 
The ALMA Lupus protoplanetary disk survey: evidence for compact gas disks and molecular rings from CN
Context. The cyanide radical CN is abundant in protoplanetary disks, with line fluxes often comparable to those of 13CO. It is known to be sensitive to UV irradiation of the upper disk atmosphere,
Bright C2H emission in protoplanetary discs in Lupus: high volatile C/O > 1 ratios
Context. Recent ALMA surveys in different star-forming regions have shown that CO emission in protoplanetary discs is much fainter than expected. Accordingly, CO-based gas masses and gas to dust
ALMA Survey of Lupus Protoplanetary Disks II: Gas Disk Radii
We present Atacama Large Millimeter/Sub-Millimeter Array (ALMA) Band 6 observations of a complete sample of protoplanetary disks in the young (~1–3 Myr) Lupus star-forming region, covering the 1.33
ALMA Survey of Lupus Protoplanetary Disks II: Gas Disk Radii
We present ALMA Band 6 observations of a complete sample of protoplanetary disks in the young (1-3 Myr) Lupus star-forming region, covering the 1.33 mm continuum and the 12CO, 13CO, and C18O J=2-1
A dust and gas cavity in the disc around CQ Tau revealed by ALMA
The combination of high-resolution and sensitivity offered by ALMA is revolutionizing our understanding of protoplanetary discs, as their bulk gas and dust distributions can be studied independently.
CO destruction in protoplanetary disk midplanes: Inside versus outside the CO snow surface
Context. The total gas mass is one of the most fundamental properties of disks around young stars, because it controls their evolution and their potential to form planets. To measure disk gas masses,
Systematic Variations of CO Gas Abundance with Radius in Gas-rich Protoplanetary Disks
CO is the most widely used gas tracer of protoplanetary disks. Its abundance is usually assumed to be an interstellar ratio throughout the warm molecular layer of the disk. But recent observations of
Molecules with ALMA at Planet-forming Scales (MAPS). V. CO Gas Distributions
  • Ke Zhang, A. Booth, +32 authors K. Furuya
  • Physics
    The Astrophysical Journal Supplement Series
  • 2021
Here we present high-resolution (15–24 au) observations of CO isotopologue lines from the Molecules with ALMA on Planet-forming Scales (MAPS) ALMA Large Program. Our analysis employs observations of
Disk masses around solar-mass stars are underestimated by CO observations
Gas in protostellar disks provides the raw material for giant planet formation and controls the dynamics of the planetesimal-building dust grains. Accurate gas mass measurements help map the observed
Unlocking CO Depletion in Protoplanetary Disks I. The Warm Molecular Layer
CO is commonly used as a tracer of the total gas mass in both the interstellar medium and in protoplanetary disks. Recently there has been much debate about the utility of CO as a mass tracer in


ALMA Survey of Lupus Protoplanetary Disks. I. Dust and Gas Masses
We present the first high-resolution sub-millimeter survey of both dust and gas for a large population of protoplanetary disks. Characterizing fundamental properties of protoplanetary disks on a
Determining protoplanetary disk gas masses from CO isotopologues line observations
Context. Despite intensive studies of protoplanetary disks, there is still no reliable way to determine their total (gast+dust) mass and their surface density distribution, quantities that are
Gas structure inside dust cavities of transition disks: Ophiuchus IRS 48 observed by ALMA
Context. Transition disks are recognized by the absence of emission of small dust grains inside a radius of up to several 10s of AUs. Owing to the lack of angular resolution and sensitivity, the gas
We present high-resolution (0.''3 = 16 AU), high signal-to-noise ratio Submillimeter Array observations of the 870 {mu}m (345 GHz) continuum and CO J = 3 - 2 line emission from the protoplanetary
Protoplanetary disk masses from CO isotopologue line emission
Context. One of the methods for deriving disk masses relies on direct observations of the gas, whose bulk mass is in the outer cold regions (T. 30 K). This zone can be well traced by rotational lines
Survival of molecular gas in cavities of transition disks - I. CO
(Abridged) Planet formation is closely related to the structure and dispersal of protoplanetary disks. A certain class of disks, called transition disks, exhibit cavities in dust images at scales of
Determining the mid-plane conditions of circumstellar discs using gas and dust modelling: a study of HD 163296
The mass of gas in protoplanetary discs is a quantity of great interest for assessing their planet formation potential. Disc gas masses are, however, traditionally inferred from measured dust masses
A Parametric Modeling Approach to Measuring the Gas Masses of Circumstellar Disks
The disks that surround young stars are mostly composed of molecular gas, which is harder to detect and interpret than the accompanying dust. Disk mass measurements have therefore relied on large and
Dust properties of protoplanetary disks in the Taurus-Auriga star forming region from millimeter wavelengths
We present the most sensitive 3 mm-survey to date of protoplanetary disks carried out in the Taurus-Auriga star forming region (average rms of about 0.3 mJy), using the IRAM PdBI. With our high
Gas and dust mass in the disc around the Herbig Ae star HD 169142
Context. Spatially resolved observations of circumstellar discs at millimetre wavelengths allow detailed comparisons with theoretical models for the radial and vertical distribution of the material.