The hybrid disks: a search and study to better understand evolution of disks

Abstract

The increased sensitivity of millimeter-wave facilities now makes possible the detection of low amounts of gas in debris disks. Some of the gas-rich debris disks harbor peculiar properties, with possible pristine gas and secondary generated dust. The origin of the gas in these hybrid disks is strongly debated and the current sample is too sparse to understand this phenomenon. More detections are necessary to increase the statistics on this population. Lying at the final stages of evolution of proto-planetary disks and at the beginning of the debris disk phase, these objects could provide new insight into the processes involved in the making of planetary systems. We carried out a deep survey of the 12CO(2-1) and 12CO(3-2) lines with the APEX and IRAM radiotelescopes in young debris disks selected according to hybrid disk properties. The survey is complemented with a bibliographic study of the ratio between the emission of the gas and the continuum (S_CO/F_cont) in CTTS, Herbig Ae, WTTS, hybrid, and debris disks. Our sub-mm survey comprises 25 stars, including 17 new targets, and we increase the sensitivity limit by a factor 2 on eight sources compared to similar published studies. We report a 4sigma tentative detection of a double-peaked 12CO(2-1) line around HD23642; an eclipsing binary located in the Pleiades. We also reveal a correlation between the emission of the CO gas and the dust continuum from CTTS, Herbig Ae and few debris disks. The observed trend of the gas to dust flux ratio suggests a concurrent dissipation of the dust and gas components. Hybrid disks systematically lie above this trend, suggesting that these systems may witness a transient phase, when the dust has evolved more rapidly than the gas, with a flux ratio S_CO/F_cont enhanced by a factor of between 10 and 100 compared to standard (proto-)planetary disks.

Accepted for publication in Astronomy&Astrophysics

References in corpus (51)

• Protoplanetary Disk Structures in Ophiuchus
• An Optical Spectroscopic Study of T Tauri Stars. I. Photospheric Properties
• Debris Disk Evolution Around A Stars
• Accretion in the Rho-Oph pre-main sequence stars
• Search for Associations Containing Young stars (SACY): I. Sample & Searching Method
• Structure and evolution of pre-main sequence circumstellar disks
• Spitzer IRS Spectroscopy of IRAS-Discovered Debris Disks
• Accretion Rates in Herbig Ae stars
• Direct Imaging of Fine Structures in Giant Planet Forming Regions of the Protoplanetary Disk around AB Aurigae
• Molecular Gas Clumps from the Destruction of Icy Bodies in the $\beta$ Pictoris Debris Disk
• Demographics of Transition Objects
• Nearby debris disk systems with high fractional luminosity reconsidered
• LkH$\alpha$ 330: Evidence for dust clearing through resolved submillimeter imaging
• The Impact of Dust Evolution and Photoevaporation on Disk Dispersal
• Evolution of emission line activity in intermediate mass young stars
• Resolved Debris Discs Around A Stars in the Herschel DEBRIS Survey
• Parameters of Herbig Ae/Be and Vega-type stars
• A search for strong, ordered magnetic fields in Herbig Ae/Be stars
• Formation and Evolution of Planetary Systems: Upper Limits to the Gas Mass in Disks Around Sun-like Stars
• Millimeter imaging of HD 163296: probing the disk structure and kinematics
• ALMA hints at the presence of two companions in the disk around HD 100546
• Debris Disks in the Scorpius-Centaurus OB Association Resolved by ALMA
• Disks around CQ Tau and MWC 758: dense PDR or gas dispersal?
• Short dissipation times of proto-planetary discs - an artifact of selection effects?
• CO gas inside the protoplanetary disk cavity in HD 142527: disk structure from ALMA
• Brown dwarf disks with ALMA
• A Resolved Molecular Gas Disk around the Nearby A Star 49 Ceti
• The Dust Properties of Eight Debris Disk Candidates as Determined by Submillimeter Photometry
• CO mass upper limits in the Fomalhaut ring - the importance of NLTE excitation in debris discs and future prospects with ALMA
• Gas and dust in the Beta Pictoris Moving Group as seen by the Herschel Space Observatory
• Probing stellar accretion with mid-infrared hydrogen lines
• The masses of young stars: CN as a probe of dynamical masses
• A Sensitive Identification of Warm Debris Disks in the Solar Neighborhood Through Precise Calibration of Saturated WISE Photometry
• Comparison of the dust and gas radial structure in the transition disk [PZ99] J160421.7-213028
• The Nature of Transition Circumstellar Disks II. Southern Molecular Clouds
• Strong effect of the cluster environment on the size of protoplanetary discs?
• ALMA observations of the debris disk around the young Solar Analog HD 107146
• Resolved debris disk emission around eta Tel: a young Solar System or ongoing planet formation?
• A Disk-based Dynamical Constraint on the Mass of the Young Binary DQ Tau
• ALMA Observations of the T Tauri Binary System AS 205: Evidence for Molecular Winds and/or Binary Interactions
• A CO survey in planet-forming disks: characterizing the gas content in the epoch of planet formation
• Investigating the flyby scenario for the HD 141569 system
• Molecules in the disk orbiting the twin young suns of V4046 Sgr
• A ring-like concentration of mm-sized particles in Sz 91
• Captured at Millimeter Wavelengths: a Flare from the Classical T Tauri Star DQ Tau
• Is the HD 15115 inner disk really asymmetrical ?
• Resolved Gas Interior to the Dust Rings of the HD 141569 Disk
• Anomalous Accretion Activity and the Spotted Nature of the DQ Tau Binary System
• Resolved Millimeter Emission from the HD 15115 Debris Disk
• Sensitive survey for 13CO, CN, H2CO, and SO in the disks of T Tauri and Herbig Ae stars II: Stars in $\rho$ Oph and upper Scorpius
• Interferometric Evidence for Resolved Warm Dust in the DQ Tau System

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• Chemical enrichment of giant planets and discs due to pebble drift
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• Peter Pan Disks: Long-lived Accretion Disks Around Young M Stars
• New millimeter CO observations of the gas-rich debris disks 49 Cet and HD 32297
• Transition disks: the observational revolution from SEDs to imaging
• Molecular reconnaissance of the $\beta$ Pictoris gas disk with the SMA: a low HCN/(CO+CO${}_2$) outgassing ratio and predictions for future surveys
• ALMA Survey of Lupus Class III Stars: Early Planetesimal Belt Formation and Rapid Disk Dispersal
• Herbig Stars: A Quarter Century of Progress
• The surprisingly low carbon mass in the debris disk around HD 32297
• Lack of other molecules in CO-rich debris discs: is it primordial or secondary gas?
• Stellar Photospheric Abundances as a Probe of Disks and Planets
• ALMA Observations of the HD~110058 debris disk
• Unlocking the secrets of the midplane gas and dust distribution in the young hybrid disc HD 141569
• Stars and brown dwarfs in the sigma Orionis cluster. IV. IDS/INT and OSIRIS/GTC spectroscopy and Gaia DR2 astrometry
• Long-lived protoplanetary disks in multiple systems: the VLA view of HD 98800
• Modelling the Spatial Distribution and Origin of CO Gas in Debris Disks
• Extended Millimeter Emission in the HD 141569 Circumstellar Disk Detected with ALMA
• Debris Disks: Probing Planet Formation
• The GRAVITY Young Stellar Object survey VIII. Gas and dust faint inner rings in the hybrid disk of HD141569
• X-Shooter Survey of Young Intermediate Mass Stars -- I. Stellar Characterization and Disc Evolution
• Characterization of debris disks observed with SPHERE
• A transitional disk around an intermediate mass star in the sparse population of the Orion OB1 Association
• A catalog of collected debris disks: properties, classifications and correlations between disks and stars/planets
• High resolution ALMA observation of the ${}^{12}$CO(3-2) and 350 GHz continuum emissions of the debris disc of 49 Ceti
• An Incipient Debris Disk in the Chamaeleon I Cloud
• The Disks In Scorpius-Centaurus Survey (DISCS) I: Four Newly-Resolved Debris Disks in Polarized Intensity Light
• Discovery of carbon monoxide emission from five debris disks around young A-type stars
• The influence of tight binaries on proto-planetary disk masses
• Resolving the large exoKuiper belt of the HD 126062 debris disc and extended gas emission in its vicinity
• Impact of Size-dependent Grain Temperature on Gas-Grain Chemistry in Protoplanetary Disks: the case of low mass star disks
• The search for gas in debris discs: ALMA detection of CO gas in HD 36546
• HD 44892: The youngest (or oldest?) gas-harbouring debris disc around an intermediate mass star