Molecular gas in debris disks around young A-type stars

Abstract

According to the current paradigm of circumstellar disk evolution, gas-rich primordial disks evolve into gas-poor debris disks compose of second-generation dust. To explore the transition between these phases, we searched for ${}^{12}$CO, ${}^{13}$CO, and C${}^{18}$O emission in seven dust-rich debris disks around young A-type stars, using ALMA in Band 6. We discovered molecular gas in three debris disks. In all these disks, the ${}^{12}$CO line was optically thick, highlighting the importance of less abundant molecules in reliable mass estimates. Supplementing our target list by literature data, we compiled a volume-limited sample of dust-rich debris disks around young A-type stars within 150 pc. We obtained a CO detection rate of 11/16 above a ${}^{12}$CO J=2$-$1 line luminosity threshold of $\sim 1.4\times 10^4$ Jykms${}^{-1}$pc${}^2$ in the sample. This high incidence implies that the presence of CO gas in bright debris disks around young A-type stars is likely more the rule than the exception. Interestingly, dust-rich debris disks around young FG-type stars exhibit, with the same detectability threshold as for A-type stars, significantly lower gas incidence. While the transition from protoplanetary to debris phase is associated with a drop of dust content, our results exhibit a large spread in the CO mass in our debris sample, with peak values comparable to those in protoplanetary Herbig Ae disks. In the particularly CO-rich debris systems the gas may have primordial origin, characteristic of a hybrid disk.

arXiv commentAccepted for publication in ApJ, 11 pages, 3 figures, 2 tables

References in corpus (54)

• Validation of the new Hipparcos reduction
• A Hipparcos census of the nearby OB associations
• The Mass Dependence Between Protoplanetary Disks and their Stellar Hosts
• Gaia Data Release 1: Astrometry - one billion positions, two million proper motions and parallaxes
• ALMA Survey of Lupus Protoplanetary Disks I: Dust and Gas Masses
• The photodissociation and chemistry of CO isotopologues: applications to interstellar clouds and circumstellar disks
• A self-consistent, absolute isochronal age scale for young moving groups in the solar neighbourhood
• Binarity in Brown Dwarfs: T Dwarf Binaries Discovered with the Hubble Space Telescope WPFC2
• The Star-formation History and Accretion-Disk Fraction Among the K-Type Members of the Scorpius-Centaurus OB Association
• Discovery of seven T Tauri stars and a brown dwarf candidate in the nearby TW Hydrae Association
• On the age of the $\beta$ Pictoris moving group
• Characterization of Dusty Debris Disks: the IRAS and Hipparcos Catalogs
• ALMA unveils rings and gaps in the protoplanetary system HD 169142: signatures of two giant protoplanets
• Molecular Gas Clumps from the Destruction of Icy Bodies in the $\beta$ Pictoris Debris Disk
• Nearby debris disk systems with high fractional luminosity reconsidered
• A Spatially Resolved Vertical Temperature Gradient in the HD 163296 Disk
• The Age of Beta Pic
• Protoplanetary disk masses from CO isotopologues line emission
• UVMULTIFIT: A versatile tool for fitting astronomical radio interferometric data
• A 40 Myr Old Gaseous Circumstellar Disk at 49 Ceti: Massive CO-Rich Comet Clouds at Young A-Type Stars
• Exocometary gas in the HD 181327 debris ring
• Disk Imaging Survey of Chemistry with SMA (DISCS): I. Taurus Protoplanetary Disk Data
• Predictions for the secondary CO, C and O gas content of debris discs from the destruction of volatile-rich planetesimals
• ALMA observations of the molecular gas in the debris disk of the 30 Myr old star HD 21997
• Millimeter imaging of HD 163296: probing the disk structure and kinematics
• Detection of exocometary CO within the 440 Myr-old Fomalhaut belt: a similar CO+CO${}_2$ ice abundance in exocomets and Solar System comets
• Debris Disks in the Scorpius-Centaurus OB Association Resolved by ALMA
• Exocometary gas structure, origin and physical properties around $\beta$ Pictoris through ALMA CO multi-transition observations
• Disk Radii and Grain Sizes in Herschel-Resolved Debris Disks
• Disks around CQ Tau and MWC 758: dense PDR or gas dispersal?
• A sensitive survey for 13CO, CN, H2CO and SO in the disks of T Tauri and Herbig Ae stars
• Azimuthal asymmetries in the debris disk around HD61005
• ALMA observations of the $\eta$ Corvi debris disc: inward scattering of CO-rich exocomets by a chain of 3-30 M${}_{\oplus }$ planets?
• Five steps in the evolution from protoplanetary to debris disk
• Sub-mm observations and modelling of Vega type stars
• High Resolution HST-STIS Spectra of CI and CO in the Beta Pictoris Circumstellar Disk
• A Trend Between Cold Debris Disk Temperature and Stellar Type: Implications for the Formation and Evolution of Wide-Orbit Planets
• 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
• Gas and dust in the Beta Pictoris Moving Group as seen by the Herschel Space Observatory
• Molecular gas in young debris disks
• Chemistry in Disks X: The Molecular Content of Proto-planetary Disks in Taurus
• Stirring in massive, young debris discs from spatially resolved Herschel images
• Radial Surface Density Profiles of Gas and Dust in the Debris Disk around 49 Ceti
• First optical images of circumstellar dust surrounding the debris disk candidate HD 32297
• Long-wavelength observations of debris discs around sun-like stars
• A Keplerian Disk around the Herbig Ae star HD169142
• Does the Debris Disk around HD 32297 Contain Cometary Grains?
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• Copious Amounts of Hot and Cold Dust Orbiting the Main Sequence A-type Stars HD 131488 and HD 121191
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• A CO survey in planet-forming disks: characterizing the gas content in the epoch of planet formation
• The hybrid disks: a search and study to better understand evolution of disks
• Herschel Observations of Dusty Debris Disks

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• Diversity of Exoplanets
• Discovery of carbon monoxide emission from five debris disks around young A-type stars
• High CO/H2 ratios supports an exocometary origin for a CO-rich debris disk
• Late gas released in the young Kuiper belt could have significantly contributed to the carbon enrichment of the atmospheres of Neptune and Uranus
• Water vapor as a probe of the origin of gas in debris disks
• HD 44892: The youngest (or oldest?) gas-harbouring debris disc around an intermediate mass star
• The search for gas in debris discs: ALMA detection of CO gas in HD 36546
• Resolving the large exoKuiper belt of the HD 126062 debris disc and extended gas emission in its vicinity