Discovery of carbon monoxide emission from five debris disks around young A-type stars
arXiv:2509.16104 · doi:10.1051/0004-6361/202554848
Abstract
Over the past fifteen years, surveys mainly at millimeter wavelengths have led to the discovery of 20 gas-bearing debris disks, most of them surrounding young intermediate-mass stars. Exploring the properties and origin of this gas could be fundamental to better understanding the transition between the protoplanetary and debris disk phases, the evolution of icy planetesimal belts, and the formation of planetary atmospheres. To expand the list of known CO-bearing debris disks and to improve our knowledge of the environmental conditions under which they can form, we targeted twelve dust-rich debris disks around young (50 Myr) intermediate-mass stars. Using the ALMA 12-m Array we performed millimeter continuum and CO line observations to search for dust and gas and to measure their quantity and spatial distribution. We discovered CO gas in five disks. Two of them have a low CO content of a few times 10 M, similar to that of Pic. The other three disks, however, are CO-rich with M. By combining our results with those of other studies we concluded, in agreement with previous findings, that the detection rate of CO gas is significantly higher for disks around stars with (A8A0 spectral type) than for disks around less luminous stars (, K7A9). A comparison of the measured CO masses and the estimated mass loss rates of solids in disks with low CO content (10 M) suggests that collisions may play a role in CO gas production in such systems. Interestingly, however, the estimated mass loss rates of CO-rich debris disks are not higher than those of systems with low CO content. In light of this finding, we speculate on what could lead to the formation of CO-rich debris disks.
Accepted for publication in A&A (33 pages, 13 figures)
References in corpus (75)
- Gaia Data Release 3: Summary of the content and survey properties
- Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
- The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
- Gaia Early Data Release 3: Photometric content and validation
- Second ROSAT all-sky survey (2RXS) source catalogue
- A Steeper than Linear Disk Mass-Stellar Mass Scaling Relation
- Pulkovo Compilation of Radial Velocities for 35495 Hipparcos Stars in a Common System
- The Hipparcos-Gaia Catalog of Accelerations: Gaia EDR3 Edition
- Three-dimensional mapping of the local interstellar medium with composite data
- Stellar and substellar companions from Gaia EDR3 -- Proper motion anomaly and resolved common proper motion pairs
- Molecular Gas Clumps from the Destruction of Icy Bodies in the Pictoris Debris Disk
- Abundant Circumstellar Silica Dust and SiO Gas Created by a Giant Hypervelocity Collision in the ~12 Myr HD172555 System
- Detection of exocometary CO within the 440 Myr-old Fomalhaut belt: a similar CO+CO ice abundance in exocomets and Solar System comets
- Thermal desorption of circumstellar and cometary ice analogs
- Debris Disks in the Scorpius-Centaurus OB Association Resolved by ALMA
- Exocometary gas structure, origin and physical properties around Pictoris through ALMA CO multi-transition observations
- Disk Radii and Grain Sizes in Herschel-Resolved Debris Disks
- Molecular gas in debris disks around young A-type stars
- Kuiper Belt-Like Hot and Cold Populations of Planetesimal Inclinations in the Pictoris Belt Revealed by ALMA
- The star formation history of the Sco-Cen association. Coherent star formation patterns in space and time
- 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
- The mass of Beta Pictoris c from Beta Pictoris b orbital motion
- The Empirical Limits of Gyrochronology
- Solution to the debris disc mass problem: planetesimals are born small?
- The Gaia-ESO Survey: Empirical estimates of stellar ages from lithium equivalent widths (EAGLES)
- Stirring in massive, young debris discs from spatially resolved Herschel images
- Significance Mode Analysis (SigMA) for hierarchical structures. An application to the Sco-Cen OB association
- Corona-Australis DANCe. I. Revisiting the census of stars with Gaia-DR2 data
- Planet populations inferred from debris discs: insights from 178 debris systems in the ISPY, LEECH and LIStEN planet-hunting surveys
- A gap in HD 92945's broad planetesimal disc revealed by ALMA
- ALMA observations of the narrow HR 4796A debris ring
- Wide binaries are rare in open clusters
- A Census of the Taurus Star-forming Region and Neighboring Associations with Gaia
- Gas and dust around A-type stars at tens of Myr:signatures of cometary breakup
- On the mass accretion rate and infrared excess in Herbig Ae/Be Stars
- A Number of Nearby Moving Groups may be Fragments of Dissolving Open Clusters
- Thermophysical evolution of planetesimals in the Primordial Disk
- Population synthesis of exocometary gas around A stars
- ALMA Detection of Extended Millimeter Halos in the HD 32297 and HD 61005 Debris Disks
- BAFFLES: Bayesian Ages for Field Lower-Mass Stars
- Insights into the planetary dynamics of HD 206893 with ALMA
- Multiple Rings of Millimeter Dust Emission in the HD 15115 Debris Disk
- A Occurrence Rate of Debris Discs around F stars in the Pic Moving Group
- Survey of planetesimal belts with ALMA: gas detected around the Sun-like star HD 129590
- ALMA Survey of Lupus Class III Stars: Early Planetesimal Belt Formation and Rapid Disk Dispersal
- Herbig Stars: A Quarter Century of Progress
- On the underestimation of dust mass in protoplanetary disks: Effects of disk structure and dust properties
- New Coronae and Stellar Associations Revealed by a Clustering Analysis of the Solar Neighborhood
- A new sample of warm extreme debris disks from the ALLWISE catalog
- New debris disks in nearby young moving groups
- Photoevaporation of Grain-Depleted Protoplanetary Disks around Intermediate-Mass Stars: Investigating Possibility of Gas-Rich Debris Disks as Protoplanetary Remnants
- Formation of secondary atmospheres on terrestrial planets by late disk accretion
- Revisiting the pulsational characteristics of the exoplanet host star Pictoris
- Is there more than meets the eye? Presence and role of submicron grains in debris discs
- Lack of other molecules in CO-rich debris discs: is it primordial or secondary gas?
- ALMA Observations of the HD~110058 debris disk
- Primordial or Secondary? Testing models of debris disk gas with ALMA
- Herschel Observations of Dusty Debris Disks
- Mid-infrared Studies of HD 113766 and HD 172555: Assessing Variability in the Terrestrial Zone of Young Exoplanetary Systems
- Resolving Structure in the Debris Disk around HD 206893 with ALMA
- The Stars Kepler Missed: Investigating the Kepler Target Selection Function Using Gaia DR2
- Carbon monoxide gas produced by a giant impact in the inner region of a young system
- Vertical evolution of exocometary gas: I. How vertical diffusion shortens the CO lifetime
- Gap carving by a migrating planet embedded in a massive debris disc
- Is the Young Star RZ Piscium Consuming Its Own (Planetary) Offspring?
- A molecular wind blows out of the Kuiper belt
- Discovery of an Edge-on Circumstellar Debris Disk Around BD+45598: a Newly Identifed Member of the Pictoris Moving Group
- Rapid CO gas dispersal from NO Lup's class III circumstellar disc
- Revealing asymmetrical dust distribution in the inner regions of HD 141569
- The big sibling of AU Mic: a cold dust-rich debris disk around CP-72 2713 in the Pic moving group
- Searching for new young stars in the northern hemisphere: The Pisces Moving Group
- Physical conditions of gas components in debris disks of 49 Ceti and HD 21997
- A Mixed Stirring Mechanism for Debris Discs with Giant and Dwarf Planetary Perturbations