Resolving the large exoKuiper belt of the HD 126062 debris disc and extended gas emission in its vicinity

Abstract

Intermediate-mass stars (1-3 Msun) host some of the brightest and best-studied debris discs. This stellar class is also the most frequent host of molecular gas in systems older than typical protoplanetary disc lifetimes, and the most likely to host detected giant planets in radial-velocity surveys. The debris discs of intermediate-mass stars have therefore become fertile ground for studying disc-planet interactions. In this work, we present the first ALMA observations toward the A-type star HD 126062, located in Upper Centaurus Lupus / Lower Centaurus Crux, with the aim of characterising its debris disc. We probed the thermal continuum emission using observations at 1.3 mm, analysed through image reconstruction under different visibility-weighting regimes and parametric model fitting to the observed visibilities. The setup also covered the frequency of the 12CO(2-1) line, allowing imaging of gas near the system. We detected dust continuum emission from an exo-Kuiper belt around HD 126062. Modelled as a Gaussian ring, the visibilities are consistent with a radial separation R = 2.01'' (+0.04, -0.05), equivalent to ~270 (+5, -4) au, and a full width at half maximum DeltaR = 0.71'' +- 0.09 (95 +- 12 au). The continuum emission appears nearly face-on, with inclination <=17 deg. 12CO(2-1) emission is detected in the vicinity of the debris disc, with most of it located external to the exo-Kuiper belt. The exo-Kuiper belt characterised here is among the largest yet detected and agrees with previous predictions of the dust distribution based on spectral energy distribution fitting. The morphology and velocity offset relative to the systemic velocity suggest that the gas is not associated with the star or disc, but likely originates from a diffuse cloud in the nearby galaxy.

arXiv commentAbstract metadata edited for character limit

References in corpus (74)

• Array Programming with NumPy
• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• 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
• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 20945
• Images of a fourth planet orbiting HR 8799
• Trigonometric Parallaxes Of High-Mass Star Forming Regions: Our View Of The Milky Way
• Giant Planet Occurrence in the Stellar Mass-Metallicity Plane
• A probable giant planet imaged in the Beta Pictoris disk
• The photodissociation and chemistry of CO isotopologues: applications to interstellar clouds and circumstellar disks
• A Steeper than Linear Disk Mass-Stellar Mass Scaling Relation
• The Star-formation History and Accretion-Disk Fraction Among the K-Type Members of the Scorpius-Centaurus OB Association
• The Circular Velocity Curve of the Milky Way from $5$ to $25$ kpc
• The Runts of the Litter: Why planets formed through gravitational instability can only be failed binary stars
• Precise Radial Velocities of Giant Stars VII. Occurrence Rate of Giant Extrasolar Planets as a Function of Mass and Metallicity
• Molecular Gas Clumps from the Destruction of Icy Bodies in the $\beta$ Pictoris Debris Disk
• CO emission from discs around isolated HAeBe and Vega-excess stars
• A multi-wavelength analysis for interferometric (sub-)mm observations of protoplanetary disks: radial constraints on the dust properties and the disk structure
• Disk evolution in the solar neighborhood. I Disk frequencies from 1 to 100 Myr
• Debris disks as signposts of terrestrial planet formation
• Exocometary gas in the HD 181327 debris ring
• Resolved Debris Discs Around A Stars in the Herschel DEBRIS Survey
• Molecular Gas Properties on Cloud Scales Across the Local Star-forming Galaxy Population
• Scaling Relations Associated with Millimeter Continuum Sizes in Protoplanetary Disks
• ALMA observations of the molecular gas in the debris disk of the 30 Myr old star HD 21997
• Detection of exocometary CO within the 440 Myr-old Fomalhaut belt: a similar CO+CO${}_2$ ice abundance in exocomets and Solar System comets
• Do Two Temperature Debris Disks Have Multiple Belts?
• Herschel images of Fomalhaut. An extrasolar Kuiper Belt at the height of its dynamical activity
• Debris Disks in the Scorpius-Centaurus OB Association Resolved by ALMA
• Millimeter Emission Structure in the first ALMA Image of the AU Mic Debris Disk
• Molecular gas in debris disks around young A-type stars
• Gas vs dust sizes of protoplanetary disks: effects of dust evolution
• A Complete ALMA Map of the Fomalhaut Debris Disk
• Cooling sequences and color-magnitude diagrams for cool white dwarfs with hydrogen-atmospheres
• The dust grain size - stellar luminosity trend in debris discs
• ALMA observations of the $\eta$ Corvi debris disc: inward scattering of CO-rich exocomets by a chain of 3-30 M${}_{\oplus }$ planets?
• AUTO-MULTITHRESH: A General Purpose Automasking Algorithm
• Kuiper Belt-Like Hot and Cold Populations of Planetesimal Inclinations in the $\beta$ Pictoris Belt Revealed by ALMA
• Dynamical evolution of an eccentric planet and a less massive debris disc
• Resolving the Planetesimal Belt of HR 8799 with ALMA
• The Jeans Mass as a Fundamental Measure of Self-Gravitating Disc Fragmentation and Initial Fragment Mass
• Solution to the debris disc mass problem: planetesimals are born small?
• Flybys in protoplanetary discs: II. Observational signatures
• Radial Surface Density Profiles of Gas and Dust in the Debris Disk around 49 Ceti
• A Spitzer MIPS Study of 2.5-2.0 M\odot Stars in Scorpius-Centaurus
• Planet populations inferred from debris discs: insights from 178 debris systems in the ISPY, LEECH and LIStEN planet-hunting surveys
• Spatially resolved imaging of the inner Fomalhaut disk using JWST/MIRI
• A resolved debris disk around the candidate planet-hosting star HD95086
• Population synthesis of exocometary gas around A stars
• A statistically significant lack of debris discs in medium separation binary systems
• The hybrid disks: a search and study to better understand evolution of disks
• A detailed characterization of HR 8799's debris disk with ALMA in Band 7
• The mass and size of Herbig disks as seen by ALMA
• Insights into the planetary dynamics of HD 206893 with ALMA
• ALMA Reveals a Misaligned Inner Gas Disk inside the Large Cavity of a Transitional Disk
• A $75\%$ Occurrence Rate of Debris Discs around F stars in the $\beta$ Pic Moving Group
• ISPY -- NACO Imaging Survey for Planets around Young stars: Survey description and results from the first 2.5 years of observations
• Formation of secondary atmospheres on terrestrial planets by late disk accretion
• Photoevaporation of Grain-Depleted Protoplanetary Disks around Intermediate-Mass Stars: Investigating Possibility of Gas-Rich Debris Disks as Protoplanetary Remnants
• Dust Populations in the Iconic Vega Planetary System Resolved by ALMA
• Primordial or Secondary? Testing models of debris disk gas with ALMA
• Unlocking the secrets of the midplane gas and dust distribution in the young hybrid disc HD 141569
• Gap carving by a migrating planet embedded in a massive debris disc
• Constraining the presence of giant planets in two-belt debris disk systems with VLT/SPHERE direct imaging and dynamical arguments
• Eccentric debris disc morphologies I: exploring the origin of apocentre and pericentre glows in face-on debris discs
• A molecular wind blows out of the Kuiper belt
• Rapid CO gas dispersal from NO Lup's class III circumstellar disc
• Bird's eye view of molecular clouds in the Milky Way: II. Cloud kinematics from sub-pc to kpc scales
• Eccentric debris disc morphologies II: Surface brightness variations from overlapping orbits in narrow eccentric discs
• A Radiatively Driven Wind from the eta Tel Debris Disk
• Stellar winds can affect gas dynamics in debris disks and create observable belt winds
• The first scattered light images of HD 112810, a faint debris disk in the Sco-Cen association