Collisional modelling of the debris disc around HIP 17439

Abstract

We present an analysis of the debris disc around the nearby K2 V star HIP 17439. In the context of the Herschel DUNES key programme the disc was observed and spatially resolved in the far-IR with the Herschel PACS and SPIRE instruments. In a first model, Ertel et al. (2014) assumed the size and radial distribution of the circumstellar dust to be independent power laws. There, by exploring a very broad range of possible model parameters several scenarios capable of explaining the observations were suggested. In this paper, we perform a follow-up in-depth collisional modelling of these scenarios trying to further distinguish between them. In our models we consider collisions, direct radiation pressure, and drag forces, i.e. the actual physical processes operating in debris discs. We find that all scenarios discussed in Ertel et al. are physically sensible and can reproduce the observed SED along with the PACS surface brightness profiles reasonably well. In one model, the dust is produced beyond 120au in a narrow planetesimal belt and is transported inwards by Poynting-Robertson and stellar wind drag. A good agreement with the observed radial profiles would require stellar winds by about an order of magnitude stronger than the solar value, which is not supported, although not ruled out, by observations. Another model consists of two spatially separated planetesimal belts, a warm inner and a cold outer one. This scenario would probably imply the presence of planets clearing the gap between the two components. Finally, we show qualitatively that the observations can be explained by assuming the dust is produced in a single, but broad planetesimal disc with a surface density of solids rising outwards, as expected for an extended disc that experiences a natural inside-out collisional depletion. Prospects of discriminating between the competing scenarios by future observations are discussed.

arXiv commentAstronomy and Astrophysics (accepted for publication). 11 pages, 8 figures

References in corpus (49)

• Validation of the new Hipparcos reduction
• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
• The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory
• The Herschel-SPIRE instrument and its in-flight performance
• Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics
• Catastrophic disruptions revisited
• Scattering by Interstellar Dust Grains: Optical and Ultraviolet
• Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Southern Sample
• New Mass Loss Measurements from Astrospheric Lyman-alpha Absorption
• Measured Mass Loss Rates of Solar-like Stars as a Function of Age and Activity
• Testing a Predictive Theoretical Model for the Mass Loss Rates of Cool Stars
• Variations on Debris Disks: Icy Planet Formation at 30-150 AU for 1-3 Solar Mass Main Sequence Stars
• In-flight calibration of the Herschel-SPIRE instrument
• DUst Around NEarby Stars. The survey observational results
• New Debris Disks Around Young, Low Mass Stars Discovered With The Spitzer Space Telescope
• Long-Term Collisional Evolution of Debris Disks
• The Extrasolar Planet epsilon Eridani b - Orbit and Mass
• Asteroid Belts in Debris Disk Twins: VEGA and FOMALHAUT
• Steady-State Size Distributions for Collisional Populations: Analytical Solution with Size-Dependent Strength
• Debris disc stirring by secular perturbations from giant planets
• Collisional processes and size distribution in spatially extended debris discs
• Resolved Debris Discs Around A Stars in the Herschel DEBRIS Survey
• Herschel imaging of 61 Vir: implications for the prevalence of debris in low-mass planetary systems
• GASPS - a Herschel survey of gas and dust in Protoplanetary Disks: Summary and Initial Statistics
• An icy Kuiper-Belt around the young solar-type star HD 181327
• Outer edges of debris discs: how sharp is sharp?
• Resolving debris discs in the far-infrared: early highlights from the DEBRIS survey
• Metallicity of solar-type stars with debris discs and planets
• A Trend Between Cold Debris Disk Temperature and Stellar Type: Implications for the Formation and Evolution of Wide-Orbit Planets
• A DEBRIS Disk Around The Planet Hosting M-star GJ581 Spatially Resolved with Herschel
• HST and Spitzer Observations of the HD 207129 Debris Ring
• Are Debris Disks and Massive Planets Correlated?
• Herschel's "Cold Debris Disks": Background Galaxies or Quiescent Rims of Planetary Systems?
• On the Relationship Between Debris Disks and Planets
• Hubble Space Telescope Observations of the HD 202628 Debris Disk
• Modeling the HD32297 Debris Disk with Far-IR Herschel Data
• The cold origin of the warm dust around epsilon Eridani
• Cold dust around nearby stars (DUNES). First results: A resolved exo-Kuiper belt around the solar-like star zeta^2 Ret
• Correlations between the stellar, planetary and debris components of exoplanet systems observed by $\text{Herschel}$
• The Debris Disk of Vega: A Steady-State Collisional Cascade, Naturally
• Target selection for the SUNS and DEBRIS surveys for debris discs in the solar neighbourhood
• Multi-wavelength modeling of the spatially resolved debris disk of HD 107146
• A Herschel resolved far-infrared dust ring around HD 207129
• Herschel discovery of a new class of cold, faint debris discs
• The galactic unclassified B[e] star HD 50138. II. Interferometric constraints on the close circumstellar environment
• Multi-Wavelength Modelling of the Beta Leo Debris Disc: 1, 2 or 3 planetesimal populations?
• Observing planet-disk interaction in debris disks
• Potential multi-component structure of the debris disk around HIP 17439 revealed by Herschel/DUNES
• The debris disk around gamma Doradus resolved with Herschel

Cited by in corpus (17)

• The dust grain size - stellar luminosity trend in debris discs
• Solution to the debris disc mass problem: planetesimals are born small?
• Constraints on Planetesimal Collision Models in Debris Disks
• Collisional modelling of the AU Microscopii debris disc
• Debris Disc Constraints on Planetesimal Formation
• Warm exo-Zodi from cool exo-Kuiper belts: the significance of P-R drag and the inference of intervening planets
• A $75\%$ Occurrence Rate of Debris Discs around F stars in the $\beta$ Pic Moving Group
• Does warm debris dust stem from asteroid belts?
• Origin and evolution of two-component debris discs and an application to the q${}^1$ Eridani system
• New constraints on the millimetre emission of six debris disks
• Comprehensive analysis of HD 105, a young Solar System analog
• Dust Spreading in Debris Discs: Do Small Grains Cling on to Their Birth Environment?
• The influence of dust grain porosity on the analysis of debris disc observations
• Dust production in debris discs: constraints on the smallest grains
• A PR drag origin for the Fomalhaut disk's pervasive inner dust: constraints on collisional strengths, icy composition, and embedded planets
• A Catalogue of Interstellar Material Delivery From Nearby Debris Disks
• Interferometric Detection and Orbit Modeling of the Subcomponent in the Hot-dust System $\kappa$ Tuc A: A Low-mass Star on an Eccentric Orbit in a Hierarchical-quintuple System