Resolved debris disc emission around η Telescopii: a young solar system or ongoing planet formation?

  title={Resolved debris disc emission around $\eta$ Telescopii: a young solar system or ongoing planet formation?},
  author={R. J. Smith and Laura Churcher and Mark C. Wyatt and Margaret Moerchen and Charles M. Telesco},
  journal={Astronomy and Astrophysics},
Aims. 60% of the A star members of the 12 Myr oldβ Pictoris moving group (BPMG) show significant excess emissi on in the mid-infrared, several million years after the proto-plane tary disk is thought to disperse. Theoretical models suggest this peak may coincide with the formation of Pluto-sized planetesimals in the disk, stirring smaller bodies into collisional destru ction. Here we present resolved mid-infrared imaging of the disk ofη Tel (A0V in the BPMG) and consider its implications for… 

Figures and Tables from this paper

Resolved imaging of the HD 191089 debris disc
Two-thirds of the F star members of the 12 Myr old β Pictoris moving group (BPMG) show significant excess emission in the mid-infrared, several million years after the expected dispersal of the
Warm dusty discs: exploring the A star 24 μm debris population
Aims. Studies of the debris disc phenomenon have shown that most systems are analogous to the Edgeworth-Kuiper belt (EKB). In this study we aim to determine how many of the IRAS 25 μm excesses
Collisional modelling of the AU Microscopii debris disc
The spatially resolved AU Mic debris disc is among the most famous and best-studied debris discs. We aim at a comprehensive understanding of the dust production and the dynamics of the disc objects
Resolving the hot dust around HD69830 and η Corvi with MIDI and VISIR
Aims. Most of the known debris discs exhibit cool dust in regions analogous to the Edgeworth-Kuiper Belt. However, a rare subset show hot excess from within a few AU, which moreover is often inferred
Dust discs around intermediate-mass and Sun-like stars in the 16 Myr old NGC 1960 open cluster
We present an analysis of Spitzer IRAC (3.6–8 μm) and MIPS (24 μm) imaging of members of the 16 Myr old open cluster NGC 1960 (M36). Models of terrestrial planet formation indicate that rocky planets
Direct detection of a substellar companion to the young nearby star PZ Telescopii
Aims. We study the formation of substellar objects (exoplanets and brown dwarfs) that are companions to young nearby stars. Methods. With high-contrast AO imaging obtained with NACO at ESO VLT, we
The HOSTS Survey: Evidence for an Extended Dust Disk and Constraints on the Presence of Giant Planets in the Habitable Zone of β Leo
The young (50–400 Myr) A3V star β Leo is a primary target to study the formation history and evolution of extrasolar planetary systems as one of the few stars with known hot (∼1600 K), warm (∼600 K),
Multiwavelength modelling of the β Leo debris disc: one, two or three planetesimal populations?
In this paper we present a model of the β Leo debris disc, with an emphasis on modelling the resolved Photodetector Array Camera and Spectrometer (PACS) images obtained as a part of the Herschel key
Spitzer/IRAC-MIPS Survey of NGC 2451A AND B: Debris Disks at 50-80 Million Years
We present a Spitzer IRAC and MIPS survey of NGC 2451A and B, two open clusters in the 50-80 Myr age range. We complement these data with extensive ground-based photometry and spectroscopy to
The Debris Disk Around HR 8799
We have obtained a full suite of Spitzer observations to characterize the debris disk around HR 8799 and to explore how its properties are related to the recently discovered set of three massive


Mid-infrared images of β Pictoris and the possible role of planetesimal collisions in the central disk
Thermal infrared images of the central disk imply that the brightness asymmetry results from the presence of a bright clump composed of particles that may differ in size from dust elsewhere in the disk, which is suggested to result from the collisional grinding of resonantly trapped planetesimals or the cataclysmic break-up of a planetesimal.
Mid-Infrared Resolution of a 3 AU Radius Debris Disk around ζ Leporis*
We present subarcsecond-resolution mid-infrared images of the debris disk surrounding the 230 Myr old A star ζ Lep. Our data obtained with T-ReCS at Gemini South show the source to be unresolved at
Close stellar encounters with planetesimal discs: the dynamics of asymmetry in the β Pictoris system
We numerically investigate the dynamics of how a close stellar fly-by encounter of a symmetrical circumstellar planetesimal disc can give rise to the many kinds of asymmetries and substructures
Dynamical modeling of large scale asymmetries in the beta Pictoris dust disk
We report a new and complete model of the Pictoris disk, which succeeds in accounting for both the surface brightness distribution, warp characteristics, the outer \butterfly" asymmetry as observed
Deep 10 and 18 Micron Imaging of the HR 4796A Circumstellar Disk: Transient Dust Particles and Tentative Evidence for a Brightness Asymmetry
We present new 10.8 and 18.2 km images of HR 4796A, a young A0 V star that was recently dis- covered to have a spectacular, nearly edge-on, circumstellar disk prominent at D20 km (Jayawardhana and
High-resolution imaging of the dust disk around 49 Ceti
Subarcsecond scale Keck images of the young A1 V star, 49 Ceti, resolve emission at λ = 12.5 and 17.9 μm from a disk with long axis at position angle (P.A.) 125° ± 10° and inclination ф = 60° ± 15°.
Evolution of Debris Disks
Circumstellar dust exists around several hundred main sequence stars. For the youngest stars, that dust could be a remnant of the protoplanetary disk. Mostly it is inferred to be continuously
Long-Term Collisional Evolution of Debris Disks
IR surveys indicate that the dust content in debris disks gradually declines with stellar age. We simulated the long-term collisional depletion of debris disks around solar-type (G2 V) stars with our
The spatial structure of the beta Pictoris gas disk
We have used VLT/UVES to spatially resolve the gas disk of β Pictoris. 88 extended emission lines are observed, with the brightest coming from Fe I, Na I and Ca II. The extent of the gas disk is much
The nature of mid-infrared excesses from hot dust around Sun-like stars
Aims. Studies of the debris disk phenomenon have shown that most systems are analogous to the Edgeworth-Kuiper Belt (EKB). However a rare subset of sun-like stars possess dust which lies, in