2009A&A...493..299S


Query : 2009A&A...493..299S

2009A&A...493..299S - Astronomy and Astrophysics, volume 493, 299-308 (2009/1-1)

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

SMITH R., CHURCHER L.J., WYATT M.C., MOERCHEN M.M. and TELESCO C.M.

Abstract (from CDS):

Sixty percent of the A star members of the 12Myr old β Pictoris moving group (BPMG) show significant excess emission in the mid-infrared, several million years after the proto-planetary disc is thought to disperse. Theoretical models suggest this peak may coincide with the formation of Pluto-sized planetesimals in the disc, stirring smaller bodies into collisional destruction. Here we present resolved mid-infrared imaging of the disc of η Tel (A0V in the BPMG) and consider its implications for the state of planet formation in this system. The source was observed at 11.7 and 18.3µm using T-ReCS on Gemini South. The resulting images were compared to simple disc models to constrain the radial distribution of the emitting material. The emission observed at 18.3µm is shown to be significantly extended beyond the PSF along a position angle 8°. This is the first time dust emission has been resolved around η Tel. Modelling indicates that the extension arises from an edge-on disc of radius 0.5arcsec (∼24AU). Combining the spatial constraints from the imaging with those from the spectral energy distribution shows that >50% of the 18µm emission comes from an unresolved dust component at ∼4AU. The radial structure of the η Tel debris disc is reminiscent of the Solar System, suggesting that this is a young Solar System analogue. For an age of 12Myr, both the radius and dust level of the extended cooler component are consistent with self-stirring models for a protoplanetary disc of 0.7 times minimum mass solar nebula. The origin of the hot dust component may arise in an asteroid belt undergoing collisional destruction or in massive collisions in ongoing terrestrial planet formation.

Abstract Copyright:

Journal keyword(s): circumstellar matter - infrared: stars - planetary systems - stars: individual: η Telescopii

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 * 49 Cet PM* 01 34 37.7786780856 -15 40 34.898673000   5.667 5.607   5.54 A1V 279 0
2 HD 32297 * 05 02 27.4358754192 +07 27 39.678553260   8.32 8.14     A0V 179 0
3 * zet Lep * 05 46 57.3409587 -14 49 19.019943   3.637 3.525     A2IV-V(n) 292 0
4 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1814 1
5 HD 69830 PM* 08 18 23.9469682407 -12 37 55.817187530   6.74 5.95     G8:V 506 1
6 HD 109573 PM* 12 36 01.0317461592 -39 52 10.220465388   5.786 5.774 7.25 5.81 A0V 603 1
7 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 710 0
8 HD 141596 * 15 50 36.1700873976 -20 03 31.934149344   11.73 11.27     G0 5 0
9 HD 172555 PM* 18 45 26.9009806435 -64 52 16.534807985   4.967 4.767     A7V 263 0
10 HD 179886 ** 19 16 21.7421653176 -45 27 57.704061060   6.721 5.371     K3III 24 0
11 * eta Tel PM* 19 22 51.2060774616 -54 25 26.145617376   5.035 5.020   4.99 A0V 208 0
12 * alf Ind PM* 20 37 34.0320077 -47 17 29.402601 4.90 4.11 3.11     K0III-IV 129 0

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2023.02.01-20:28:26

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