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ALMA and Herschel observations of the prototype dusty and polluted white dwarf G29-38

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Date
21/10/2014
Author
Farihi, J.
Wyatt, M. C.
Greaves, J. S.
Bonsor, A.
Sibthorpe, B.
Panic, O.
Funder
Science & Technology Facilities Council
Grant ID
ST/J001651/1
Keywords
Stars: abundances
Circumstellar matter
Stars: individual: (G29-38)
Planetary systems
White dwarfs
Extrasolar minor planets
Poynting-Robertson drag
Gaseous debris disc
Final mass relation
Collisional evolution
Rocky planetesimals
Brown dwarf
DZ stars
MU-M
Accretion
QB Astronomy
QC Physics
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Abstract
ALMA Cycle 0 and Herschel PACS observations are reported for the prototype, nearest, and brightest example of a dusty and polluted white dwarf, G29-38. These long-wavelength programmes attempted to detect an outlying, parent population of bodies at 1–100 au, from which originates the disrupted planetesimal debris that is observed within 0.01 au and which exhibits LIR/L* = 0.039. No associated emission sources were detected in any of the data down to LIR/L* ∼ 10−4, generally ruling out cold dust masses greater than 1024–1025 g for reasonable grain sizes and properties in orbital regions corresponding to evolved versions of both asteroid and Kuiper belt analogues. Overall, these null detections are consistent with models of long-term collisional evolution in planetesimal discs, and the source regions for the disrupted parent bodies at stars like G29-38 may only be salient in exceptional circumstances, such as a recent instability. A larger sample of polluted white dwarfs, targeted with the full ALMA array, has the potential to unambiguously identify the parent source(s) of their planetary debris.
Citation
Farihi , J , Wyatt , M C , Greaves , J S , Bonsor , A , Sibthorpe , B & Panic , O 2014 , ' ALMA and Herschel observations of the prototype dusty and polluted white dwarf G29-38 ' , Monthly Notices of the Royal Astronomical Society , vol. 444 , no. 2 , pp. 1821-1828 . https://doi.org/10.1093/mnras/stu1545
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/stu1545
ISSN
0035-8711
Type
Journal article
Rights
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Authors, Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Description
JF gratefully acknowledges the support of the STFC via an Ernest Rutherford Fellowship. AB acknowledges the support of the ANR-2010 BLAN-0505-01 (EXOZODI). MCW and OP are grateful for the support of the European Union through ERC grant number 279973.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/5889

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