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

J. Farihi; M. C. Wyatt; J. S. Greaves; A. Bonsor; B. Sibthorpe; O. Panic

doi:10.1093/mnras/stu1545

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

J. Farihi^*, M. C. Wyatt, J. S. Greaves, A. Bonsor, B. Sibthorpe, O. Panic

^*Corresponding author for this work

School of Physics and Astronomy

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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 L_IR/L_* = 0.039. No associated emission sources were detected in any of the data down to L_IR/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.

Original language	English
Pages (from-to)	1821-1828
Number of pages	8
Journal	Monthly Notices of the Royal Astronomical Society
Volume	444
Issue number	2
Early online date	2 Sept 2014
DOIs	https://doi.org/10.1093/mnras/stu1545
Publication status	Published - 21 Oct 2014

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

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10.1093/mnras/stu1545

Greaves_2014_MNRAS_ALMAWhiteDwarf
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.
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Astrophysics at St Andrews:2012 - 2014: Astrophysics at St Andrews: 2012 - 2014
Horne, K. D. (PI)
Science & Technology Facilities Council
1/10/11 → 31/03/12
Project: Standard

Cite this

@article{112d0d38a76d4ae990c384b1fce283fe,

title = "ALMA and Herschel observations of the prototype dusty and polluted white dwarf G29-38",

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. ",

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",

author = "J. Farihi and Wyatt, {M. C.} and Greaves, {J. S.} and A. Bonsor and B. Sibthorpe and O. Panic",

note = "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. ",

year = "2014",

month = oct,

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doi = "10.1093/mnras/stu1545",

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pages = "1821--1828",

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T1 - ALMA and Herschel observations of the prototype dusty and polluted white dwarf G29-38

AU - Farihi, J.

AU - Wyatt, M. C.

AU - Greaves, J. S.

AU - Bonsor, A.

AU - Sibthorpe, B.

AU - Panic, O.

N1 - 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.

PY - 2014/10/21

Y1 - 2014/10/21

N2 - 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.

AB - 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.

KW - Stars: abundances

KW - Circumstellar matter

KW - Stars: individual: (G29-38)

KW - Planetary systems

KW - White dwarfs

KW - Extrasolar minor planets

KW - Poynting-Robertson drag

KW - Gaseous debris disc

KW - Final mass relation

KW - Collisional evolution

KW - Rocky planetesimals

KW - Brown dwarf

KW - DZ stars

KW - MU-M

KW - Accretion

U2 - 10.1093/mnras/stu1545

DO - 10.1093/mnras/stu1545

M3 - Article

SN - 0035-8711

VL - 444

SP - 1821

EP - 1828

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

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

Abstract

Keywords

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Projects

Astrophysics at St Andrews:2012 - 2014: Astrophysics at St Andrews: 2012 - 2014

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