DZ Chamaeleontis: A bona fide photoevaporating disc

H. Canovas, B. Montesinos, M. R. Schreiber, L. A. Cieza, C. Eiroa, G. Meeus, J. De Boer, F. Ménard, Z. Wahhaj, P. Riviere-Marichalar, J. Olofsson, A. Garufi, I. Rebollido, R. G. Van Holstein, C. Caceres, A. Hardy, E. Villaver

Resultado de la investigación: Article

10 Citas (Scopus)

Resumen

Context. DZ Cha is a weak-lined T Tauri star (WTTS) surrounded by a bright protoplanetary disc with evidence of inner disc clearing. Its narrow Hα line and infrared spectral energy distribution suggest that DZ Cha may be a photoevaporating disc. Aims. We aim to analyse the DZ Cha star + disc system to identify the mechanism driving the evolution of this object. Methods. We have analysed three epochs of high resolution optical spectroscopy, photometry from the UV up to the sub-mm regime, infrared spectroscopy, and J-band imaging polarimetry observations of DZ Cha. Results. Combining our analysis with previous studies we find no signatures of accretion in the Hα line profile in nine epochs covering a time baseline of ∼20 yr. The optical spectra are dominated by chromospheric emission lines, but they also show emission from the forbidden lines [SII] 4068 and [OI] 6300Å that indicate a disc outflow. The polarized images reveal a dust depleted cavity of ∼7 au in radius and two spiral-like features, and we derive a disc dust mass limit of Mdust< 3 MEarth from the sub-mm photometry. No stellar (M> 80 MJup) companions are detected down to 0″.07 (∼8 au, projected). Conclusions. The negligible accretion rate, small cavity, and forbidden line emission strongly suggests that DZ Cha is currently at the initial stages of disc clearing by photoevaporation. At this point the inner disc has drained and the inner wall of the truncated outer disc is directly exposed to the stellar radiation. We argue that other mechanisms like planet formation or binarity cannot explain the observed properties of DZ Cha. The scarcity of objects like this one is in line with the dispersal timescale (≲105 yr) predicted by this theory. DZ Cha is therefore an ideal target to study the initial stages of photoevaporation.

Idioma originalEnglish
Número de artículoA13
PublicaciónAstronomy and Astrophysics
Volumen610
DOI
EstadoPublished - 1 feb 2018

Huella dactilar

cavity
accretion
dust
H lines
infrared spectroscopy
clearing
outflow
planet
spectroscopy
timescale
time measurement
stellar radiation
cavities
protoplanetary disks
T Tauri stars
energy
polarimetry
spectral energy distribution
photometry
optical spectrum

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Canovas, H., Montesinos, B., Schreiber, M. R., Cieza, L. A., Eiroa, C., Meeus, G., ... Villaver, E. (2018). DZ Chamaeleontis: A bona fide photoevaporating disc. Astronomy and Astrophysics, 610, [A13]. https://doi.org/10.1051/0004-6361/201731640
Canovas, H. ; Montesinos, B. ; Schreiber, M. R. ; Cieza, L. A. ; Eiroa, C. ; Meeus, G. ; De Boer, J. ; Ménard, F. ; Wahhaj, Z. ; Riviere-Marichalar, P. ; Olofsson, J. ; Garufi, A. ; Rebollido, I. ; Van Holstein, R. G. ; Caceres, C. ; Hardy, A. ; Villaver, E. / DZ Chamaeleontis : A bona fide photoevaporating disc. En: Astronomy and Astrophysics. 2018 ; Vol. 610.
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title = "DZ Chamaeleontis: A bona fide photoevaporating disc",
abstract = "Context. DZ Cha is a weak-lined T Tauri star (WTTS) surrounded by a bright protoplanetary disc with evidence of inner disc clearing. Its narrow Hα line and infrared spectral energy distribution suggest that DZ Cha may be a photoevaporating disc. Aims. We aim to analyse the DZ Cha star + disc system to identify the mechanism driving the evolution of this object. Methods. We have analysed three epochs of high resolution optical spectroscopy, photometry from the UV up to the sub-mm regime, infrared spectroscopy, and J-band imaging polarimetry observations of DZ Cha. Results. Combining our analysis with previous studies we find no signatures of accretion in the Hα line profile in nine epochs covering a time baseline of ∼20 yr. The optical spectra are dominated by chromospheric emission lines, but they also show emission from the forbidden lines [SII] 4068 and [OI] 6300{\AA} that indicate a disc outflow. The polarized images reveal a dust depleted cavity of ∼7 au in radius and two spiral-like features, and we derive a disc dust mass limit of Mdust< 3 MEarth from the sub-mm photometry. No stellar (M∗> 80 MJup) companions are detected down to 0″.07 (∼8 au, projected). Conclusions. The negligible accretion rate, small cavity, and forbidden line emission strongly suggests that DZ Cha is currently at the initial stages of disc clearing by photoevaporation. At this point the inner disc has drained and the inner wall of the truncated outer disc is directly exposed to the stellar radiation. We argue that other mechanisms like planet formation or binarity cannot explain the observed properties of DZ Cha. The scarcity of objects like this one is in line with the dispersal timescale (≲105 yr) predicted by this theory. DZ Cha is therefore an ideal target to study the initial stages of photoevaporation.",
keywords = "Accretion, accretion disks, Protoplanetary disks, Stars: variables: T Tauri, Herbig Ae/Be",
author = "H. Canovas and B. Montesinos and Schreiber, {M. R.} and Cieza, {L. A.} and C. Eiroa and G. Meeus and {De Boer}, J. and F. M{\'e}nard and Z. Wahhaj and P. Riviere-Marichalar and J. Olofsson and A. Garufi and I. Rebollido and {Van Holstein}, {R. G.} and C. Caceres and A. Hardy and E. Villaver",
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Canovas, H, Montesinos, B, Schreiber, MR, Cieza, LA, Eiroa, C, Meeus, G, De Boer, J, Ménard, F, Wahhaj, Z, Riviere-Marichalar, P, Olofsson, J, Garufi, A, Rebollido, I, Van Holstein, RG, Caceres, C, Hardy, A & Villaver, E 2018, 'DZ Chamaeleontis: A bona fide photoevaporating disc', Astronomy and Astrophysics, vol. 610, A13. https://doi.org/10.1051/0004-6361/201731640

DZ Chamaeleontis : A bona fide photoevaporating disc. / Canovas, H.; Montesinos, B.; Schreiber, M. R.; Cieza, L. A.; Eiroa, C.; Meeus, G.; De Boer, J.; Ménard, F.; Wahhaj, Z.; Riviere-Marichalar, P.; Olofsson, J.; Garufi, A.; Rebollido, I.; Van Holstein, R. G.; Caceres, C.; Hardy, A.; Villaver, E.

En: Astronomy and Astrophysics, Vol. 610, A13, 01.02.2018.

Resultado de la investigación: Article

TY - JOUR

T1 - DZ Chamaeleontis

T2 - A bona fide photoevaporating disc

AU - Canovas, H.

AU - Montesinos, B.

AU - Schreiber, M. R.

AU - Cieza, L. A.

AU - Eiroa, C.

AU - Meeus, G.

AU - De Boer, J.

AU - Ménard, F.

AU - Wahhaj, Z.

AU - Riviere-Marichalar, P.

AU - Olofsson, J.

AU - Garufi, A.

AU - Rebollido, I.

AU - Van Holstein, R. G.

AU - Caceres, C.

AU - Hardy, A.

AU - Villaver, E.

PY - 2018/2/1

Y1 - 2018/2/1

N2 - Context. DZ Cha is a weak-lined T Tauri star (WTTS) surrounded by a bright protoplanetary disc with evidence of inner disc clearing. Its narrow Hα line and infrared spectral energy distribution suggest that DZ Cha may be a photoevaporating disc. Aims. We aim to analyse the DZ Cha star + disc system to identify the mechanism driving the evolution of this object. Methods. We have analysed three epochs of high resolution optical spectroscopy, photometry from the UV up to the sub-mm regime, infrared spectroscopy, and J-band imaging polarimetry observations of DZ Cha. Results. Combining our analysis with previous studies we find no signatures of accretion in the Hα line profile in nine epochs covering a time baseline of ∼20 yr. The optical spectra are dominated by chromospheric emission lines, but they also show emission from the forbidden lines [SII] 4068 and [OI] 6300Å that indicate a disc outflow. The polarized images reveal a dust depleted cavity of ∼7 au in radius and two spiral-like features, and we derive a disc dust mass limit of Mdust< 3 MEarth from the sub-mm photometry. No stellar (M∗> 80 MJup) companions are detected down to 0″.07 (∼8 au, projected). Conclusions. The negligible accretion rate, small cavity, and forbidden line emission strongly suggests that DZ Cha is currently at the initial stages of disc clearing by photoevaporation. At this point the inner disc has drained and the inner wall of the truncated outer disc is directly exposed to the stellar radiation. We argue that other mechanisms like planet formation or binarity cannot explain the observed properties of DZ Cha. The scarcity of objects like this one is in line with the dispersal timescale (≲105 yr) predicted by this theory. DZ Cha is therefore an ideal target to study the initial stages of photoevaporation.

AB - Context. DZ Cha is a weak-lined T Tauri star (WTTS) surrounded by a bright protoplanetary disc with evidence of inner disc clearing. Its narrow Hα line and infrared spectral energy distribution suggest that DZ Cha may be a photoevaporating disc. Aims. We aim to analyse the DZ Cha star + disc system to identify the mechanism driving the evolution of this object. Methods. We have analysed three epochs of high resolution optical spectroscopy, photometry from the UV up to the sub-mm regime, infrared spectroscopy, and J-band imaging polarimetry observations of DZ Cha. Results. Combining our analysis with previous studies we find no signatures of accretion in the Hα line profile in nine epochs covering a time baseline of ∼20 yr. The optical spectra are dominated by chromospheric emission lines, but they also show emission from the forbidden lines [SII] 4068 and [OI] 6300Å that indicate a disc outflow. The polarized images reveal a dust depleted cavity of ∼7 au in radius and two spiral-like features, and we derive a disc dust mass limit of Mdust< 3 MEarth from the sub-mm photometry. No stellar (M∗> 80 MJup) companions are detected down to 0″.07 (∼8 au, projected). Conclusions. The negligible accretion rate, small cavity, and forbidden line emission strongly suggests that DZ Cha is currently at the initial stages of disc clearing by photoevaporation. At this point the inner disc has drained and the inner wall of the truncated outer disc is directly exposed to the stellar radiation. We argue that other mechanisms like planet formation or binarity cannot explain the observed properties of DZ Cha. The scarcity of objects like this one is in line with the dispersal timescale (≲105 yr) predicted by this theory. DZ Cha is therefore an ideal target to study the initial stages of photoevaporation.

KW - Accretion, accretion disks

KW - Protoplanetary disks

KW - Stars: variables: T Tauri, Herbig Ae/Be

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U2 - 10.1051/0004-6361/201731640

DO - 10.1051/0004-6361/201731640

M3 - Article

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VL - 610

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

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Canovas H, Montesinos B, Schreiber MR, Cieza LA, Eiroa C, Meeus G y otros. DZ Chamaeleontis: A bona fide photoevaporating disc. Astronomy and Astrophysics. 2018 feb 1;610. A13. https://doi.org/10.1051/0004-6361/201731640