Images of the extended outer regions of the debris ring around HR 4796 A

C. Thalmann, M. Janson, E. Buenzli, T. D. Brandt, J. P. Wisniewski, A. Moro-Martín, T. Usuda, G. Schneider, J. Carson, M. W. McElwain, C. A. Grady, M. Goto, L. Abe, W. Brandner, C. Dominik, S. Egner, M. Feldt, T. Fukue, T. Golota, Olivier GuyonJ. Hashimoto, Y. Hayano, M. Hayashi, S. Hayashi, T. Henning, K. W. Hodapp, M. Ishii, M. Iye, R. Kandori, G. R. Knapp, T. Kudo, N. Kusakabe, M. Kuzuhara, T. Matsuo, S. Miyama, J. I. Morino, T. Nishimura, T. S. Pyo, E. Serabyn, H. Suto, R. Suzuki, Y. H. Takahashi, M. Takami, N. Takato, H. Terada, D. Tomono, E. L. Turner, M. Watanabe, T. Yamada, H. Takami, M. Tamura

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

We present high-contrast images of HR 4796 A taken with Subaru/HiCIAO in the H band, resolving the debris disk in scattered light. The application of specialized angular differential imaging methods allows us to trace the inner edge of the disk with high precision and reveals a pair of "streamers" extending radially outward from the ansae. Using a simple disk model with a power-law surface brightness profile, we demonstrate that the observed streamers can be understood as part of the smoothly tapered outer boundary of the debris disk, which is most visible at the ansae. Our observations are consistent with the expected result of a narrow planetesimal ring being ground up in a collisional cascade, yielding dust with a wide range of grain sizes. Radiation forces leave large grains in the ring and push smaller grains onto elliptical or even hyperbolic trajectories. We measure and characterize the disk's surface brightness profile, and confirm the previously suspected offset of the disk's center from the star's position along the ring's major axis. Furthermore, we present first evidence for an offset along the minor axis. Such offsets are commonly viewed as signposts for the presence of unseen planets within a disk's cavity. Our images also offer new constraints on the presence of companions down to the planetary mass regime (∼9 M Jup at 0″.5, ∼3M Jup at 1″).

Original languageEnglish (US)
Article numberL6
JournalAstrophysical Journal Letters
Volume743
Issue number1
DOIs
StatePublished - Dec 10 2011
Externally publishedYes

Fingerprint

debris
imaging method
planetesimal
rings
cavity
power law
planet
grain size
trajectory
dust
hyperbolic trajectories
brightness
planetary mass
protoplanets
image contrast
profiles
planets
cascades
stars
cavities

Keywords

  • circumstellar matter
  • planetary systems
  • stars: individual (HR 4796 A)
  • techniques: high angular resolution

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Thalmann, C., Janson, M., Buenzli, E., Brandt, T. D., Wisniewski, J. P., Moro-Martín, A., ... Tamura, M. (2011). Images of the extended outer regions of the debris ring around HR 4796 A. Astrophysical Journal Letters, 743(1), [L6]. https://doi.org/10.1088/2041-8205/743/1/L6

Images of the extended outer regions of the debris ring around HR 4796 A. / Thalmann, C.; Janson, M.; Buenzli, E.; Brandt, T. D.; Wisniewski, J. P.; Moro-Martín, A.; Usuda, T.; Schneider, G.; Carson, J.; McElwain, M. W.; Grady, C. A.; Goto, M.; Abe, L.; Brandner, W.; Dominik, C.; Egner, S.; Feldt, M.; Fukue, T.; Golota, T.; Guyon, Olivier; Hashimoto, J.; Hayano, Y.; Hayashi, M.; Hayashi, S.; Henning, T.; Hodapp, K. W.; Ishii, M.; Iye, M.; Kandori, R.; Knapp, G. R.; Kudo, T.; Kusakabe, N.; Kuzuhara, M.; Matsuo, T.; Miyama, S.; Morino, J. I.; Nishimura, T.; Pyo, T. S.; Serabyn, E.; Suto, H.; Suzuki, R.; Takahashi, Y. H.; Takami, M.; Takato, N.; Terada, H.; Tomono, D.; Turner, E. L.; Watanabe, M.; Yamada, T.; Takami, H.; Tamura, M.

In: Astrophysical Journal Letters, Vol. 743, No. 1, L6, 10.12.2011.

Research output: Contribution to journalArticle

Thalmann, C, Janson, M, Buenzli, E, Brandt, TD, Wisniewski, JP, Moro-Martín, A, Usuda, T, Schneider, G, Carson, J, McElwain, MW, Grady, CA, Goto, M, Abe, L, Brandner, W, Dominik, C, Egner, S, Feldt, M, Fukue, T, Golota, T, Guyon, O, Hashimoto, J, Hayano, Y, Hayashi, M, Hayashi, S, Henning, T, Hodapp, KW, Ishii, M, Iye, M, Kandori, R, Knapp, GR, Kudo, T, Kusakabe, N, Kuzuhara, M, Matsuo, T, Miyama, S, Morino, JI, Nishimura, T, Pyo, TS, Serabyn, E, Suto, H, Suzuki, R, Takahashi, YH, Takami, M, Takato, N, Terada, H, Tomono, D, Turner, EL, Watanabe, M, Yamada, T, Takami, H & Tamura, M 2011, 'Images of the extended outer regions of the debris ring around HR 4796 A', Astrophysical Journal Letters, vol. 743, no. 1, L6. https://doi.org/10.1088/2041-8205/743/1/L6
Thalmann C, Janson M, Buenzli E, Brandt TD, Wisniewski JP, Moro-Martín A et al. Images of the extended outer regions of the debris ring around HR 4796 A. Astrophysical Journal Letters. 2011 Dec 10;743(1). L6. https://doi.org/10.1088/2041-8205/743/1/L6
Thalmann, C. ; Janson, M. ; Buenzli, E. ; Brandt, T. D. ; Wisniewski, J. P. ; Moro-Martín, A. ; Usuda, T. ; Schneider, G. ; Carson, J. ; McElwain, M. W. ; Grady, C. A. ; Goto, M. ; Abe, L. ; Brandner, W. ; Dominik, C. ; Egner, S. ; Feldt, M. ; Fukue, T. ; Golota, T. ; Guyon, Olivier ; Hashimoto, J. ; Hayano, Y. ; Hayashi, M. ; Hayashi, S. ; Henning, T. ; Hodapp, K. W. ; Ishii, M. ; Iye, M. ; Kandori, R. ; Knapp, G. R. ; Kudo, T. ; Kusakabe, N. ; Kuzuhara, M. ; Matsuo, T. ; Miyama, S. ; Morino, J. I. ; Nishimura, T. ; Pyo, T. S. ; Serabyn, E. ; Suto, H. ; Suzuki, R. ; Takahashi, Y. H. ; Takami, M. ; Takato, N. ; Terada, H. ; Tomono, D. ; Turner, E. L. ; Watanabe, M. ; Yamada, T. ; Takami, H. ; Tamura, M. / Images of the extended outer regions of the debris ring around HR 4796 A. In: Astrophysical Journal Letters. 2011 ; Vol. 743, No. 1.
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abstract = "We present high-contrast images of HR 4796 A taken with Subaru/HiCIAO in the H band, resolving the debris disk in scattered light. The application of specialized angular differential imaging methods allows us to trace the inner edge of the disk with high precision and reveals a pair of {"}streamers{"} extending radially outward from the ansae. Using a simple disk model with a power-law surface brightness profile, we demonstrate that the observed streamers can be understood as part of the smoothly tapered outer boundary of the debris disk, which is most visible at the ansae. Our observations are consistent with the expected result of a narrow planetesimal ring being ground up in a collisional cascade, yielding dust with a wide range of grain sizes. Radiation forces leave large grains in the ring and push smaller grains onto elliptical or even hyperbolic trajectories. We measure and characterize the disk's surface brightness profile, and confirm the previously suspected offset of the disk's center from the star's position along the ring's major axis. Furthermore, we present first evidence for an offset along the minor axis. Such offsets are commonly viewed as signposts for the presence of unseen planets within a disk's cavity. Our images also offer new constraints on the presence of companions down to the planetary mass regime (∼9 M Jup at 0″.5, ∼3M Jup at 1″).",
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T1 - Images of the extended outer regions of the debris ring around HR 4796 A

AU - Thalmann, C.

AU - Janson, M.

AU - Buenzli, E.

AU - Brandt, T. D.

AU - Wisniewski, J. P.

AU - Moro-Martín, A.

AU - Usuda, T.

AU - Schneider, G.

AU - Carson, J.

AU - McElwain, M. W.

AU - Grady, C. A.

AU - Goto, M.

AU - Abe, L.

AU - Brandner, W.

AU - Dominik, C.

AU - Egner, S.

AU - Feldt, M.

AU - Fukue, T.

AU - Golota, T.

AU - Guyon, Olivier

AU - Hashimoto, J.

AU - Hayano, Y.

AU - Hayashi, M.

AU - Hayashi, S.

AU - Henning, T.

AU - Hodapp, K. W.

AU - Ishii, M.

AU - Iye, M.

AU - Kandori, R.

AU - Knapp, G. R.

AU - Kudo, T.

AU - Kusakabe, N.

AU - Kuzuhara, M.

AU - Matsuo, T.

AU - Miyama, S.

AU - Morino, J. I.

AU - Nishimura, T.

AU - Pyo, T. S.

AU - Serabyn, E.

AU - Suto, H.

AU - Suzuki, R.

AU - Takahashi, Y. H.

AU - Takami, M.

AU - Takato, N.

AU - Terada, H.

AU - Tomono, D.

AU - Turner, E. L.

AU - Watanabe, M.

AU - Yamada, T.

AU - Takami, H.

AU - Tamura, M.

PY - 2011/12/10

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N2 - We present high-contrast images of HR 4796 A taken with Subaru/HiCIAO in the H band, resolving the debris disk in scattered light. The application of specialized angular differential imaging methods allows us to trace the inner edge of the disk with high precision and reveals a pair of "streamers" extending radially outward from the ansae. Using a simple disk model with a power-law surface brightness profile, we demonstrate that the observed streamers can be understood as part of the smoothly tapered outer boundary of the debris disk, which is most visible at the ansae. Our observations are consistent with the expected result of a narrow planetesimal ring being ground up in a collisional cascade, yielding dust with a wide range of grain sizes. Radiation forces leave large grains in the ring and push smaller grains onto elliptical or even hyperbolic trajectories. We measure and characterize the disk's surface brightness profile, and confirm the previously suspected offset of the disk's center from the star's position along the ring's major axis. Furthermore, we present first evidence for an offset along the minor axis. Such offsets are commonly viewed as signposts for the presence of unseen planets within a disk's cavity. Our images also offer new constraints on the presence of companions down to the planetary mass regime (∼9 M Jup at 0″.5, ∼3M Jup at 1″).

AB - We present high-contrast images of HR 4796 A taken with Subaru/HiCIAO in the H band, resolving the debris disk in scattered light. The application of specialized angular differential imaging methods allows us to trace the inner edge of the disk with high precision and reveals a pair of "streamers" extending radially outward from the ansae. Using a simple disk model with a power-law surface brightness profile, we demonstrate that the observed streamers can be understood as part of the smoothly tapered outer boundary of the debris disk, which is most visible at the ansae. Our observations are consistent with the expected result of a narrow planetesimal ring being ground up in a collisional cascade, yielding dust with a wide range of grain sizes. Radiation forces leave large grains in the ring and push smaller grains onto elliptical or even hyperbolic trajectories. We measure and characterize the disk's surface brightness profile, and confirm the previously suspected offset of the disk's center from the star's position along the ring's major axis. Furthermore, we present first evidence for an offset along the minor axis. Such offsets are commonly viewed as signposts for the presence of unseen planets within a disk's cavity. Our images also offer new constraints on the presence of companions down to the planetary mass regime (∼9 M Jup at 0″.5, ∼3M Jup at 1″).

KW - circumstellar matter

KW - planetary systems

KW - stars: individual (HR 4796 A)

KW - techniques: high angular resolution

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