The first science results from sphere: Disproving the predicted brown dwarf around V471 TAU

A. Hardy, M. R. Schreiber, S. G. Parsons, C. Caceres, G. Retamales, Z. Wahhaj, D. Mawet, H. Canovas, L. Cieza, T. R. Marsh, M. C P Bours, V. S. Dhillon, A. Bayo

Resultado de la investigación: Article

19 Citas (Scopus)

Resumen

Variations of eclipse arrival times have recently been detected in several post-common envelope binaries consisting of a white dwarf and a main-sequence companion star. The generally favored explanation for these timing variations is the gravitational pull of one or more circumbinary substellar objects periodically moving the center of mass of the host binary. Using the new extreme-AO instrument SPHERE, we image the prototype eclipsing post-common envelope binary V471 Tau in search of the brown dwarf that is believed to be responsible for variations in its eclipse arrival times. We report that an unprecedented contrast of δmH = 12.1 at a separation of 260 mas was achieved, but resulted in a non-detection. This implies that there is no brown dwarf present in the system unless it is 3 mag fainter than predicted by evolutionary track models, and provides damaging evidence against the circumbinary interpretation of eclipse timing variations. In the case of V471 Tau, a more consistent explanation is offered with the Applegate mechanism, in which these variations are prescribed to changes in the quadrupole moment within the main-sequence star.

Idioma originalEnglish
Número de artículoL24
PublicaciónAstrophysical Journal Letters
Volumen800
N.º2
DOI
EstadoPublished - 20 feb 2015

Huella dactilar

arrival time
eclipses
main sequence stars
arrivals
envelopes
time measurement
companion stars
center of mass
quadrupoles
prototypes
science
moments

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Hardy, A. ; Schreiber, M. R. ; Parsons, S. G. ; Caceres, C. ; Retamales, G. ; Wahhaj, Z. ; Mawet, D. ; Canovas, H. ; Cieza, L. ; Marsh, T. R. ; Bours, M. C P ; Dhillon, V. S. ; Bayo, A. / The first science results from sphere : Disproving the predicted brown dwarf around V471 TAU. En: Astrophysical Journal Letters. 2015 ; Vol. 800, N.º 2.
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abstract = "Variations of eclipse arrival times have recently been detected in several post-common envelope binaries consisting of a white dwarf and a main-sequence companion star. The generally favored explanation for these timing variations is the gravitational pull of one or more circumbinary substellar objects periodically moving the center of mass of the host binary. Using the new extreme-AO instrument SPHERE, we image the prototype eclipsing post-common envelope binary V471 Tau in search of the brown dwarf that is believed to be responsible for variations in its eclipse arrival times. We report that an unprecedented contrast of δmH = 12.1 at a separation of 260 mas was achieved, but resulted in a non-detection. This implies that there is no brown dwarf present in the system unless it is 3 mag fainter than predicted by evolutionary track models, and provides damaging evidence against the circumbinary interpretation of eclipse timing variations. In the case of V471 Tau, a more consistent explanation is offered with the Applegate mechanism, in which these variations are prescribed to changes in the quadrupole moment within the main-sequence star.",
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Hardy, A, Schreiber, MR, Parsons, SG, Caceres, C, Retamales, G, Wahhaj, Z, Mawet, D, Canovas, H, Cieza, L, Marsh, TR, Bours, MCP, Dhillon, VS & Bayo, A 2015, 'The first science results from sphere: Disproving the predicted brown dwarf around V471 TAU', Astrophysical Journal Letters, vol. 800, n.º 2, L24. https://doi.org/10.1088/2041-8205/800/2/L24

The first science results from sphere : Disproving the predicted brown dwarf around V471 TAU. / Hardy, A.; Schreiber, M. R.; Parsons, S. G.; Caceres, C.; Retamales, G.; Wahhaj, Z.; Mawet, D.; Canovas, H.; Cieza, L.; Marsh, T. R.; Bours, M. C P; Dhillon, V. S.; Bayo, A.

En: Astrophysical Journal Letters, Vol. 800, N.º 2, L24, 20.02.2015.

Resultado de la investigación: Article

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AU - Schreiber, M. R.

AU - Parsons, S. G.

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AU - Retamales, G.

AU - Wahhaj, Z.

AU - Mawet, D.

AU - Canovas, H.

AU - Cieza, L.

AU - Marsh, T. R.

AU - Bours, M. C P

AU - Dhillon, V. S.

AU - Bayo, A.

PY - 2015/2/20

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N2 - Variations of eclipse arrival times have recently been detected in several post-common envelope binaries consisting of a white dwarf and a main-sequence companion star. The generally favored explanation for these timing variations is the gravitational pull of one or more circumbinary substellar objects periodically moving the center of mass of the host binary. Using the new extreme-AO instrument SPHERE, we image the prototype eclipsing post-common envelope binary V471 Tau in search of the brown dwarf that is believed to be responsible for variations in its eclipse arrival times. We report that an unprecedented contrast of δmH = 12.1 at a separation of 260 mas was achieved, but resulted in a non-detection. This implies that there is no brown dwarf present in the system unless it is 3 mag fainter than predicted by evolutionary track models, and provides damaging evidence against the circumbinary interpretation of eclipse timing variations. In the case of V471 Tau, a more consistent explanation is offered with the Applegate mechanism, in which these variations are prescribed to changes in the quadrupole moment within the main-sequence star.

AB - Variations of eclipse arrival times have recently been detected in several post-common envelope binaries consisting of a white dwarf and a main-sequence companion star. The generally favored explanation for these timing variations is the gravitational pull of one or more circumbinary substellar objects periodically moving the center of mass of the host binary. Using the new extreme-AO instrument SPHERE, we image the prototype eclipsing post-common envelope binary V471 Tau in search of the brown dwarf that is believed to be responsible for variations in its eclipse arrival times. We report that an unprecedented contrast of δmH = 12.1 at a separation of 260 mas was achieved, but resulted in a non-detection. This implies that there is no brown dwarf present in the system unless it is 3 mag fainter than predicted by evolutionary track models, and provides damaging evidence against the circumbinary interpretation of eclipse timing variations. In the case of V471 Tau, a more consistent explanation is offered with the Applegate mechanism, in which these variations are prescribed to changes in the quadrupole moment within the main-sequence star.

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KW - planetstar interactions

KW - stars: individual (V471 Tau)

KW - white dwarfs

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