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The first science results from SPHERE : disproving the predicted brown dwarf around V471 TAU
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Hardy, A., Schreiber, M. R., Parsons, S. G., Caceres, C., Retamales, G., Wahhaj, Z., Mawet, D., Canovas, H., Cieza, L., Marsh, Tom, Bours, Madelon C. P., Dhillon, V. S. and Bayo, A. (2015) The first science results from SPHERE : disproving the predicted brown dwarf around V471 TAU. The Astrophysical Journal, 800 (2). L24. doi:10.1088/2041-8205/800/2/L24 ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.1088/2041-8205/800/2/L24
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 ${\Delta }{{m}_{H}}=12.1$ 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.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
| Journal or Publication Title: | The Astrophysical Journal | ||||||||
| Publisher: | Institute of Physics Publishing, Inc. | ||||||||
| ISSN: | 0004-637X | ||||||||
| Official Date: | 18 February 2015 | ||||||||
| Dates: |
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| Volume: | 800 | ||||||||
| Number: | 2 | ||||||||
| Article Number: | L24 | ||||||||
| DOI: | 10.1088/2041-8205/800/2/L24 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access |
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