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Limits on low-frequency radio emission from southern exoplanets with the Murchison Widefield Array

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Authors
Murphy, T.
Bell, M.
Kaplan, D.
Gaensler, B.
Offringa, A.
Lenc, E.
Hurley-Walker, N.
Bernardi, G.
Bowman, J.
Briggs, F.
Cappallo, R.
Corey, B.
Deshpande, A.
Emrich, D.
Goeke, R.
Greenhill, L.
Hazelton, B.
Hewitt, J.
Johnston-Hollitt, M.
Kasper, J.
Kratzenberg, E.
Lonsdale, C.
Lynch, Mervyn
McWhirter, S.
Mitchell, D.
Morales, M.
Morgan, E.
Oberoi, D.
Ord, Stephen
Prabu, T.
Rogers, A.
Roshi, D.
Shankar, N.
Srivani, K.
Subrahmanyan, R.
Tingay, Steven
Waterson, M.
Wayth, Randall
Webster, R.
Whitney, A.
Williams, A.
Williams, C.
Date
2015
Type
Journal Article

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Murphy, T. and Bell, M. and Kaplan, D. and Gaensler, B. and Offringa, A. and Lenc, E. and Hurley-Walker, N. et al. 2015. Limits on low-frequency radio emission from southern exoplanets with the Murchison Widefield Array. Monthly Notices of the Royal Astronomical Society. 446 (3): pp. 2560-2565.
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MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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Department of Physics and Astronomy
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This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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Abstract

We present the results of a survey for low-frequency radio emission from 17 known exoplanetary systems with the Murchison Widefield Array. This sample includes 13 systems that have not previously been targeted with radio observations. We detected no radio emission at 154 MHz, and put 3σ upper limits in the range 15.2–112.5 mJy on this emission. We also searched for circularly polarized emission and made no detections, obtaining 3σ upper limits in the range 3.4–49.9 mJy. These are comparable with the best low-frequency radio limits in the existing literature and translate to luminosity limits of between 1.2 × 1014 and 1.4 × 1017 W if the emission is assumed to be 100 per cent circularly polarized. These are the first results from a larger program to systematically search for exoplanetary emission with the MWA.