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Title: Limits on low-frequency radio emission from southern exoplanets with the Murchison widefield array
Authors: Murphy, Tara
Deshpande, A.A.
Prabu, T.
Udaya Shankar, N.
Srivani, K.S.
Subrahmanyan, Ravi
+25 Co-authors
Keywords: radio continuum
planetary systems
Issue Date: 21-Jan-2015
Citation: Monthly Notices of the Royal Astronomical Society, 2015, Vol. 446, p2560-2565
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.
Description: Open Access
ISSN: 0035-8711
1365-2966 - (online)
Alternative Location:
Copyright: 2014 The authors & the Royal Astronomical Society
Appears in Collections:Research Papers (A&A)

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