SETI bioastro: Predicting low-frequency radio fluxes of known extrasolar planets

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Predicting low-frequency radio fluxes of known extrasolar planets

Authors: J.-M. Grießmeier (1), P. Zarka (1), H. Spreeuw (2) ((1) LESIA,
Observatoire de Paris, Meudon, France, (2) Astronomical Institute ”Anton
Pannekoek”, Amsterdam, The Netherlands)

(Submitted on 2 Jun 2008)

Abstract: Context. Close-in giant extrasolar planets (”Hot Jupiters”) are
believed to be strong emitters in the decametric radio range.

Aims. We present the expected characteristics of the low-frequency
magnetospheric radio emission of all currently known extrasolar planets,
including the maximum emission frequency and the expected radio flux. We
also discuss the escape of exoplanetary radio emission from the vicinity of
its source, which imposes additional constraints on detectability.

Methods. We compare the different predictions obtained with all four
existing analytical models for all currently known exoplanets. We also take
care to use realistic values for all input parameters.

Results. The four different models for planetary radio emission lead to very
different results. The largest fluxes are found for the magnetic energy
model, followed by the CME model and the kinetic energy model (for which our
results are found to be much less optimistic than those of previous
studies). The unipolar interaction model does not predict any observable
emission for the present exoplanet census. We also give estimates for the
planetary magnetic dipole moment of all currently known extrasolar planets,
which will be useful for other studies.

Conclusions. Our results show that observations of exoplanetary radio
emission are feasible, but that the number of promising targets is not very
high. The catalog of targets will be particularly useful for current and
future radio observation campaigns (e.g. with the VLA, GMRT, UTR-2 and with
LOFAR).

Comments: 4 figures; Table 1 is available in electronic form at the CDS via
anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via this http URL

Subjects: Astrophysics (astro-ph)

Journal reference: A&A 475, 359-368 (2007)

DOI: 10.1051/0004-6361:20077397

Cite as: arXiv:0806.0327v1 [astro-ph]

Submission history

From: Jean-Mathias Grie{\ss}meier [view email]

[v1] Mon, 2 Jun 2008 17:26:55 GMT (73kb)

http://arxiv.org/abs/0806.0327

• Previous message: LARRY KLAES: "SETI bioastro: An article on the Allen Telescope Array (ATA) from the Los Angeles Times"

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