Radio sky within the 30 MHz–43 MHz (left) and 47 MHz–78 MHz bands (proper); zenith is
on the heart of the photographs. Sturdy sources are labeled, notably together with Jupiter and the Solar. In
the decrease frequency picture, Jupiter is of comparable brightness to the Solar, illustrating that the starplanet depth ratio may be of order unity at radio wavelengths. Within the greater frequency picture, the
absence of Jupiter is according to the exceptionally robust cutoff of cyclotron maser emission
the place the native plasma frequency exceeds the native cyclotron frequency throughout the planet’s magnetosphere. (Pictures courtesy of M. Anderson)
Detection of radio emission from Jupiter was recognized rapidly as being because of its planetary-scale magnetic discipline. Subsequent spacecraft investigations have revealed that lots of the planets, and even some moons, both have or have had large-scale magnetic fields.
Within the case of the Earth, Jupiter, Saturn, Uranus, and Neptune, the their magnetic fields are generated by dynamo processes inside these planets, and an interplay between the photo voltaic wind and their magnetic fields generates intense radio emission through the electron cyclotron maser instability. Within the case of Jupiter, its magnetic discipline interacts with the moon Io to end in radio emission as properly.
Extrasolar planets fairly could also be anticipated to generate large-scale magnetic fields and to maintain an electron cyclotron maser instability. Not solely could these radio emissions be a way for locating extrasolar planets, as a result of magnetic fields are tied to the properties of planetary interiors, radio emissions could also be a distant sensing technique of constraining extrasolar planetary properties that will probably be in any other case tough to entry.
Within the case of terrestrial planets, the presence or absence of a magnetic discipline could also be an indicator for habitability. For the reason that first version of the Handbook, there have been a variety of advances, albeit there stay no unambigous detection of radio emission from extrasolar planets. New ground-based telescopes and new potentialities for space-based telescopes present promise for the long run.
T. Joseph W. Lazio (Jet Propulsion Laboratory, California Institute of Expertise)
Feedback: To be revealed in: Handbook of Exoplanets, 2nd Version, Hans Deeg and Juan Antonio Belmonte (Eds. in Chief), Springer Worldwide Publishing AG, a part of Springer Nature. Tips to missed literature welcome
Topics: Earth and Planetary Astrophysics (astro-ph.EP); Instrumentation and Strategies for Astrophysics (astro-ph.IM); Geophysics (physics.geo-ph); Area Physics (physics.space-ph)
Cite as: arXiv:2404.12348 [astro-ph.EP] (or arXiv:2404.12348v1 [astro-ph.EP] for this model)
Submission historical past
From: Joseph Lazio
[v1] Thu, 18 Apr 2024 17:24:56 UTC (2,628 KB)
https://arxiv.org/abs/2404.12348
Astrobiology
