Star-Planet Interactions in the Radio Domain: Prospect for Their Detection
All possible types of interaction of a magnetized plasma flow with an obstacle (magnetized or not) are considered, and those susceptible to produce a radio signature are identified. The role of the sub-Alfvénic or super-Alfvénic character of the flow is discussed. Known examples in the solar system are given, as well as extrapolations to star-planet plasma interactions. The dissipated power and the fraction that goes into radio waves are evaluated in the frame of the radio-magnetic scaling law, the theoretical bases and validity of which are discussed in the light of recent works. Then it is shown how radio signatures can be interpreted, in the frame of the cyclotron-maser theory (developed for explaining the generation of solar system planetary auroral and satellite-induced radio emissions), for deducing many physical parameters of the system studied, including the planetary or stellar magnetic field. Prospects for the detection of such radio signatures with new generation low-frequency radiotelescopes are then outlined.
PZ acknowledges funding from the programs PNP, PNST, PNPS, and AS SKA-LOFAR of CNRS/INSU.
- Bagenal F (2001) Planetary magnetospheres. In: Murdin P (ed) Encyclopedia of astronomy and astrophysics. IOP Publishing, Bristol. article 2329Google Scholar
- Encrenaz T, Bibring JP, Blanc M et al (2004) The solar system, 3rd edn. A&A Library, Springer, Berlin. http://www.springer.com/in/book/9783540002413
- Kivelson MG, Bagenal F, Kurth WS et al (2004) Magnetospheric interactions with satellites. In: Bagenal F, McKinnon W, Dowling T (eds) Jupiter: the planet, satellites, and magnetosphere. Cambridge University Press, Cambridge, pp 513–536Google Scholar
- Lepping RP (1986) Magnetic configuration of planetary obstacles. In: Comparative study of magnetospheric systems. Cepadues/CNES ed, Toulouse, pp 45–75Google Scholar
- Louis CK, Lamy L, Zarka P, Cecconi B, Hess SLG (2017) Detection of Jupiter decametric emissions controlled by Europa and Ganymede with Voyager/PRA and Cassini/RPWS. J Geophys Res (in press)Google Scholar
- Zarka P (2006) Hot jupiters and magnetized stars: giant analogs of the satellite-jupiter system? In: Rucker HO, Kurth WS, Mann G (eds) Planetary radio emissions VI. Austrian Academy of Science Press, Vienna, pp 543–569Google Scholar
- Zarka P (2010) Radioastronomy and the study of exoplanets. In: Coudé du Foresto V, Gelino DM, Ribas I (eds) Pathways towards habitable planets, ASP conference series, vol 430. Astronomical Society of the Pacific, San Francisco, pp 175–180Google Scholar
- Zarka P, Lazio TJW, Hallinan G (2015) Magnetospheric radio emissions from exoplanets with the SKA. In: Advancing astrophysics with the square kilometre array, Giardini Naxos. SKA Organisation (Dolman Scott Ltd), Jodrell Bank Observatory, MacclesfieldGoogle Scholar
- Zarka P, Marques M, Louis C et al (2017) Radio emission from the Ganymede-Jupiter interaction and consequence for radio emission from exoplanets. SubmittedGoogle Scholar