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Radio Observations as an Exoplanet Discovery Method

  • T. Joseph W. LazioEmail author
Reference work entry

Abstract

Detection of radio emission from Jupiter was identified quickly as being due to its planetary-scale magnetic field. Subsequent spacecraft investigations have revealed that many of the planets, and even some moons, either have or have had a planetary-scale magnetic field. In the case of the Earth, Jupiter, Saturn, Uranus, and Neptune, the magnetic field is generated by dynamo processes within the planet, and an interaction between the solar wind and their magnetic fields generates intense radio emission via the electron cyclotron maser instability. Not only may the radio emissions be a means for discovering extrasolar planets, because magnetic fields are tied to the properties of planetary interiors, radio emissions may be a remote sensing means of constraining extrasolar planetary properties that will be otherwise difficult to access. In the case of terrestrial planets, the presence or absence of a magnetic field may be an indicator for habitability. While no extrasolar planets have yet been detected in the radio, new ground-based telescopes and new possibilities for space-based telescopes provide promise for the near future.

References

  1. Alexander JK, Brown LW, Clark TA, Stone RG, Weber RR (1969) The spectrum of the cosmic radio background between 0.4 and 6.5 MHz. ApJ 157:L163ADSCrossRefGoogle Scholar
  2. Alexander JK, Kaiser ML, Novaco JC, Grena FR, Weber RR (1975) Scientific instrumentation of the radio-astronomy-explorer-2 Satellite. A&A 40:365ADSGoogle Scholar
  3. Banazadeh P, Lazio J, Jones D, Scharf DP, Fowler W, Aladangady C (2013) Feasibility analysis of XSOLANTRA: a mission concept to detect exoplanets with an array of CubeSats. In: Proceedings of 2013 IEEE aerospace conference.  https://doi.org/10.1109/AERO.2013.6496864
  4. Bastian TS, Dulk GA, Leblanc Y (2000) A search for radio emission from extrasolar planets. ApJ 545:1058. https://doi.org/10.1086/317864ADSCrossRefGoogle Scholar
  5. Baumback MM, Gurnett DA, Calvert W, Shawhan SD (1986) Satellite interferometric measurements of auroral kilometric radiation. Geophys Res Lett 13:1105ADSCrossRefGoogle Scholar
  6. Berger E, Ball S, Becker KM et al (2001) Discovery of radio emission from the brown dwarf LP944-20. Nature 410:338ADSCrossRefGoogle Scholar
  7. Burke BF, Franklin KL (1955) Observations of a variable radio source associated with the planet Jupiter. J Geophys Res 60:213ADSCrossRefGoogle Scholar
  8. Burningham B, Hardcastle M, Nichols JD et al (2016) A LOFAR mini-survey for low-frequency radio emission from the nearest brown dwarfs. MNRAS 463:2202.  https://doi.org/10.1093/mnras/stw2065ADSCrossRefGoogle Scholar
  9. Cane HV (1979) Spectra of the non-thermal radio radiation from the galactic polar regions. MNRAS 189:465ADSCrossRefGoogle Scholar
  10. Carr TD, Gulkis S (1969) The magnetosphere of Jupiter. Ann Rev Astron Astrophys 7:577ADSCrossRefGoogle Scholar
  11. Christensen UR (2010) Dynamo scaling laws and applications to the planets. Space Sci Rev:152:565ADSCrossRefGoogle Scholar
  12. Christensen UR, Holzwarth V, Reiners A (2009) Energy flux determines magnetic field strength of planets and stars. Nature 457:167.  https://doi.org/10.1038/nature07626ADSCrossRefGoogle Scholar
  13. de Pater I, Butler BJ, Green DA, Strom R, Millan R, Klein MJ, Bird MK, Funke O, Neidhöfer J, Maddalena R, Sault RJ, Kesteven M, Smits DP, Hunstead R (2003) Jupiter’s radio spectrum from 74 MHz up to 8 GHz. Icarus 163:434. https://doi.org/10.1016/S0019-1035(03)00067-8ADSCrossRefGoogle Scholar
  14. Driscoll P, Olson P (2011) Optimal dynamos in the cores of terrestrial exoplanets: magnetic field generation and detectability. Icarus 213:12ADSCrossRefGoogle Scholar
  15. Fares R, Donati J-F, Moutou C, Jardine MM, Griessmeier J-M, Zarka P, Shkolnik EL, Bohlender D, Catala C, Collier Cameron A (2010) Searching for star-planet interactions within the magnetosphere of HD 189733. MNRAS 406:409ADSCrossRefGoogle Scholar
  16. Farrell WM, Desch MD, Zarka P (1999) On the possibility of coherent cyclotron emission from extrasolar planets. J Geophys Res 104:14025ADSCrossRefGoogle Scholar
  17. Fennelly AJ, Matloff GL (1974) Radio detection of Jupiter-like extra-solar planets. J Brit Interplanet Soc 27:660ADSGoogle Scholar
  18. Franklin KL, Burke BF (1956) Radio observations of Jupiter. AJ 61:177ADSCrossRefGoogle Scholar
  19. French FW, Huguenin GR, Rodman AK (1967) A synthetic aperture approach to space-based radio telescopes. J Spacecr Rocket 4:1649CrossRefGoogle Scholar
  20. Fujii Y, Spiegel DS, Mroczkowski T, Nordhaus J, Zimmerman NT, Parsons A, Mirbabayi M, Madhusudhan N (2015) Radio emission from red-giant hot Jupiters. ApJ 820:122. https://doi.org/10.3847/0004-637X/820/2/122ADSCrossRefGoogle Scholar
  21. Gallagher DL, Dangelo N (1981) Correlations between solar wind parameters and auroral kilometric radiation intensity. Geophys Res Lett 8:1087ADSCrossRefGoogle Scholar
  22. George SJ, Stevens IR (2007) Giant metrewave radio telescope low-frequency observations of extrasolar planetary systems. MNRAS 382:455. https://doi.org/10.1111/j.1365-2966.2007.12387.xADSCrossRefGoogle Scholar
  23. Griessmeier J-M (2007) Aspects of the magnetosphere stellar wind interaction of close-in extrasolar planets. Planet Space Sci 55:530ADSCrossRefGoogle Scholar
  24. Grießmeier J-M, Stadelmann A, Penz T et al (2004) The effect of tidal locking on the magnetospheric and atmospheric evolution of ‘Hot Jupiters’. A&A 425:753ADSCrossRefGoogle Scholar
  25. Griessmeier J-M, Motschmann U, Mann G, Rucker HO (2005) The influence of stellar wind conditions on the detectability of planetary radio emissions. A&A 437:717ADSCrossRefGoogle Scholar
  26. Griessmeier J-M, Preusse S, Khodachenko M, Motschmann U, Mann G, Rucker HO (2007a) Exoplanetary radio emission under different stellar wind conditions. Planet Space Sci 55:618ADSCrossRefGoogle Scholar
  27. Griessmeier J-M, Zarka P, Spreeuw H (2007b) Predicting low-frequency radio fluxes of known extrasolar planets. A&A 475:359ADSCrossRefGoogle Scholar
  28. Grießmeier J-M, Khodachenko M, Lammer H, Grenfell JL, Stadelmann A, Motschmann U (2010) Stellar activity and magnetic shielding. In: Kosovid’ev AG, Andrei AH, Rozelot J-P (eds)Solar and stellar variability: impact on earth and planets. Proceedings of international astronomical union. IAU symposium, vol 264. Cambridge University Press, Cambridge, p 385CrossRefGoogle Scholar
  29. Gurnett DA, Kurth WS, Hospodarsky GB et al (2002) Control of Jupiter’s radio emission and aurorae by the solar wind. Nature 415:985ADSCrossRefGoogle Scholar
  30. Hallinan G, Antonova A, Doyle JG, Bourke S, Lane C, Golden A (2008) Confirmation of the electron cyclotron maser instability as the dominant source of radio emission from very low mass stars and brown dwarfs. ApJ 684:644. https://doi.org/10.1086/590360ADSCrossRefGoogle Scholar
  31. Hallinan G, Sirothia SK, Antonova A, Ishwara-Chandra CH, Bourke S, Doyle JG, Hartman J, Golden A (2013) Looking for a pulse: a search for rotationally modulated radio emission from the hot Jupiter, τ Boötis b. ApJ 762:34ADSCrossRefGoogle Scholar
  32. Ignace R, Giroux ML, Luttermoser DG (2010) Radio emissions from substellar companions of evolved cool stars. MNRAS 402:2609. https://doi.org/10.1111/j.1365-2966.2009.16085.xADSCrossRefGoogle Scholar
  33. Jaeger TR, Osten RA, Lazio TJ, Kassim N, Mutel RL (2011) 325 MHz very large array observations of ultracool dwarfs TVLM 513-46546 and 2MASS J0036+ 1821104. AJ 142:189. https://doi.org/10.1088/0004-6256/142/6/189ADSCrossRefGoogle Scholar
  34. Jakosky BM, Grebowsky JM, Luhmann JG et al (2015) MAVEN observations of the response of Mars to an interplanetary coronal mass ejection. Science 350:0210.  https://doi.org/10.1126/science.aad0210CrossRefGoogle Scholar
  35. Jardine M, Collier Cameron A (2008) Radio emission from exoplanets: the role of the stellar coronal density and magnetic field strength. A&A 490:843ADSCrossRefGoogle Scholar
  36. Jones DL et al (2000) The ALFA medium explorer mission. Adv Space Res 26:743ADSCrossRefGoogle Scholar
  37. Kao MM, Hallinan G, Pineda JS, Escala I, Burgasser A, Bourke S, Stevenson D (2016) Auroral radio emission from late L and T dwarfs: a new constraint on dynamo theory in the substellar regime. ApJ 818:24. https://doi.org/10.3847/0004-637X/818/1/24ADSCrossRefGoogle Scholar
  38. Klein MJ, Thompson TJ, Bolton S (1989) Systematic observations and correlation studies of variations in the synchrotron radio emission from Jupiter. In: Belton MJS, West RA, Rahe J, Pereyda M (eds) Time-variable phenomena in the Jovian system. NASA special publication series, NASA-SP-494. NASA, Washington, DC, p 151Google Scholar
  39. Lazio TJW, Farrell WM (2007) Magnetospheric emissions from the planet orbiting τ Bootis: a multiepoch search. ApJ 668:1182ADSCrossRefGoogle Scholar
  40. Lazio TJW, Farrell WM, Dietrick J, Greenlees E, Hogan E, Jones C, Hennig LA (2004) The radiometric bode’s law and extrasolar planets. ApJ 612:511ADSCrossRefGoogle Scholar
  41. Lazio TJW, Carmichael S, Clark J, Elkins E, Gudmundsen P, Mott Z, Szwajkowski M, Hennig LA (2010a) A blind search for magnetospheric emissions from planetary companions to nearby solar-type stars. AJ 139:96ADSCrossRefGoogle Scholar
  42. Lazio TJW, Shankland PD, Farrell WM, Blank DL (2010b) Radio observations of HD 80606 near planetary periastron. AJ 140:1929ADSCrossRefGoogle Scholar
  43. Lazio TJW, Shkolnik E, Hallinan G et al (2016) Planetary magnetic fields: planetary interiors and habitability. W. M. Keck Institute for Space Studies. http://kiss.caltech.edu/new_website/programs/magnetic_final_report.pdf
  44. Lecavelier Des Etangs A, Sirothia SK, Gopal-Krishna A, Zarka P (2009) GMRT radio observations of the transiting extrasolar planet HD 189733 b at 244 and 614 MHz. A&A 500:L51ADSCrossRefGoogle Scholar
  45. Lecavelier Des Etangs A, Sirothia SK, Gopal-Krishna A, Zarka P (2011) GMRT search for 150 MHz radio emission from the transiting extrasolar planets HD 189733 b and HD 209458 b. A&A 533:A50ADSCrossRefGoogle Scholar
  46. Lecavelier Des Etangs A, Sirothia SK, Gopal-Krishna A, Zarka P (2013) Hint of 150 MHz radio emission from the Neptune-mass extrasolar transiting planet HAT-P-11b. A&A 552:A65ADSCrossRefGoogle Scholar
  47. Lynch C, Murphy T, Ravi V, Hobbs G, Lo K, Ward C (2016) Radio detections of southern ultracool dwarfs. MNRAS 457:1224.  https://doi.org/10.1093/mnras/stw050ADSCrossRefGoogle Scholar
  48. Murphy T, Bell ME, Kaplan DL et al (2015) Limits on low frequency radio emission from southern exoplanets with the Murchison widefield array. MNRAS 446:2560.  https://doi.org/10.1093/mnras/stu2253ADSCrossRefGoogle Scholar
  49. Mutel R, Gurnett DA, Christopher I (2004) Spatial and temporal properties of AKR burst emission derived from cluster WBD VLBI studies. Ann Geophys 22:2625ADSCrossRefGoogle Scholar
  50. Nichols JD (2011) Magnetosphere-ionosphere coupling at Jupiter-like exoplanets with internal plasma sources: implications for detectability of auroral radio emissions. MNRAS 414:2125ADSCrossRefGoogle Scholar
  51. Nichols JD (2012) Candidates for detecting exoplanetary radio emissions generated by magnetosphere-ionosphere coupling. MNRAS 427:L75ADSGoogle Scholar
  52. Pérez LM, Carpenter JM, Andrews SM et al (2016) Spiral density waves in a young protoplanetary disk. Science 353:1519.  https://doi.org/10.1126/science.aaf8296ADSMathSciNetCrossRefGoogle Scholar
  53. Reiners A, Christensen UR (2010) A magnetic field evolution scenario for brown dwarfs and giant planets. A&A 522:A13ADSCrossRefGoogle Scholar
  54. Rogers LA, Seager S (2010) A framework for quantifying the degeneracies of exoplanet interior compositions. ApJ 712:974ADSCrossRefGoogle Scholar
  55. Route M, Wolszczan A (2016) Radio flaring from the T6 dwarf WISEPC J112254.73+ 255021.5 with a possible ultra-short periodicity. ApJ 821:L21. http://doi.org/10.3847/2041-8205/821/2/L21ADSCrossRefGoogle Scholar
  56. Schubert G, Soderlund KM (2011) Planetary magnetic fields: observations and models. Phys Earth Plan Inter 187:92ADSCrossRefGoogle Scholar
  57. Sirothia SK, Lecavelier des Etangs A, Gopal-Krishna A, Kantharia NG, Ishwar-Chandra CH (2014) Search for 150 MHz radio emission from extrasolar planets in the TIFR GMRT sky survey. A&A 562:A108. https://doi.org/10.1051/0004-6361/201321571ADSCrossRefGoogle Scholar
  58. Smith AMS, Collier Cameron A, Greaves J, Jardine M, Langston G, Backer D (2009) Secondary radio eclipse of the transiting planet HD 189733 b: an upper limit at 307–347 MHz. MNRAS 395:335. https://doi.org/10.1111/j.1365-2966.2009.14510.xADSCrossRefGoogle Scholar
  59. Stevens IR (2005) Magnetospheric radio emission from extrasolar giant planets: the role of the host stars. MNRAS 356:1053ADSCrossRefGoogle Scholar
  60. Stevenson DJ (2010) Planetary magnetic fields: achievements and prospects. Space Sci Rev 152:651ADSCrossRefGoogle Scholar
  61. Tarter J (2001) The search for extraterrestrial intelligence (SETI). ARA&A 39:511.  https://doi.org/10.1146/annurev.astro.39.1.511ADSCrossRefGoogle Scholar
  62. Taylor GB, Ellingson SW, Kassim NE et al (2012) First light for the first station of the long wavelength array. J Astron Instrum 1:1250004. https://doi.org/10.1142/S2251171712500043CrossRefGoogle Scholar
  63. Treumann RA (2006) The electron-cyclotron maser for astrophysical application. A&A Rev 13:229ADSCrossRefGoogle Scholar
  64. van Haarlem MP et al (2013) LOFAR: the lOw-frequency array. A&A 556:A2ADSCrossRefGoogle Scholar
  65. Vanhamäki H (2011) Emission of cyclotron radiation by interstellar planets. Planet Space Sci 59:862. https://doi.org/10.1016/j.pss.2011.04.002ADSCrossRefGoogle Scholar
  66. Vidotto AA, Opher M, Jatenco-Pereira V, Gombosi TI (2010) Simulations of winds of weak-lined T Tauri stars. II. The effects of a tilted magnetosphere and planetary interactions. ApJ 720:1262. https://doi.org/10.1088/0004-637X/720/2/1262ADSCrossRefGoogle Scholar
  67. Vorgul I, Kellett BJ, Cairns RA, Bingham R, Ronald K, Speirs DC, McConville SL, Gillespie KM, Phelps ADR (2011) Cyclotron maser emission: Stars, planets, and laboratory. Phys Plasmas 18:056501. https://doi.org/10.1063/1.3567420ADSCrossRefGoogle Scholar
  68. Willes AJ, Wu K (2005) Radio emissions from terrestrial planets around white dwarfs. A&A 432:1091. https://doi.org/10.1051/0004-6361:20040417ADSCrossRefGoogle Scholar
  69. Winglee RM, Dulk GA, Bastian TS (1986) A search for cyclotron maser radiation from substellar and planet-like companions of nearby stars. ApJ 309:L59ADSCrossRefGoogle Scholar
  70. Wolf S (2008) Detecting protoplanets with ALMA. Ap&SS 313:109. https://doi.org/10.1007/ s10509-007-9660-z
  71. Wood BE, Linsky JL, Müller H-R, Zank GP (2001) Observational estimates for the mass-loss rates of α centauri and proxima centauri using hubble space telescope Lyα spectra. ApJ 547:L49ADSCrossRefGoogle Scholar
  72. Wood BE, Müller H-R, Zank GP, Linsky JL (2002) Measured mass-loss rates of solar-like stars as a function of age and activity. ApJ 574:412ADSCrossRefGoogle Scholar
  73. Wood BE, Müller H-R, Zank GP, Linsky JL, Redfield S (2005) New mass-loss measurements from astrospheric Lyα absorption. ApJ 628:L143ADSCrossRefGoogle Scholar
  74. Yantis WF, Sullivan WT III, Erickson WC (1977) A search for extra-solar Jovian planets by radio techniques. BAAS 9:453ADSGoogle Scholar
  75. Zarka P (1992) The auroral radio emissions from planetary magnetospheres – what do we know, what don’t we know, what do we learn from them? Adv Space Res 12:99ADSCrossRefGoogle Scholar
  76. Zarka P (2006) Hot Jupiters and magnetized stars: giant analogs of the satellite-Jupiter system. In: Rucker H, Kurth W, Mann G (eds) Planetary radio emissions VI. Austrian Academy of Sciences Press, Vienna, p. 543Google Scholar
  77. Zarka P (2007) Plasma interactions of exoplanets with their parent star and associated radio emissions. Planet Space Sci 55:598ADSCrossRefGoogle Scholar
  78. Zarka P, Queinnec J, Ryabov BP et al (1997) Ground-based high sensitivity radio astronomy at decameter wavelengths. in planetary radio emission IV. In: Rucker HO, Bauer SJ, Lecacheux A (eds) Proceedings of the 4th international workshop. Austrian Academy of Sciences Press, Vienna, p 101Google Scholar
  79. Zarka P, Treumann RA, Ryabov BP, Ryabov VB (2001) Magnetically-driven planetary radio emissions and application to extrasolar planets. Ap&SS 277:293ADSCrossRefGoogle Scholar

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© This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply 2018

Authors and Affiliations

  1. 1.Jet Propulsion LaboratoryCalifornia Institute of TechnologyPasadenaUSA

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