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Size and Strength of Self-excited Dynamos in Jupiter-like Extrasolar Planets

Journal Article · · The Astrophysical Journal (Online)
 [1];  [2]
  1. Univ. of Rochester, Rochester, NY (United States); Harvard Univ., Cambridge, MA (United States); Laboratory for Laser Energetics, University of Rochester
  2. Univ. of Rochester, Rochester, NY (United States)
+ Show Author Affiliations
The magnetization of solar and extrasolar gas giants is critically dependent on electronic and mass transport coefficients of their convective fluid interiors. We analyze recent laboratory experimental results on metallic hydrogen to derive a new conductivity profile for the Jovian-like planets. We combine this revised conductivity with a polytropic-based thermodynamic equation of state to study the dynamo action in 100 extrasolar giant planets varying from synchronous hot Jupiters to fast rotators, with masses ranging from 0.3MJ to 15MJ. We find dynamo cores larger than previous estimates, but consistent with the results from Juno, suggesting that the field generation in the more massive planets might be shallow-seated. Our results reveal that most extrasolar giants are expected to possess dipole surface magnetic fields in the range of 0.1-10 Gauss. Assuming radio emission processes similar to our solar giants, the stronger emitters are expected to have maximal cyclotron frequencies between 20-40 MHz and for those within few 10 pc, few have flux densities greater than 1 mJy. In conclusion, our work places new bounds on the observational detectability of extrasolar magnetic fields.
Research Organization:
Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0001944
OSTI ID:
1462988
Journal Information:
The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 1 Vol. 862; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Magnetic field strengths of hot Jupiters from signals of star–planet interactions journal July 2019
MOVES – II. Tuning in to the radio environment of HD189733b journal March 2019
Striking isotope effect on the metallization phase lines of liquid hydrogen and deuterium journal September 2018
MOVES II. Tuning in to the radio environment of HD189733b text January 2019

Figures / Tables (8)

Table 1(p. 9)table Table 1
FIG. 1(p. 12)figure FIG. 1
Fig. 2(p. 13)figure Fig. 2
FIG. 3(p. 14)figure FIG. 3
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FIG. 5(p. 16)figure FIG. 5
FIG. 6(p. 17)figure FIG. 6
FIG. 7(p. 18)figure FIG. 7

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
dynamo - planets and satellites
interiors - planets and satellites
magnetic fields