J/MNRAS/478/1763 Detectability of radio emission from exoplanets (Lynch+, 2018)
The detectability of radio emission from exoplanets.
Lynch C.R., Murphy T., Lenc E., Kaplan D.L.
<Mon. Not. R. Astron. Soc., 478, 1763-1775 (2018)>
=2018MNRAS.478.1763L 2018MNRAS.478.1763L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Magnetic fields ;
Radio sources
Keywords: plasmas - radiation mechanisms: non-thermal -
radio continuum: planetary systems
Abstract:
Like the magnetized planets in our Solar system, magnetized exoplanets
should emit strongly at radio wavelengths. Radio emission directly
traces the planetary magnetic fields and radio detections can place
constraints on the physical parameters of these features. Large
comparative studies of predicted radio emission characteristics for
the known population of exoplanets help to identify what physical
parameters could be the key for producing bright, observable radio
emission. Since the last comparative study, many thousands of
exoplanets have been discovered. We report new estimates for the radio
flux densities and maximum emission frequencies for the current
population of known exoplanets orbiting pre-main-sequence and
main-sequence stars with spectral types F-M. The set of exoplanets
predicted to produce observable radio emission are Hot Jupiters
orbiting young stars. The youth of these systems predicts strong
stellar magnetic fields and/or dense winds, which are the key for
producing bright, observable radio emission. We use a new all-sky
circular polarization Murchison Widefield Array survey to place
sensitive limits on 200MHz emission from exoplanets, with 3σ
values ranging from 4.0 to 45.0mJy. Using a targeted Giant Metrewave
Radio Telescope observing campaign, we also report a 3σ upper
limit of 4.5mJy on the radio emission from V830 Tau b, the first Hot
Jupiter to be discovered orbiting a pre-main-sequence star. Our limit
is the first to be reported for the low-frequency radio emission from
this source.
Description:
To generate our sample of exoplanets we use the full catalogue of the
Extrasolar Planet Encyclopaedia and the confirmed source catalogue for
the NASA Exoplanet archive from 2018 February 19.
The predicted maximum emission frequencies and radio flux densities
from the kinetic and magnetic RBL are listed in Table 1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 106 528 The properties of the exoplanet included
in our sample
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See also:
J/A+A/562/A108 : 150MHz emission from exoplanets (Sirothia+, 2014)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 25 A25 --- Name Planet name
27- 28 I2 h RAh Right ascension (J2000)
30- 31 I2 min RAm Right ascension (J2000)
33- 34 I2 s RAs Right ascension (J2000)
36 A1 --- DE- Declination sign (J2000)
37- 38 I2 deg DEd Declination (J2000)
40- 41 I2 arcmin DEm Declination (J2000)
43- 44 I2 arcsec DEs Declination (J2000)
46- 50 F5.2 Mjup Mp Planetary mass relative to Jupiter
52- 55 F4.2 Rjup Rp Planetary radius relative to Jupiter
57- 63 F7.2 AU a Semi-major axis
65- 71 F7.2 pc d Distance to star-planet system
73- 78 F6.3 Gyr t Age of the host star
80- 84 I5 MHz nu Expected maximum emission frequency
86- 88 F3.1 mJy Snuk Expected radio flux density (kinetic energy case)
90- 94 F5.1 mJy Snum Expected radio flux density (magnetic energy case)
96 A1 --- l_S150 Limit flag on S150
97-100 F4.1 --- S150 ? Best observational 3-sigma limit at 150MHz
in the literature
102-106 A5 --- r_S150 Reference for 3-sigma limit (1)
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Note (1): References as follows:
Hal13 = Hallinan et al. (2013ApJ...762...34H 2013ApJ...762...34H)
Lyn17 = Lynch et al. (2017MNRAS.467.3447L 2017MNRAS.467.3447L)
Mur15 = Murphy et al. (2015MNRAS.446.2560M 2015MNRAS.446.2560M)
Sir14 = Sirothia et al. (2014A&A...562A.108S 2014A&A...562A.108S, Cat. J/A+A/562/A108)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 01-Jul-2021