2008A&A...490..843J


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.01CEST13:46:19

2008A&A...490..843J - Astronomy and Astrophysics, volume 490, 843-851 (2008/11-1)

Radio emission from exoplanets: the role of the stellar coronal density and magnetic field strength.

JARDINE M. and CAMERON A.C.

Abstract (from CDS):

The search for radio emission from extra-solar planets has so far been unsuccessful. Much of the effort in modelling the predicted emission has been based on the analogy with the well-known emission from Jupiter. Unlike Jupiter, however, many of the targets of these radio searches are so close to their parent stars that they may well lie inside the stellar magnetosphere. For these close-in planets we determine which physical processes dominate the radio emission and compare our results to those for large-orbit planets that are that are immersed in the stellar wind. We have modelled the reconnection of the stellar and planetary magnetic fields. We calculate the extent of the planetary magnetosphere if it is in pressure balance with its surroundings and determine the conditions under which reconnection of the stellar and planetary magnetic fields could provide the accelerated electrons necessary for the predicted radio emission. We show that received radio fluxes of tens of mJy are possible for exoplanets in the solar neighbourhood that are close to their parent stars if their stars have surface field strengths above 1-10 G. We show that for these close-in planets, the power of the radio emission depends principally on the ratio (Nc/B*1/3)2 where Nc is the density at the base of the stellar corona, and B* is the stellar surface magnetic field strength. Radio emission is most likely to be detected from planets around stars with high-density coronae, which are therefore likely to be bright X-ray sources. The dependence of stellar coronal density on stellar rotation rate and effective temperature is crucial in predicting radio fluxes from exoplanets.

Abstract Copyright:

Journal keyword(s): stars: planetary systems

Status at CDS:  

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * ups And PM* 01 36 47.84216 +41 24 19.6443 4.70 4.64 4.10 3.64 3.35 F9V 886 1
2 UCAC4 657-006214 PM* 01 36 50.4042757949 +41 23 32.123869669       13.65   M4.5V 19 0
3 HD 69830b Pl 08 18 23.94706 -12 37 55.8116           ~ 56 1
4 * rho01 Cnc e Pl 08 52 35.81093 +28 19 50.9511           ~ 379 1
5 * tau Boo b Pl 13 47 15.74340 +17 27 24.8552           ~ 231 1
6 * tau Boo ** 13 47 15.74340 +17 27 24.8552 5.02 4.98 4.49 4.09 3.85 F7IV-V 869 1
7 * mu. Ara d Pl 17 44 08.7036342277 -51 50 02.591049123           ~ 55 2
8 HD 179949b Pl 19 15 33.2300861317 -24 10 45.673372382           ~ 97 1
9 HD 179949 PM* 19 15 33.2300861317 -24 10 45.673372382   6.772 6.237     F8V 342 1
10 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1046 1
11 HD 189733 BY* 20 00 43.7130382888 +22 42 39.071811263 9.241 8.578 7.648 7.126 6.68 K0V+M4V 707 1
12 BD-15 6290d Pl 22 53 16.73352 -14 15 49.3186           ~ 134 1
13 * 51 Peg b Pl 22 57 27.9804167474 +20 46 07.782240714           ~ 511 1

    Equat.    Gal    SGal    Ecl

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2020.04.01-13:46:19

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