Hercules A

Hercules A
Radio-Optical View of the Galaxy Hercules A - Many thanks to: NASA, ESA, S. Baum and C. O'Dea (RIT), R. Perley and W. Cotton (NRAO/AUI/NSF), and the Hubble Heritage Team (STScI/AURA)
Showing posts with label Exoplanets. Show all posts
Showing posts with label Exoplanets. Show all posts

Saturday, July 30, 2016

"Radio Emission from Red-Giant Hot Jupiters" Fujii et al. 2016

I refer to:

http://arxiv.org/abs/1601.05428

http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1601.05428

90 references in the paper :
http://adsabs.harvard.edu/cgi-bin/nph-ref_query?bibcode=2016ApJ...820..122F&refs=REFERENCES&db_key=AST

Abstract: "When planet-hosting stars evolve off the main sequence and go through the red-giant branch, the stars become orders of magnitudes more luminous and, at the same time, lose mass at much higher rates than their main-sequence counterparts. Accordingly, if planetary companions exist around these stars at orbital distances of a few au, they will be heated up to the level of canonical hot Jupiters and also be subjected to a dense stellar wind. Given that magnetized planets interacting with stellar winds emit radio waves, such “Red-Giant Hot Jupiters” (RGHJs) may also be candidate radio emitters. We estimate the spectral auroral radio intensity of RGHJs based on the empirical relation with the stellar wind as well as a proposed scaling for planetary magnetic fields. RGHJs might be intrinsically as bright as or brighter than canonical hot Jupiters and about 100 times brighter than equivalent objects around main-sequence stars. We examine the capabilities of low-frequency radio observatories to detect this emission and find that the signal from an RGHJ may be detectable at distances up to a few hundred parsecs with the Square Kilometer Array."



Thursday, January 16, 2014

Noyola Satyal Musielak 2013: "Detection of Exomoons Through Their Modulation of Exoplanetary Radio Emissions"

I refer to Noyola Satyal Musielak 2013: "Detection of Exomoons Through Their Modulation of Exoplanetary Radio Emissions"
http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1308.4184

Abstract: "In the Jupiter-Io system, the moon's motion produces currents along the field lines that connect the moon to the Jupiter's polar regions, where the radio emission is modulated by the currents. Based on this process, we suggest that such modulation of planetary radio emissions may reveal the presence of exomoons around giant planets in exoplanetary systems. The required physical conditions for the modulation are established and used to select potential candidates for exomoon's detection. A cautiously optimistic scenario of possible detection of such exomoons with the Long Wavelength Array (LWA) and the Low-Frequency Array (LOFAR) radio telescopes is provided."









Thursday, March 7, 2013

Possible detection of 150 MHz radio emission from exoplanet HAT-P-11b

I refer to: Lecavelier Sirothia Gopal-Krishna Zarka 2013 :
http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1302.4612 http://arxiv.org/abs/1302.4612v1 34

References at :
http://adsabs.harvard.edu/cgi-bin/nph-ref_query?bibcode=2013arXiv1302.4612L&refs=REFERENCES&db_key=PRE 
 
This is a 3 standard deviation detection with the Giant Meterwave Radio Telescope in India. As frequently happens: more data is needed.