April 8, 2015

Aurora effects of hot Jupiters; possible spectroscopic magnetic field detection? Radio signal determination of closeness to stellar corona?

Filed under: Letters from Ionia — Tags: , , , , — zankaon @ 12:55 pm

For hot Jupiter transits of their respective stars, if one could only visualize the former’s aurora. Our Jupiter has such aurora, and a strong magnetic ‘field’. For a hot jupiter, it’s orbit would be far inside of Mercury’s orbit; but how far from (or in?) such star’s corona?

Such intense corona, like for our sun, is probably a result of magnetic ‘field’ energy, magnetic re-connect, and hence redistribution of such magnetic energy. Might strong magnetic energy density of such hot Jupiter be close enough to such star’s corona for enhanced interaction, and thus enhancement of any aurora effect?

Might one have spectrographic detection, such as Zeeman effect etc. i.e. energy level splitting emission line from electron spin-orbit effect in magnetic field? Might one have a periodic ‘hot spot’ effect (such as periodic increase in number of emission lines?) from stellar and hot Jupiter magnetic field interaction, consistent with orbital dynamics? However rotation of the star can give periodic variability, and result in broadening of emission line and affect separation of lines. Differences in right and left polarization of such lines; perhaps helpful in increased sensitivity of detection of such magnetic effects?

In principle, might one visualize such transit, in optical or uv band emission lines; hence indicating how close such hot jupiter is to such star; limits, for example less than ~10 solar radii, and/or 1-2 x10^6 km? In comparison, Mercury`s perihelion is ~46 x10^6 km.

How else might one perhaps ascertain how close such hot jupiter is to corona? Our Jupiter has a strong radio signal. Might a hot jupiter have enhancement of such radio signal from interaction of such planet with the star’s magnetic ‘field’ and magnetic reconnect and energy of corona region?

Also since such hot jupiter has a short period, one would expect periodicity to such radio signal, such as for edge on view of transit hot jupiter, wherein one might have a periodic gap in radio signal when planet is occluded by star. Then would tangent velocity estimate, together with period, give circumference and thus radius?

Conversely, for transverse velocity of 13 km/s, and for assumed radial orbit of 1 million km (corona 1-2 million km radius?), then derived circumference, and estimated resultant period of ~3.6 days?

So might such hot jupiter be in corona, or even at a shorter radius? How would this affect a radio signal; amplification or distortion? For more detail, see related radio source blog link below. TMM

J.D. Landstreet Magnetic fields


Sun’s corona


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