10:00 AM - 10:15 AM
[PAE18-05] CONSTRAINING MAGNETIC FIELD OF EXOPLANETS BY RESOVING FINE STRUCTURE OF MULTIPLET LINES
Keywords:atomic alignment, spectroscopy, magnetic fields , numerical simulation
One of the most fundamental questions in exoplanetary sciences to date is how to estimate planetary magnetic fields having no possibility to measure it directly. Complex numerical simulations revealed that magnetic fields can significantly shape the atmosphere and its escape with important consequences for available and future observations. Without any information on planetary magnetic field the interpretation of transit absorptions by exoplanets’ atmospheres is hindered.
From theoretical studies of fine effects of spin-orbital atomic alignment (Varshalovich 1971) it is known that excitation of transitions by a directed radiation field can lead, through the selective absorption of photons, to a significant anisotropy and a deviation of the relative population of sublevels from the classic statistical weight formular 2J+1. For atmospheres of close-orbit exoplanets a host star acts as a directed radiation source, potentially changing the relative absorption amplitudes within multiplet of a given line, producing the observable effect. On the other hand, a global magnetic field also affecs the relative absorption amplitudes within multiplet. This opens an essentially new way of constraining magnetic fields of hot exoplanets by accurate spectrally resolved measurements of absorption by multiplet lines.
In this work we report on the method of accurate calculation of fine multiplet structure of suitable lines subjected to directed radiation pumping in presence of a relatively weak magnetic field. We apply the effect to estimate quantitatively its potential to transit absorptions of hot exoplanets. The further development of this method can make a significant contribution to many branches of planetary and atmospheric sciences.
This work was supported by the RNF projects № 23-12-00134
From theoretical studies of fine effects of spin-orbital atomic alignment (Varshalovich 1971) it is known that excitation of transitions by a directed radiation field can lead, through the selective absorption of photons, to a significant anisotropy and a deviation of the relative population of sublevels from the classic statistical weight formular 2J+1. For atmospheres of close-orbit exoplanets a host star acts as a directed radiation source, potentially changing the relative absorption amplitudes within multiplet of a given line, producing the observable effect. On the other hand, a global magnetic field also affecs the relative absorption amplitudes within multiplet. This opens an essentially new way of constraining magnetic fields of hot exoplanets by accurate spectrally resolved measurements of absorption by multiplet lines.
In this work we report on the method of accurate calculation of fine multiplet structure of suitable lines subjected to directed radiation pumping in presence of a relatively weak magnetic field. We apply the effect to estimate quantitatively its potential to transit absorptions of hot exoplanets. The further development of this method can make a significant contribution to many branches of planetary and atmospheric sciences.
This work was supported by the RNF projects № 23-12-00134