Modeling of the exoplanet HAT-P-11b magnetosphere

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Abstract

Based on the available data on the magnetic field of the star HAT-P-11 and its closest exoplanet HAT-P-11b, as well as information on the stellar wind in this system, we construct the HAT-P-11b magnetic field magnetospheric model. We show how the value and orientation of the interplanetary magnetic field control the magnetospheric structure. Each component of the stellar wind’s magnetic field creates a specific type of reconnection with the exoplanet’s magnetic field.

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About the authors

E. S. Belenkaya

Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics (SINP MSU)

Author for correspondence.
Email: elena@dec1.sinp.msu.ru
Russian Federation, Moscow

I. I. Alexeev

Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics (SINP MSU)

Email: iialexeev@mail.ru
Russian Federation, Moscow

V. V. Kalegaev

Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics (SINP MSU)

Email: klg@dec1.sinp.msu.ru
Russian Federation, Moscow

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2. Fig. 1. Magnetosphere of the exoplanet HAT-P-11b for zero IMF in the noon-midnight section. The model parameters are given in the text of the article, the magnetic moment of the exoplanet is directed to the north. Solid lines show magnetic field lines; dashed line shows magnetopause. The exoplanet is marked with a circle. X and Z coordinates are plotted along the horizontal and vertical axes.

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3. Fig. 2. Same as Fig. 1, but for IMF with components {0, 0, 38} nT. Open magnetosphere of HAT-P-11b for moderate northern IMF. Dashed lines in all figures indicate interplanetary magnetic field lines that have penetrated the magnetosphere (shown by dotted lines).

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4. Fig. 3. The same as in Fig. 2, but for a strong northern IMF: {0, 0, 110} nT.

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5. Fig. 4. Closed magnetosphere of HAT-P-11b with moderate southern IMF: {0, 0, -38} nT.

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6. Fig. 5. The same as in Fig. 4, but for a strong southern IMF: {0, 0, -110} nT.

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7. Fig. 6. Magnetosphere of HAT-P-11b for IMF with negative radial IMF component: {-75, 0, 0} nT.

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