Simulation of 10830 Å absorption with a 3D hydrodynamic model reveals the solar He abundance in upper atmosphere of WASP-107b

Abstract

Transmission spectroscopy of WASP-107b revealed 7-8% absorption at the position of metastable HeI triplet at 10830 Å in Doppler velocity range of [-20; 10] km/s, which is stronger than that measured in other exoplanets. With a dedicated 3D self-consistent hydrodynamic multi-fluid model we calculated the expanding upper atmosphere of WASP-107b and reproduced within the observations accuracy the measured HeI absorption profiles, constraining the stellar XUV flux to (6-10) erg cm-2 s-1 at 1 a.u., and the upper atmosphere helium abundance He/H to 0.075-0.15. The radiation pressure acting on the metastable HeI atoms was shown to be an important factor affecting the shape of the absorption profiles. Its effect is counterbalanced by the processes of collisional depopulation of the HeI metastable state. Altogether, the observed HeI absorption in WASP-107b can be interpreted with the expected reasonable parameters of the stellar-planetary system and appropriate account of the electron and atom impact processes.

to be published

References in corpus (7)

• High-resolution confirmation of an extended helium atmosphere around WASP-107b
• Confirmation of WASP-107b's extended Helium atmosphere with Keck II/NIRSPEC
• A He I upper atmosphere around the warm Neptune GJ 3470b
• The GAPS programme at TNG XXII. The GIARPS view of the extended helium atmosphere of HD189733 b accounting for stellar activity
• Global 3D hydrodynamic modeling of in-transit Lyα absorption of GJ436b
• Three-dimensional hydrodynamic simulations of the upper atmosphere of $\pi$ Men c: comparison with Ly$\alpha$ transit observations
• Global 3D hydrodynamic modeling of absorption in Lyα and He 10830 A lines at transits of GJ3470b

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