Shock emission from gas accreting onto PDS 70 b should make the Br-alpha line detectable with ELT/METIS in about 15 minutes, with a narrow, asymmetric profile that can constrain planet mass and radius.
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Detectability of resolved hydrogen lines from the accretion shock at gas giants and their CPDs
Shock emission from gas accreting onto PDS 70 b should make the Br-alpha line detectable with ELT/METIS in about 15 minutes, with a narrow, asymmetric profile that can constrain planet mass and radius.