Non-detection of Helium in the upper atmospheres of TRAPPIST-1b, e and f

Vigneshwaran Krishnamurthy, Teruyuki Hirano, Guðmundur Stefánsson +37

We obtained high-resolution spectra of the ultra-cool M-dwarf TRAPPIST-1 during the transit of its planet `b' using two high dispersion near-infrared spectrographs, IRD instrument…