2M0437 b, or 2MASS J04372171+2651014 b, is an extrasolar planet that orbits the red dwarf of the pre-main sequence 2MASS J04372171+2651014, 418 light-years away in the constellation of Taurus.
[3][4] The host star is a low mass red dwarf star (a mass of 0.15-0.18 solar masses) that belongs to the pre-main sequence with a temperature of 3100 K.[1] Although K2 detected a quasiperiodic dimming of nearby circumstellar dust, the star it lacks an excess infrared emission detectable from a circumstellar disk and its Hα emission is not proportional to accretion.
[6] It is a super-Jupiter-type planet with a mass of 4 or 5 times that of Jupiter, at a distance of 118 AU from its star and an age between 2 and 5 million years.
[7] Follow-up near-infrared (1-2.4 μm) spectroscopy with Subaru and Keck-1 detected carbon monoxide and possibly water vapor and methane in the atmosphere of 2M0437b.
The absence or attenuation of spectral features at shorter wavelengths suggests the presence of micron-size dust.