DH Tauri

DH Tauri, also known as DH Tau, is a type M star, located 140 parsecs away. It forms a binary system with DI Tauri away, and has a substellar companion, either a brown dwarf or massive exoplanet.

Characteristics

DH Tauri is a type M, or red dwarf star, one of the most common types of star in the Milky Way. It has an apparent magnitude of 13.71 and temperature of. DH Tauri has a mass of and an estimated radius of, which is unusually large for a red dwarf.
The companion DH Tauri B or b has a mass estimated to be between and, making it either a super-Jupiter or brown dwarf. Other sources give a mass as high as, with a bolometric luminosity of. The spectral type has been classified as M7.5 or M9.25. The companion has detected water vapor and carbon monoxide in its atmosphere and has a rotational velocity of 9.6 ± 0.7 km/s. This is between 9 and 15% of the breakup speed of DH Tau B. This low rotation is in agreement with magnetic coupling to a circumplanetary disk in the late stages of accretion, which reduces angular momentum of the companion. The companion, while its host star still having a protoplanetary disk, is still accreting material, being surrounded by a circumsubstellar disk. It is potentially orbited by a smaller candidate companion DH Tauri Bb with, and a mass ratio with respect to the brown dwarf of one-tenth.