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GK Tauri is a youngT Tauri-typepre-main sequence star in the constellation ofTaurus about421 light years away, belonging to theTaurus Molecular Cloud.
The stars GK Tauri and GI Tauri form a wide binary system, with the projected separation between components being 1700AU. The secondary component's orbit is not very eccentric, with a periastron of at least 890AU.[5]
GK Tauri was originally believed to have a close stellar companion WDS J04336+2421Ab.[7] However, it was found to be an unrelated background star according toGaia data.[8]
Both members of the binary system are medium-mass objects still contracting towards themain sequence and accreting mass, with the primary GK Tauri being close to entering the main sequence.[4][5]
Both stars are surrounded by compactprotoplanetary disks, although the reason for the small disk sizes is not clear.[5] GK Tauri's spectrum indicates a possible gap in the protoplanetary disk and a planet orbiting within the gap, with a semimajor axis of 2.4+1.5
−1.0AU.[4]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| protoplanetary disk | 0–19AU | 40.2+5.9 −6.2° | — | |||
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| protoplanetary disk | 0–25AU | 43.8±1.1° | — | |||
