CI Tauri
CI Tauri is a young star, about 2 million years old, located approximately 500 light years away in the constellation Taurus. In 2016 a planet, CI Tauri b, was discovered orbiting it, and in 2018 the possible detection of three more planets (inferred by gaps in the protoplanetary disk surrounding the star) was announced.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 33m 52.01444s[1] |
| Declination | +22° 50′ 30.0937″[1] |
| Apparent magnitude (V) | 13.8[1] |
| Characteristics | |
| Spectral type | K4IVe [1] |
| Variable type | T Tauri |
| Astrometry | |
| Radial velocity (Rv) | +16.2[1] km/s |
| Proper motion (μ) | RA: +8.904[1] mas/yr Dec.: –17.067[1] mas/yr |
| Parallax (π) | 6.3008 ± 0.473[1] mas |
| Distance | 520 ± 40 ly (160 ± 10 pc) |
| Details | |
| Mass | 0.80 ± 0.02[2] M☉ |
| Age | .0020[2] Gyr |
| Other designations | |
CI Tau, 2MASS J04335200+2250301, EPIC 247584113[1] | |
| Database references | |
| SIMBAD | data |
CI Tauri b
The discovery of CI Tauri b was notable because it is a hot Jupiter, which are supposed to take a minimum of 10 million years to form, and are often thought to be too close to their parent stars to have formed there.[3][4] It is about 12 times the mass of Jupiter and completes each orbit in 9 days.[2]
2018 discovery
Using the Atacama Large Millimeter Array (ALMA) to look for 'siblings' of CI Tauri b, a team of researchers detected three distinct gaps in the protoplanetary disk which their theoretical modelling suggests are caused by three other planets. The two outer planets are believed to be about the mass of Saturn, while the inner planet's mass is around the same as CI Tauri b.[4] Two of the new planets are similarly located to those inferred in the HL Tauri protoplanetary disk.[5]
If this discovery is confirmed this would be the most massive collection of exoplanets ever detected at this age with its four planets spanning a factor of a thousand in orbital radius.[5]
References
- "V* CI Tau -- T Tau-type Star". SIMBAD. Retrieved 19 October 2018.
- "CI Tau". Open Exoplanet Catalogue. Retrieved 20 October 2018.
- "Astronomers find giant planet around very young star CI Tauri". Astronomy Now. Retrieved 20 October 2018.
- "Giant planets around young star raise questions about how planets form". University of Cambridge. 2018-10-15. Retrieved 20 October 2018.
- Clarke, Cathie J; Tazzari, Marco; Juhasz, Attila; Rosotti, Giovanni; Booth, Richard; Facchini, Stefano; Ilee, John D; Johns-Krull, Christopher M; Kama, Mihkel; Meru, Farzana; Prato, Lisa (2018). "High resolution millimetre imaging of the CI Tau protoplanetary disc - a massive ensemble of protoplanets from 0.1 - 100 au". The Astrophysical Journal. 866: L6. arXiv:1809.08147. doi:10.3847/2041-8213/aae36b.