VLT Snaps An Exotic Exoplanet “First”.tif

VLT image of CVSO 30 and its planet, CVSO 30 c
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Orion
Right ascension 05h 25m 07.556s[1]
Declination +01° 34′ 24.349″[1]
Apparent magnitude (V) +16.26[2]
Spectral type M3[2]
Variable type T Tau[2]
Proper motion (μ) RA: +1.73[1] mas/yr
Dec.: +0.13[1] mas/yr
Parallax (π)2.861 ± 0.075[1] mas
Distance1140 ± 30 ly ly
(349.5 ± 9.2[1] pc)
Mass0.39 ± 0.05[2] M
Radius1.39[2] R
Temperature3740[2] K
Age2.65[3] Myr
Other designations
2MASS J05250755+0134243, PTFO 8-8695
Database references

CVSO 30 (PTFO 8-8695) is a binary T Tauri star, located in constellation Orion at 1200 light years from Earth away with one candidate planet called CVSO 30 c. The candidate planet is a gas giant.

Planetary system

The CVSO 30 planetary system
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
c (unconfirmed) 4.7 MJ 660 27000

CVSO 30 may have one planet called CVSO 30 c. CVSO 30 c is calculated to have a period of 27,000 years and a semimajor axis of 660 AU.

Direct imaging of the suspected CVSO 30 c, with a calculated mass equal to 4.7 Jupiter's, has been achieved through photometric and spectroscopic high contrast observations carried out with the Very Large Telescope located in Chile, the Keck Observatory in Hawaii and the Calar Alto Observatory in Spain.[4] However, the colors of the object suggest that it may actually be a background star, such as a K-type giant or a M-type subdwarf.[5]

By 2020, the phase of "dips" caused by suspected planet CVSO 30 b had drifted nearly 180 degrees from the expected value, thus ruling out the existence of the planet. Instead, a rare type of stellar starspot activity with very large starspots is now suspected. Also, CVSO 30 is suspected to be a stellar binary, with the previously reported planetary orbital period equal to the rotation period of the companion star.[6] Further investigation of "dips" by 2022 led to hypothesis of a large dust cloud close to synchronous orbit.[7]


  1. ^ a b c d e f "CVSO 30". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 5 October 2018.
  2. ^ a b c d e f Van Eyken, Julian C.; et al. (2012). "The Ptf Orion Project: A Possible Planet Transiting a T-Tauri Star". The Astrophysical Journal. 755 (1): 42. arXiv:1206.1510. Bibcode:2012ApJ...755...42V. doi:10.1088/0004-637X/755/1/42. S2CID 2753064.
  3. ^ "Extrasolar Planets Encyclopaedia". Retrieved 15 November 2016.
  4. ^ "Amazing Photo Shows Likely Alien Planet 1,200 Light-Years Away". MSN. 21 June 2016. Archived from the original on 11 August 2016. Retrieved 22 June 2016.
  5. ^ Lee, Chien-Hsiu; Chiang, Po-Shih (2018). "Evidence that the Planetary Candidate CVSO30c is a Background Star from Optical, Seeing-limited Data". The Astrophysical Journal. 852 (2): L24. arXiv:1712.08727. Bibcode:2018ApJ...852L..24L. doi:10.3847/2041-8213/aaa40b. S2CID 119270170.
  6. ^ Koen, C.; et al. (2020). "Properties of CVSO 30 from TESS measurements: Probably a binary T Tauri star with complex light curves and no obvious planets". Monthly Notices of the Royal Astronomical Society. 494 (3): 4349–4356. arXiv:2005.10253. doi:10.1093/mnras/staa1038.
  7. ^ Bischoff, R.; et al. (2022). "YETI follow-up observations of the T Tauri star CVSO 30 with transit-like dips". Monthly Notices of the Royal Astronomical Society. arXiv:2201.12405. doi:10.1093/mnras/stac293.

Further reading