This is a list of transiting circumsecondary disks (including possible ring systems). A circumsecondary disk is a disk of gas and/or dust around a star, white dwarf or substellar object that is a secondary in a star system. In rare cases the system can be aligned in a way that makes it possible for the circumsecondary disk to transit in front of the primary. In some cases the observed dips can be so deep that researchers describe these dimming events as occultations.
The object J1407b was considered a circumsecondary disk in the past, but later turned out to be more likely a free-floating planetary-mass object with a disk. PDS 110 is a candidate with uncertain status, as later eclipses did not occur. VVV-WIT-07, ASASSN-V J192543.72+402619.0, ASASSN-21co, FY Scuti, OGLE-BLG182.1.162852, and ZTF J185259.31+124955.2 are candidates without much modelling of the disk.
| Giant stars with possible mass transfer to the secondary in the past | |||||||
|---|---|---|---|---|---|---|---|
| TYC 2505-672-1 | M2III | B-type hot subdwarf | 16.7–31.2 or 26.7 | 69.1 | 0.85–3.15 or 3.75 | ||
| Epsilon Aurigae | F0II–III? | B5V-star | 27.1 | ||||
| VVV-WIT-08 | giant between K7 and M2 | object of unknown nature | >11 | >0.25 | |||
| Eta Geminorum | M3.5 Ib-II | star (about 2) | 7.8 | 8.2 | >0.75 | ||
| Gaia17bpp | M0III | star | >6.5 | 1.4 | |||
| EE Cephei | B5III (Be star) | star | 5.6 | 0.13 | |||
| OGLE LMC-ECL-11893 | B9III: (Be star) | old low-mass object | 1.7 | 1.3 | 0.2 | ||
| MWC 882 | A0 (accretor, post-Algol variable) | B7 (donor, post-RGB) | 0.53 | 0.20 | 0.28 (around primary) | ||
| Young systems (secondary is star) | |||||||
| V773 Tauri | binary: K3Ve (Li) | binary star (two 1.5 stars) | 26.5 | 5 | |||
| Secondary possibly substellar object or planet | |||||||
| ASASSN-21js | early-type star | substellar object (brown dwarf or smaller) | ~13,000 | ~610,000 | 1.055 | ||
| Gaia21bcv | K4.5V (young star) | low-mass star, brown dwarf or planet | <225 | <3375 | 0.5 | ||
| ASASSN-V J060000.76–310027.83 | early K-dwarf | object of unknown nature | ~82 | ~0.5 | |||
| EPIC 204376071 | M5.3 (young star) | about 3 object | >0.22 | 0.012 (2.60) | |||
| V928 Tauri | M0.8 (young binary) | substellar object with high mass (at least >50) | <3.2 | 0.18–2.8 | 0.006 (1.39) | ||
| EPIC 220208795 | early K-dwarf | >1.5 object | 1.20–1.44 (aphelion) | 0.65–0.80 | 0.005 (1.14) | ||
| KIC 10403228 | M | 0.88 or 1.44 object | 450 | 0.0012 or 0.0017 (2.6 or 3.7) | |||
| Sun | G2V | Planet (Saturn, for comparison) | 1433.534NaN4 | 29.4475 | 1367805NaN5 | < | ---Saturn rings---> |
| HIP 41378 | late F-type star | HIP 41378 f (12 planet, with radius of 3.7 if it has rings) | 1.37 | 1.49 | 0.0004 (9.6) | ||
| K2-33 | M dwarf (young star) | K2-33b (planet) | 0.0409 | 0.015 (5.424 days) | 0.0002 (5) | ||