This is a list of binary systems that have a primary star eclipsed, as seen from Earth, by a circumstellar disk around the secondary (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.
List of transiting disks +Name of the primarySpectral type primarySecondary object classificationOrbital separation (AU)Orbital period (years)Disk radius (AU)ReferenceGiant stars with possible mass transfer to the secondary in the pastAS Leonis Minoris (TYC 2505-672-1)M2IIIB-type hot subdwarf16.7–31.2 or 26.769.10.85–3.15 or 3.75Epsilon AurigaeF0II–III?B5V-star27.1VVV-WIT-08giant between K7 and M2object of unknown nature>11>0.25Eta GeminorumM3.5 Ib-IIstar (about 2 )7.88.2>0.75Gaia17bppM0IIIstar>6.51.4EE CepheiB5III (Be star)star5.60.13OGLE LMC-ECL-11893B9III: (Be star)old low-mass object1.71.30.2MWC 882A0 (accretor, post-Algol variable)B7 (donor, post-RGB)0.530.200.28 (around primary)Young systems (secondary is star)V773 Tauribinary: K3Ve (Li)binary star (two 1.5 stars)26.55Secondary possibly substellar object or planetASASSN-21jsearly-type starsubstellar object (brown dwarf or smaller)~13,000~610,0001.055ASASSN-24fwmain-sequence F-typecandidate object, or >3.42 14 or 17440.7 or 0.17Gaia21bcvK4.5V (young star)low-mass star, brown dwarf or planet<225<33750.5ASASSN-V J060000.76–310027.83early K-dwarfobject of unknown nature~82~0.5EPIC 204376071M5.3 (young star)about 3 object>0.220.012 (2.60 )V928 TauriM0.8 (young binary)substellar object with high mass (at least >50 )<3.20.18–2.80.006 (1.39 )EPIC 220208795early K-dwarf>1.5 object1.20–1.44 (aphelion)0.65–0.800.005 (1.14 )KIC 10403228M0.88 or 1.44 object4500.0012 or 0.0017 (2.6 or 3.7 )SunG2VSaturn (planet; included for comparison)29.4475HIP 41378late F-type starHIP 41378 f (12 planet, with radius of 3.7 if it has rings)1.371.490.0004 (9.6 )K2-33M dwarf (young star)K2-33b (planet)0.04090.015 (5.424 days)0.0002 (5 )
See also List of stars that have unusual dimming periods List of resolved circumstellar disks
Notes
References