OGLE-LMC-ECL-11893: The discovery of a long-period eclipsing binary with   a circumstellar disk
  We report the serendipitous discovery of a disk-eclipse system OGLE-LMC-ECL-11893. The eclipse occurs with a period of 468 days, a duration of about 15 days and a deep (up to \Delta I ~1.5), peculiar and asymmetric profile. A possible origin of such an eclipse profile involves a circumstellar disk. The presence of the disk is confirmed by the H-alpha line profile from the follow-up spectroscopic observations, and the star is identified as Be/Ae type. Unlike the previously known disk-eclipse candidates (Epsilon Aurigae, EE Cephei, OGLE-LMC-ECL-17782, KH 15D), the eclipses of OGLE-LMC-ECL-11893 retain the same shape throughout the span of ~17 years (13 orbital periods), indicating no measurable orbital precession of the disk. 
Subo Dong (KIAA-PKU), Boaz Katz (IAS), Jose L. Prieto (Princeton),   Andrzej Udalski (Warsaw), Szymon Kozlowski (Warsaw), R....
astro-ph.SR astro-ph.EP