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American Astronomical Society, Astrophysical Journal, 1(788), p. 41, 2014

DOI: 10.1088/0004-637x/788/1/41

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OGLE-LMC-ECL-11893: The discovery of a long-period eclipsing binary with a circumstellar disk

Journal article published in 2014 by Subo Dong ORCID, Boaz Katz ORCID, Jose L. Prieto ORCID, Andrzej Udalski, Szymon Kozlowski ORCID, R. A. Street ORCID, D. M. Bramich, Y. Tsapras, M. Hundertmark ORCID, C. Snodgrass ORCID, K. Horne, M. Dominik ORCID, RoboNet Collaboration, R. Figuera Jaimes
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

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 Δ 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.