Discovery of an unusual bright eclipsing binary with the longest known period: TYC 2505-672-1 / MASTER OT J095310.04+335352.8

Abstract

We report on the MASTER Global Robotic Net discovery of an eclipsing binary, MASTER OT J095310.04+335352.8, previously known as unremarkable star TYC 2505-672-1, which displays extreme orbital parameters. The orbital period P=69.1 yr is more than 2.5 times longer than that of epsilon-Aurigae, which is the previous record holder. The light curve is characterized by an extremely deep total eclipse with a depth of more than 4.5 mag, which is symmetrically shaped and has a total duration of 3.5 yrs. The eclipse is essentially gray. The spectra acquired with the Russian 6 m BTA telescope both at minimum and maximum light mainly correspond to an M0-1III--type red giant, but the spectra taken at the bottom of eclipse show small traces of a sufficiently hot source. The observed properties of this system can be better explained as the red giant eclipsed by a large cloud (the disk) of small particles surrounding the invisible secondary companion.

arXiv comment8 figures, 9 pages, Astronomy and astrophysics in print

References in corpus (14)

• The USNO-B Catalog
• The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)
• Northern Sky Variability Survey (NSVS): Public data release
• The SCORPIO focal reducer
• Predicting alpha Comae Berenices Time of Eclipse II: How 3 Faulty Measurements Out of 609 Caused A 26 Year Binary's Eclipse To Be Missed
• All-Sky spectrally matched UBVRI-ZY and u'g'r'i'z' magnitudes for stars in the Tycho2 catalog
• The Evolution of Wide Binary Stars
• Robotic optical telescopes global network MASTER II. Equipment, structure, algorithms
• The MASTER-II Network of Robotic Optical Telescopes. First Results
• MASTER: The Mobile Astronomical System of Telescope-Robots
• Optical Observations of Gamma-Ray Bursts, the Discovery of Supernovae 2005bv, 2005ee, and 2006ak, and Searches for Transients Using the "MASTER" Robotic Telescope
• The Invisible Monster Has Two Faces: Observations of Epsilon Aurigae with the Herschel Space Observatory
• Interferometric Studies of the extreme binary, $\epsilon$ Aurigae: Pre-eclipse Observations
• A new look at the long-period eclipsing binary V383 Sco

Cited by in corpus (18)

• Transient Double-beam Spectrograph for the 2.5-m Telescope of the Caucasus Mountain Observatory of SAI MSU
• First Gravitational-Wave Burst GW150914: Part II. MASTER Optical Follow-Up Observations
• Our Sky now and then $-$ searches for lost stars and impossible effects as probes of advanced extra-terrestrial civilisations
• Smooth optical self similar emission of gamma-ray bursts
• VVV-WIT-08: the giant star that blinked
• Orphan optical flare as SOSS emission afterglow, localization in time
• Phase-dependent photometric and spectroscopic characterization of the MASTER-Net Optical Transient J212444.87+321738.3: an oxygen rich Mira
• Eta Geminorum: An Eclipsing Semiregular Variable Star Orbited by a Companion Surrounded by an Extended Disc
• Three-stage Collapse of the Long Gamma-Ray Burst from GRB 160625B Prompt Multiwavelength Observations
• ASASSN-21js: A multi-year transit of a ringed disc
• Observations of Near-Earth Optical Transients with the Lomonosov Space Observatory
• International observational campaign of the 2014 eclipse of EE Cep
• A search for transiting companions in the J1407 (V1400 Cen) system
• Synergies between Exoplanet Surveys and Variable Star Research
• Variable Red Giants Exploration with MASTER Robotic Net: Main Algorithms and Study of Three Mira-type Targets
• On the discovery of K I 7699 A line strength variation during the 1982 - 1984 eclipse of Epsilon Aurigae
• WISE J005128.08+645651.7: An enigmatic R Coronae Borealis star
• Comprehensive analysis of a symbiotic candidate V503 Her