J/ApJ/955/69ivo://CDS.VizieR/J/ApJ/955/69CDSTzanidakis A.Davenport J.R.A.Bellm E.C.Wang Y.2026-03-02T06:25:50Z2026-01-07T08:21:13ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frmultiple-starsphotometryvisible-astronomyinfrared-astronomyWe report the serendipitous discovery of Gaia17bpp / 2MASS_J19372316+1759029, a binary star with a deep single large-amplitude dimming event of ~4.5mag that lasted over 6.5yr. Using the optical-to-IR spectral energy distribution (SED), we constrain the primary star to be a cool giant M0III star with effective temperature Teff=3850K and radius R=58R_{sun}_. Based on the SED fitting, we obtained a bimodal posterior distribution of primary stellar masses with a stronger preference for a 1.5M_{sun}_ mass star. Within the last 66yr of photometric coverage, no other significant dimming events of this depth and duration were identified in the optical light curves. Using a Gaussian process, we fit a generalized Gaussian distribution to the optical and IR light curves and conclude that the dimming event exhibits moderate asymmetries from optical to IR. At the minimum of the dimming event, the Wide- field Infrared Survey Explorer color (W1-W2) differed by ~0.2mag relative to the primary star color outside the dimming event. The ingress and egress colors show a shallow reddening profile. We suggest that the main culprit of the dimming event is likely due to the presence of a large, optically thick disk transiting the primary giant star. By fitting a monochromatic transit model of an oblate disk transiting a star, we found good agreement with a slow-moving (0.005km/s) disk with a ~1.4au radius. We propose that Gaia17bpp belongs to a rare binary star population similar to the {epsilon} Aurigae system, which consists of a secondary star enshrouded by an optically thick debris disk.2023ApJ...955...69Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/955/69CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/284 : The USNO-B1.0 Catalog (Monet+ 2003)I/324 : The Initial Gaia Source List (IGSL) (Smart, 2013)I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021)I/357 : Gaia DR3 Part 3. Non-single stars (Gaia Collaboration, 2022)J/A+A/539/A51 : Catalogue enriched with R CrB stars (Tisserand, 2012)J/ApJ/792/30 : NEOWISE magnitudes for near-Earth objects (Mainzer+, 2014)J/AJ/147/9 : VRIJHK light curves of V582 Mon (Windemuth+, 2014)J/AJ/151/90 : Spitzer & VRIJHK photometry of V582 Mon (Arulanantham+, 2016)J/A+A/605/A111 : Surface rotation of Kepler red giant stars (Ceillier+, 2017)J/AJ/156/71 : K2 C2: young disk-bearing stars in Sco & Oph (Cody+, 2018)J/A+A/635/A14 : New R Coronae Borealis stars (Tisserand+, 2020)J/A+A/652/A76 : Gaia Photometric Science Alerts (Hodgkin+, 2021)J/A+A/649/A3 : Gaia EDR3 photometric passbands (Riello+, 2021)J/MNRAS/513/2719 : Stellar parameters study with SED fit algo (Vines+, 2022)J/ApJ/933/L21 : g and i bands LCs of Bernhard-2 star (Zhu+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/955/69https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/955/69http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/955/69https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/955/69https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/955/69http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/955/69GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/ApJ/955/69/fig3Historical optical-NIR light curve of Gaia17bpprecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[55306.09/59739.9] Modified Julian Datedtime.epochdoublemag[9.6/21.1] Apparent magnitude in Filtermagphot.magfloate_mag[0.002/0.4] Uncertainty in magmagstat.error;phot.magfloatFilterFilter usedinstr.setup;instr.filterchar