J/ApJ/933/L21ivo://CDS.VizieR/J/ApJ/933/L21doi:10.26093/cds/vizier.19339021CDSZhu W.Bernhard K.Dai F.Fang M.Zanazzi J.J.Zang W.Dong S.,Hambsch F.-J.Gan T.Wu Z.Poon M.2025-05-19T20:10:29Z2025-03-24T15:10:54ZCDS support team

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

cds-question@unistra.frinfrared-photometryvisible-astronomybroad-band-photometryvariable-starsyoung-stellar-objectsKH 15D contains a circumbinary disk that is tilted relative to the orbital plane of the central binary. The precession of the disk and the orbital motion of the binary together produce rich phenomena in the photometric light curve. In this work, we present the discovery and preliminary analysis of two objects that resemble the key features of KH 15D from the Zwicky Transient Facility. These new objects, Bernhard-1 and Bernhard-2, show large-amplitude ( >1.5 mag), long-duration (more than tens of days), and periodic dimming events. A one-sided screen model is developed to model the photometric behavior of these objects, the physical interpretation of which is a tilted, warped circumbinary disk occulting the inner binary. Changes in the object light curves suggest potential precession periods over timescales longer than 10yr. Additional photometric and spectroscopic observations are encouraged to better understand the nature of these interesting systems.2022ApJ...933L..21Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/933/L21CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/350 : Gaia EDR3 (Gaia Collaboration, 2020)VII/233 : 2MASS All-Sky Extended Source Cat. (XSC) (IPAC/UMass, 2003-2006)J/AJ/140/2025 : KH 15D (V582 Mon) VI light curves (Herbst+, 2010)J/ApJS/208/9 : Intrinsic colors and temp. of PMS stars (Pecaut+, 2013)J/AJ/147/9 : VRIJHK light curves of V582 Mon (Windemuth+, 2014)J/ApJ/788/41 : BVRI light curve of OGLE LMC-ECL-11893 (Dong+, 2014)J/AJ/151/90 : Spitzer and VRIJHK phot. of V582 Mon (Arulanantham+, 2016)J/AJ/153/188 : Spectro. of the foreground popul. in Orion A (Fang+, 2017)J/AJ/155/47 : VRIJHK phot. of the T Tauri binary KH 15D (Aronow+, 2018)J/ApJ/854/109 : Photometry & spectroscopy follow-up of MWC 882 (Zhou+, 2018)J/ApJS/249/18 : The ZTF catalog of periodic variable stars (Chen+, 2020)J/AJ/159/135 : VRIJHK light curves of V582 Mon (Garcia Soto+, 2020)J/MNRAS/508/2370 : Revisiting the Cygnus OB associations (Quintana+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/933/L21https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/933/L21http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/933/L21https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/933/L21https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/933/L21http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/933/L21GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/ApJ/933/L21/fig5LCOGT observations of Bernhard-2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJulian date of observationdtime.epochdoubleomag[16.47/21.48] Observed magnitude in Filtermagphot.magdoublee_omag[0.007/0.627] Uncertainty in omagmagstat.error;phot.magdoubleFilterFilter (1)meta.id;instr.filtercharObsObservatory (2)meta.id;instr.obstychar