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The Peculiar Periodic YSO WL 4 in ρ Ophiuchus

Peter PlavchanInfrared Processing and Analysis Center, California Institute of Technology, M/C 100-22, 770 South Wilson Avenue, Pasadena, CA 91125Alan H. GeeInfrared Processing and Analysis Center, California Institute of Technology, M/C 100-22, 770 South Wilson Avenue, Pasadena, CA 91125Karl R. StapelfeldtJet Propulsion Laboratory, California Institute of Technology, MS 183-900, 4800 Oak Grove Drive, Pasadena, CA 91109A. C. BeckerAstronomy Department, University of Washington, Seattle, WA 98195

2008en

ABI

Annotatsiya

We present the discovery of 130.87 day periodic near-infrared flux variability for the Class II T Tauri star WL 4 (=2MASS J16271848–2429059, ISO-Oph 128). Our data are from the 2MASS Calibration Point Source Working Database and constitute 1580 observations in J, H, and K_s of a field in ρ Ophiuchus used to calibrate the 2MASS All-Sky Survey. We identify a light curve for WL 4 with eclipse amplitudes of ~0.4 mag lasting more than one-quarter the period and color variations in J–H and H–Ks of ~0.1 mag. The long period cannot be explained by stellar rotation. We propose that WL 4 is a triple YSO system, with an inner binary orbital period of 130.87 days. We posulate that we are observing each component of the inner binary alternately being eclipsed by a circumbinary disk with respect to our line of sight. This system will be useful in investigating terrestrial-zone YSO disk properties and dynamics at ~1 Myr.\n

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DOI: 10.1086/592107

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