The Peculiar Periodic Young Stellar Object WL 4

Details The Peculiar Periodic Young Stellar Object WL 4 The Peculiar Periodic Young Stellar Object WL 4

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21114504p&link_type=abstract

American Astronomical Society, AAS Meeting #211, #145.04; Bulletin of the American Astronomical Society, Vol. 39, p.998

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the discovery of 65.50 day periodic near-infrared flux variability for the Class II T Tauri star WL 4 (= 2MASS J16271848-2429059, ISO-Oph 128) in Rho Ophiuchus. Our data are from the 2MASS Calibration Point Source Working Database, and constitute 1580 observations of a field in Rho Ophiuchus in J, H and Ks used to calibrate the 2MASS All-Sky Survey. We identify a light curve for WL 4 with an eclipse amplitude of 0.4 mag lasting more than half the period, and color variations in J-H and H-Ks of 0.1 mag. The long period cannot be explained by stellar rotation or a contact binary. In fact, we identify a second period of 4.84 days attributable to stellar rotation. To explain the 65.50 day period, we assume we are observing one component of a binary being eclipsed by a circum-binary 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.

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