Journal
ASTROPHYSICAL JOURNAL
Volume 733, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/733/1/50
Keywords
circumstellar matter; open clusters and associations: individual (Orion); stars: pre-main sequence; stars: protostars; stars: variables: general
Categories
Funding
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1009903] Funding Source: National Science Foundation
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We present initial results from time-series imaging at infrared wavelengths of 0.9 deg(2) in the Orion Nebula Cluster (ONC). During Fall 2009 we obtained 81 epochs of Spitzer 3.6 and 4.5 mu m data over 40 consecutive days. We extracted light curves with similar to 3% photometric accuracy for similar to 2000 ONC members ranging from several solar masses down to well below the hydrogen-burning mass limit. For many of the stars, we also have time-series photometry obtained at optical (I-c) and/or near-infrared (JK(s)) wavelengths. Our data set can be mined to determine stellar rotation periods, identify new pre-main-sequence eclipsing binaries, search for new substellar Orion members, and help better determine the frequency of circumstellar disks as a function of stellar mass in the ONC. Our primary focus is the unique ability of 3.6 and 4.5 mu m variability information to improve our understanding of inner disk processes and structure in the Class I and II young stellar objects (YSOs). In this paper, we provide a brief overview of the YSOVAR Orion data obtained in Fall 2009 and highlight our light curves for AA-Tau analogs-YSOs with narrow dips in flux, most probably due to disk density structures passing through our line of sight. Detailed follow-up observations are needed in order to better quantify the nature of the obscuring bodies and what this implies for the structure of the inner disks of YSOs.
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