YSOVAR: THE FIRST SENSITIVE, WIDE-AREA, MID-INFRARED PHOTOMETRIC MONITORING OF THE ORION NEBULA CLUSTER
By M. Morales-Calderón, J. Stauffer, L. Hillenbrand, R. Gutermuth, Inseok Song, L. Rebull, P. Plavchan, J. Carpenter, B. Whitney, K. Covey and 26 more. 2011
159 citations recorded by the source corpus.
We present initial results from time-series imaging at infrared wavelengths of 0.9 deg2 in the Orion Nebula Cluster (ONC). During Fall 2009 we obtained 81 epochs of Spitzer 3.6 and 4.5 μm data over 40 consecutive days. We extracted light curves with ∼3% photometric accuracy for ∼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 (Ic) and/or near-infrared (JKs) 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 μm 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.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/3e8d0aa0b635e539317de30fdcb21358c11c1237
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Citations in the corpus
- THE HERSCHEL ORION PROTOSTAR SURVEY: SPECTRAL ENERGY DISTRIBUTIONS AND FITS USING A GRID OF PROTOSTELLAR MODELS (2016, methodology): “…program, which monitored large samples of protostars and pre-mainsequence stars in nearby star-forming regions with Spitzer at 3.6 and 4.5 µm (Morales-Calderón et al. 2011; Cody et al. 2014; Rebull et al. 2014; Günther et al. 2014; Poppenhaeger et al. 2015; Wolk et al. 2015; Rebull et al.…”
- CSI 2264: SIMULTANEOUS OPTICAL AND INFRARED LIGHT CURVES OF YOUNG DISK-BEARING STARS IN NGC 2264 WITH CoRoT and SPITZER—EVIDENCE FOR MULTIPLE ORIGINS OF VARIABILITY (2014, background): “Morales-Calderón et al. (2011) identified similar behavior in infrared and nearinfrared time series of YSOs in Orion, likewise attributing “dipper” events to stellar occultations by regions of enhanced optical depth in a surrounding dusty disk.”
- THE SPITZER SPACE TELESCOPE SURVEY OF THE ORION A AND B MOLECULAR CLOUDS. I. A CENSUS OF DUSTY YOUNG STELLAR OBJECTS AND A STUDY OF THEIR MID-INFRARED VARIABILITY (2012, methodology): “The variability of YSOs in the IRAC bands has now been established in multi-epoch Spitzer observations of several starforming regions (Sung et al. 2009; Muzerolle et al. 2009; Morales-Calderón et al. 2011).”
- The Formation and Early Evolution of Low-Mass Stars and Brown Dwarfs (2012, methodology): “However, the number statistics for the low-mass binary measurements in Upper Sco are too low for a detailed comparison to the field, and measurements in dense clusters like the ONC are hampered by chance alignments of unrelated stars.”