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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

Cody, Ann Marie and Stauffer, John and Rebull, Luisa M. and Carey, Sean and Hillenbrand, Lynne A. and Carpenter, John and Findeisen, Krzysztof and Plavchan, Peter (2014) 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. Astronomical Journal, 147 (4). Art. No. 82. ISSN 0004-6256.

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We present the Coordinated Synoptic Investigation of NGC 2264, a continuous 30 day multi-wavelength photometric monitoring campaign on more than 1000 young cluster members using 16 telescopes. The unprecedented combination of multi-wavelength, high-precision, high-cadence, and long-duration data opens a new window into the time domain behavior of young stellar objects. Here we provide an overview of the observations, focusing on results from Spitzer and CoRoT. The highlight of this work is detailed analysis of 162 classical T Tauri stars for which we can probe optical and mid-infrared flux variations to 1% amplitudes and sub-hour timescales. We present a morphological variability census and then use metrics of periodicity, stochasticity, and symmetry to statistically separate the light curves into seven distinct classes, which we suggest represent different physical processes and geometric effects. We provide distributions of the characteristic timescales and amplitudes and assess the fractional representation within each class. The largest category (>20%) are optical "dippers" with discrete fading events lasting ~1-5 days. The degree of correlation between the optical and infrared light curves is positive but weak; notably, the independently assigned optical and infrared morphology classes tend to be different for the same object. Assessment of flux variation behavior with respect to (circum)stellar properties reveals correlations of variability parameters with Hα emission and with effective temperature. Overall, our results point to multiple origins of young star variability, including circumstellar obscuration events, hot spots on the star and/or disk, accretion bursts, and rapid structural changes in the inner disk.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Cody, Ann Marie0000-0002-3656-6706
Stauffer, John0000-0003-3595-7382
Rebull, Luisa M.0000-0001-6381-515X
Carey, Sean0000-0002-0221-6871
Carpenter, John0000-0003-2251-0602
Plavchan, Peter0000-0002-8864-1667
Additional Information:© 2014 American Astronomical Society. Received 2013 November 12; accepted 2014 January 21; published 2014 March 13. This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech. S.H.P.A. acknowledges support from CNpq, CAPES, and Fapemig. R.G. gratefully acknowledges funding support from NASA ADAP grants NNX11AD14G and NNX13AF08G and Caltech/JPL awards 1373081, 1424329, and 1440160 in support of Spitzer Space Telescope observing programs. M.M.G. acknowledges support from INCT-A/CNPq. K.Z. received a Pegasus Marie Curie Fellowship of the Research Foundation Flanders (FWO) during part of this work and received funding from the European Research Council under the European Community’s Seventh Framework Programme (FP7/2007–2013)/ERC grant agreement No. 227224 (PROSPERITY).
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)UNSPECIFIED
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)UNSPECIFIED
Fundação de Amparo à Pesquisa do estado de Minas Gerais (FAPEMIG)UNSPECIFIED
Marie Curie FellowshipUNSPECIFIED
European Research Council (ERC)227224 (PROSPERITY)
Fonds Wetenschappelijk Onderzoek - Vlaanderen (FWO)UNSPECIFIED
Subject Keywords:accretion, accretion disks; circumstellar matter; protoplanetary disks; stars: pre-main sequence; stars: variables: T Tauri, Herbig Ae/Be; techniques: photometric
Issue or Number:4
Record Number:CaltechAUTHORS:20140501-133605186
Persistent URL:
Official Citation: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 Ann Marie Cody et al. 2014 The Astronomical Journal 147 82
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45433
Deposited By: Ruth Sustaita
Deposited On:01 May 2014 21:17
Last Modified:09 Mar 2020 13:18

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