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CSI 2264: Characterizing Young Stars in NGC 2264 With Short-Duration Periodic Flux Dips in Their Light Curves

Stauffer, John and Cody, Ann Marie and Rebull, Luisa and Plavchan, Peter and Carey, Sean and Hillenbrand, Lynne A. and Carpenter, John (2015) CSI 2264: Characterizing Young Stars in NGC 2264 With Short-Duration Periodic Flux Dips in Their Light Curves. Astronomical Journal, 149 (4). Art. No. 130. ISSN 0004-6256. https://resolver.caltech.edu/CaltechAUTHORS:20150501-111306799

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Abstract

We identify nine young stellar objects (YSOs) in the NGC 2264 star-forming region with optical CoRoT light curves exhibiting short-duration, shallow periodic flux dips. All of these stars have infrared excesses that are consistent with their having inner disk walls near the Keplerian co-rotation radius. The repeating photometric dips have FWHMs generally less than 1 day, depths almost always less than 15%, and periods (3 < P < 11 days) consistent with dust near the Keplerian co-rotation period. The flux dips vary considerably in their depth from epoch to epoch, but usually persist for several weeks and, in two cases, were present in data collected in successive years. For several of these stars, we also measure the photospheric rotation period and find that the rotation and dip periods are the same, as predicted by standard "disk-locking" models. We attribute these flux dips to clumps of material in or near the inner disk wall, passing through our line of sight to the stellar photosphere. In some cases, these dips are also present in simultaneous Spitzer IRAC light curves at 3.6 and 4.5 microns. We characterize the properties of these dips, and compare the stars with light curves exhibiting this behavior to other classes of YSOs in NGC 2264. A number of physical mechanisms could locally increase the dust scale height near the inner disk wall, and we discuss several of those mechanisms; the most plausible mechanisms are either a disk warp due to interaction with the stellar magnetic field or dust entrained in funnel-flow accretion columns arising near the inner disk wall.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-6256/149/4/130DOIArticle
http://iopscience.iop.org/1538-3881/149/4/130/PublisherArticle
http://arxiv.org/abs/1501.06609arXivDiscussion Paper
ORCID:
AuthorORCID
Stauffer, John0000-0003-3595-7382
Cody, Ann Marie0000-0002-3656-6706
Rebull, Luisa0000-0001-6381-515X
Plavchan, Peter0000-0002-8864-1667
Carey, Sean0000-0002-0221-6871
Carpenter, John0000-0003-2251-0602
Additional Information:© 2015 American Astronomical Society. Received 2014 December 1; accepted 2015 January 23; published 2015 March 16. This work is based 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. This research was carried out in part at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration and with the support of the NASA Origins of Solar Systems program via grant 11-OSS11-0074. 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. SHPA and PTM acknowledge support from CNPq, CAPES and Fapemig. Facilities: Spitzer (IRAC), CFHT (MegaCam), VLT: Kueyen.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NASA/JPL/CaltechUNSPECIFIED
NASA11-OSS11-0074
NASANNX11AD14G
NASANNX13AF08G
Caltech/JPL1373081
Caltech/JPL1424329
Caltech/JPL1440160
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
Subject Keywords:circumstellar matter; open clusters and associations: individual (NGC 2264); stars: pre-main sequence; stars: variables: T Tauri, Herbig Ae/Be
Issue or Number:4
Record Number:CaltechAUTHORS:20150501-111306799
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150501-111306799
Official Citation:CSI 2264: Characterizing Young Stars in NGC 2264 With Short-Duration Periodic Flux Dips in Their Light Curves John Stauffer et al. 2015 The Astronomical Journal 149 130
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57151
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:01 May 2015 18:48
Last Modified:09 Mar 2020 13:18

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