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CSI 2264: Characterizing Young Stars in NGC 2264 With Short-Duration Periodic Flux Dips in Their Light CurvesWe 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 (IR) excesses that are consistent with their having inner disk walls near the Keplerian corotation radius. The repeating photometric dips have FWHM generally less than one 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 on 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 YSO 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- ow accretion columns arising near the inner disk wall.
Document ID
20160005804
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
External Source(s)
doi:10.1088/0004-6256/149/4/130
Authors
Stauffer, John (California Inst. of Tech. Pasadena, CA, United States)
Cody, Ann Marie (NASA Ames Research Center Moffett Field, CA, United States)
McGinnis, Pauline (Universidade Federal de Minas Gerais Belo Horizonte, Brazil)
Rebull, Luisa (California Inst. of Tech. Pasadena, CA, United States)
Hillenbrand, Lynne A. (California Inst. of Tech. Pasadena, CA, United States)
Turner, Neal J. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Carpenter, John (California Inst. of Tech. Pasadena, CA, United States)
Plavchan, Peter (California Inst. of Tech. Pasadena, CA, United States)
Carey, Sean (California Inst. of Tech. Pasadena, CA, United States)
Terebey, Susan (California State Univ. Los Angeles, CA, United States)
Morales-Calderon, Maria (Center for Astriobiology (CSIC-INTA) Spain)
Alencar, Silvia H. P. (Universidade Federal de Minas Gerais Belo Horizonte, Brazil)
Bouvier, Jerome (Grenoble Univ. France)
Venuti, Laura (Grenoble Univ. France)
Hartmann, Lee (Michigan Univ. Ann Arbor, MI, United States)
Calvet, Nuria (Michigan Univ. Ann Arbor, MI, United States)
Micela, Giusi (Istituto di Astrofisica Spaziale e Fisica Cosmica (INAF-IASF) Palermo, Italy)
Flaccomio, Ettore (Istituto di Astrofisica Spaziale e Fisica Cosmica (INAF-IASF) Palermo, Italy)
Song, Inseok (Georgia Univ. Athens, GA, United States)
Gutermuth, Rob (Massachusetts Univ. Amherst, MA, United States)
Barrado, David (Center for Astriobiology (CSIC-INTA) Spain)
Vrba, Frederick J. (Naval Observatory Flaggstaff, AZ, United States)
Covey, Kevin (University of Western Washington Bellingham, WA, United States)
Padgett, Debbie (NASA Goddard Space Flight Center Greenbelt, MD United States)
Herbst, William (Wesleyan Univ. Middletown, CT, United States)
Gillen, Edward (Oxford Univ. Oxford, United Kingdom)
Lyra, Wladimir (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Guimaraes, Marcelo Medeiros (Universidade Federal de Sao Carlos Brazil)
Bouy, Herve (Center for Astriobiology (CSIC-INTA) Spain)
Favata, Fabio (European Space Agency Paris, France)
Date Acquired
May 4, 2016
Publication Date
January 28, 2015
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN31543
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
CSI 2264
Young
Characterizing

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