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A study of accretion and disk diagnostics in the NGC 2264 cluster

Sousa, Alana P. and Alencar, Silvia H. P. and Rebull, Luisa M. and Espaillat, Catherine C. and Calvet, Nuria and Teixeira, Paula S. (2019) A study of accretion and disk diagnostics in the NGC 2264 cluster. Astronomy and Astrophysics, 629 . Art. No. A67. ISSN 0004-6361. https://resolver.caltech.edu/CaltechAUTHORS:20190919-125745147

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Abstract

Context. Understanding disk dissipation is essential for studying how planets form. Disk gaps and holes, which almost correspond to dust-free regions, are inferred from infrared observations of T Tauri stars (TTS), indicating the existence of a transitional phase between thick accreting disks and debris disks. Transition disks are usually referred to as candidates for newly formed planets. Aims. We searched for transition disk candidates belonging to NGC 2264. Using stellar and disk parameters obtained in the observational multiwavelength campaign CSI 2264, we characterized accretion, disk, and stellar properties of transition disk candidates and compared them to systems with a full disk and diskless stars. Methods. We modeled the spectral energy distribution (SED) of a sample of 401 TTS, observed with both CFHT equipped with MegaCam and IRAC instrument on the Spitzer, with Hyperion SED fitting code using photometric data from the U band (0.3 μm) to the Spitzer/MIPS 24 μm band. We used the SED modeling to distinguish transition disk candidates, full disk systems, and diskless stars. Results. We classified ∼52% of the sample as full disk systems, ∼41% as diskless stars, and ∼7% of the systems as transition disk candidates, among which seven systems are new transition disk candidates belonging to the NGC 2264 cluster. The sample of transition disk candidates present dust in the inner disk similar to anemic disks, according to the αIRAC classification, which shows that anemic disk systems can be candidate transition disks. We show that the presence of a dust hole in the inner disk does not stop the accretion process since 82% of transition disk candidates accrete and show Hα, UV excess, and mass accretion rates at the same level as full disk systems. We estimate the inner hole sizes, ranging from 0.1 to 78 AU, for the sample of transition disk candidates. In only ∼18% of the transition disk candidates, the hole size could be explained by X-ray photoevaporation from stellar radiation.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1051/0004-6361/201935563DOIArticle
https://arxiv.org/abs/1908.03487arXivDiscussion Paper
ORCID:
AuthorORCID
Rebull, Luisa M.0000-0001-6381-515X
Espaillat, Catherine C.0000-0001-9227-5949
Calvet, Nuria0000-0002-3950-5386
Additional Information:© 2019 ESO. Article published by EDP Sciences. Received 27 March 2019; Accepted 1 August 2019; Published online 05 September 2019. This work is based on observations made with FLAMES instrument on the Very Large Telescope under program ID 088.C-0239. APS and SHPA acknowledge support from CNPq, CAPES and Fapemig. We also thank Laura Venuti and Julia Roquette for helpful discussions. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. 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. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the U.S. Department of Energy Office of Science. The SDSS-III web site is http://www.sdss3.org. SDSS-III is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS-III Collaboration including the University of Arizona, the Brazilian Participation Group, Brookhaven National Laboratory, Carnegie Mellon University, University of Florida, the French Participation Group, the German Participation Group, Harvard University, the Instituto de Astrofisica de Canarias, the Michigan State/Notre Dame/JINA Participation Group, Johns Hopkins University, Lawrence Berkeley National Laboratory, Max Planck Institute for Astrophysics, Max Planck Institute for Extraterrestrial Physics, New Mexico State University, New York University, Ohio State University, Pennsylvania State University, University of Portsmouth, Princeton University, the Spanish Participation Group, University of Tokyo, University of Utah, Vanderbilt University, University of Virginia, University of Washington, and Yale University.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
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
NSFUNSPECIFIED
Gaia Multilateral AgreementUNSPECIFIED
NASA/JPL/CaltechUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Participating InstitutionsUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Subject Keywords:stars: pre-main sequence – stars: variables: T Tauri, Herbig Ae/Be – accretion, accretion disks – protoplanetary disks
Record Number:CaltechAUTHORS:20190919-125745147
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190919-125745147
Official Citation:A study of accretion and disk diagnostics in the NGC 2264 cluster. Alana P. Sousa, Silvia H. P. Alencar, Luisa M. Rebull, Catherine C. Espaillat, Nuria Calvet and Paula S. Teixeira. A&A, 629 (2019) A67. DOI: https://doi.org/10.1051/0004-6361/201935563
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98758
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 Sep 2019 20:14
Last Modified:03 Oct 2019 21:44

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