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YSOVAR: Mid-IR variability in the star forming region Lynds 1688

Günther, H. M. and Cody, A. M. and Covey, K. R. and Hillenbrand, L. A. and Plavchan, P. and Poppenhaeger, K. and Rebull, L. M. and Stauffer, J. R. and Wolk, S. J. and Allen, L. and Bayo, A. and Gutermuth, R. A. and Hora, J. L. and Meng, H. Y. A. and Morales-Calderón, M. and Parks, J. R. and Song, Inseok (2014) YSOVAR: Mid-IR variability in the star forming region Lynds 1688. Astronomical Journal, 148 (6). Art. No. 122. ISSN 0004-6256.

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The emission from young stellar objects (YSOs) in the mid-infrared (mid-IR) is dominated by the inner rim of their circumstellar disks. We present IR data from the Young Stellar Object VARiability (YSOVAR) survey of ~800 objects in the direction of the Lynds 1688 (L1688) star-forming region over four visibility windows spanning 1.6 yr using the Spitzer Space Telescope in its warm mission phase. Among all light curves, 57 sources are cluster members identified based on their spectral energy distribution and X-ray emission. Almost all cluster members show significant variability. The amplitude of the variability is larger in more embedded YSOs. Ten out of 57 cluster members have periodic variations in the light curves with periods typically between three and seven days, but even for those sources, significant variability in addition to the periodic signal can be seen. No period is stable over 1.6 yr. Nonperiodic light curves often still show a preferred timescale of variability that is longer for more embedded sources. About half of all sources exhibit redder colors in a fainter state. This is compatible with time-variable absorption toward the YSO. The other half becomes bluer when fainter. These colors can only be explained with significant changes in the structure of the inner disk. No relation between mid-IR variability and stellar effective temperature or X-ray spectrum is found.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Cody, A. M.0000-0002-3656-6706
Covey, K. R.0000-0001-6914-7797
Plavchan, P.0000-0002-8864-1667
Rebull, L. M.0000-0001-6381-515X
Stauffer, J. R.0000-0003-3595-7382
Wolk, S. J.0000-0002-0826-9261
Gutermuth, R. A.0000-0002-6447-899X
Hora, J. L.0000-0002-5599-4650
Song, Inseok0000-0002-5815-7372
Additional Information:© 2014 American Astronomical Society. Received 2014 May 6; accepted 2014 August 12; published 2014 November 7. 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 made use of Astropy, a community-developed core Python package for astronomy (The Astropy Collaboration et al. 2013). This research has made use of the SIMBAD database and the VizieR catalogue access tool (Ochsenbein et al. 2000), both operated at CDS, Strasbourg, France, and 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. H.M.G. acknowledges Spitzer grant 1490851. H.Y.A.M. and P.P. acknowledge support by the IPAC Visiting Graduate Fellowship program at Caltech/IPAC. P.P. also acknowledges the JPL Research and Technology Development and Exoplanet Exploration programs. R.A.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. S.J.W. was supported by NASA contract NAS8-03060. Facilities: Spitzer, CXO
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Caltech/IPAC Visiting Graduate FellowshipUNSPECIFIED
Subject Keywords:accretion, accretion disks; stars: formation; stars: pre-main sequence; stars: protostars; stars: variables: T Tauri, Herbig Ae/Be
Issue or Number:6
Record Number:CaltechAUTHORS:20150106-153421629
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Official Citation:YSOVAR: Mid-infrared Variability in the Star-forming Region Lynds 1688 H. M. Günther et al. 2014 The Astronomical Journal 148 122
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:53227
Deposited By: Ruth Sustaita
Deposited On:07 Jan 2015 00:41
Last Modified:14 Nov 2019 00:19

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