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

Abstract

The emission from young stellar objects (YSOs) in the mid-IR is dominated by the inner rim of their circumstellar disks. We present an IR-monitoring survey of about 800 objects in the direction of the Lynds 1688 (L1688) star forming region over four visibility windows spanning 1.6 years using the \emph{Spitzer} space telescope in its warm mission phase. Among all lightcurves, 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 lightcurves 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 years. Non-periodic lightcurves often still show a preferred timescale of variability which 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 towards 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.

accepted by ApJ, 24 pages, 17 figures

References in corpus (18)

• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• A Spitzer Survey of Young Stellar Clusters within One Kiloparsec of the Sun: Cluster Core Extraction and Basic Structural Analysis
• The WFCAM Science Archive
• A Submillimeter View of Circumstellar Dust Disks in $\rho$ Ophiuchus
• Results of the ROTOR-program. I. The long-term photometric variability of classical T Tauri stars
• Hipparcos distances of Ophiuchus and Lupus cloud complexes
• Current Star Formation in the Ophiuchus and Perseus Molecular Clouds: Constraints and Comparisons from Unbiased Submillimeter and Mid-Infrared Surveys. II
• The nature of the Class I population in Ophiuchus as revealed through gas and dust mapping
• Young Stellar Object Variability (YSOVAR): Long Timescale Variations in the Mid-Infrared
• The Spitzer c2d Survey of Large, Nearby, Interstellar Clouds: VII. Ophiuchus Observed with MIPS
• The HD 163296 Circumstellar Disk in Scattered Light: Evidence of Time-Variable Self-Shadowing
• 3D MHD Simulations of Planet Migration in Turbulent Stratified Disks
• Photometric variability of the T Tauri star TW Hya on time scales of hours to years
• Oscillations of MHD shock waves on the surfaces of T Tauri stars
• Deep near-IR variability survey of pre-main-sequence stars in Rho Ophiuchi
• The Peculiar Periodic YSO WL 4 in Rho Ophiuchus
• Where are the hot ion lines in classical T Tauri stars formed?
• Accretion, jets and winds: High-energy emission from young stellar objects

Cited by in corpus (19)

• A modular set of synthetic spectral energy distributions for young stellar objects
• Quantifying Variability of YSOs in the Mid-IR Over Six Years with NEOWISE
• A continuum of accretion burst behavior in young stars observed by K2
• A Survey for New Stars and Brown Dwarfs in the Ophiuchus Star-forming Complex
• The Relationship between Mid-Infrared and Sub-Millimetre Variability of Deeply Embedded Protostars
• Using FUV to IR Variability to Probe the Star-Disk Connection in the Transitional Disk of GM Aur
• Multicolor Variability of Young Stars in the Lagoon Nebula: Driving Causes and Intrinsic Timescales
• A "Rosetta Stone" for protoplanetary disks: The synergy of multi-wavelength observations
• Spitzer Observations of Long Term Infrared Variability Among Young Stellar Objects in Chamaeleon I
• A ZTF Look at Optical Variability of Young Stellar Objects in the North America and Pelican Nebulae Complex
• Persistent and occasional: searching for the variable population of the ZTF/4MOST sky using ZTF data release 11
• ALMA Discovery of a Disk around the Planetary-mass Companion SR 12 c
• $12660$ spotted stars toward the OGLE Galactic bulge fields
• A Mid-Infrared Study of Directly-Imaged Planetary-Mass Companions using Archival Spitzer/IRAC Images
• Near-Infrared Variability of Low Mass Stars in IC 1396A and TR 37
• Disc light variability in the FUor star V646 Puppis as observed by TESS and from the ground
• Time-dependent Monte Carlo continuum radiative transfer
• The Nature of Class I Sources: Periodic Variables in Orion
• Census of Variable Stars toward Serpens Main