WISE Discovery of Mid-infrared Variability in Massive Young Stellar Objects

Abstract

We systematically investigate the mid-infrared (MIR; $\lambda >3\mu$m) time variability of uniformly selected $\sim 800$ massive young stellar objects (MYSOs) from the Red MSX Source (RMS) survey. Out of the 806 sources, we obtain reliable 9-year-long MIR magnitude variability data of 331 sources at the 3.4~$\mu$m (W1) and 4.6~$\mu$m (W2) bands by cross-matching the MYSO positions with ALLWISE and NEOWISE catalogs. After applying the variability selections using ALLWISE data, we identify 5 MIR-variable candidates. The light curves show various classes, with the periodic, plateau-like, and dipper features. Out of the obtained two color-magnitude diagram of W1 and W1$-$W2, one shows "bluer when brighter and redder when fainter" trends in variability, suggesting change in extinction or accretion rate. Finally, our results show that G335.9960$-$00.8532 (hereafter, G335) has a periodic light curve, with a $\approx 690$-day cycle. Spectral energy density model fitting results indicate that G335 is a relatively evolved MYSO; thus, we may be witnessing the very early stages of a hyper- or ultra-compact HII region, a key source for understanding MYSO evolution.

arXiv comment12 pages, 5 figures, 3 tables. Accepted by ApJ

References in corpus (38)

• Astropy: A Community Python Package for Astronomy
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Dust Grain Size Distributions and Extinction in the Milky Way, LMC, and SMC
• Understanding the Lomb-Scargle Periodogram
• Toward Understanding Massive Star Formation
• Preliminary Results from NEOWISE: An Enhancement to the Wide-field Infrared Survey Explorer for Solar System Science
• Interpreting Spectral Energy Distributions from Young Stellar Objects. II. Fitting observed SEDs using a large grid of pre-computed models
• Initial Performance of the NEOWISE Reactivation Mission
• Evolution of Massive Protostars with High Accretion Rates
• CSI 2264: Simultaneous optical and infrared light curves of young disk-bearing stars in NGC 2264 with CoRoT and Spitzer-- evidence for multiple origins of variability
• X-Shooter spectroscopy of young stellar objects: IV -- Accretion in low-mass stars and sub-stellar objects in Lupus
• A spectroscopic survey on the multiplicity of high-mass stars
• The Red MSX Source Survey: the Massive Young Stellar Population of our Galaxy
• Evolution of Dust in Primordial Supernova Remnants: Can Dust Grains Formed in the Ejecta Survive and be Injected into the Early Interstellar Medium?
• Hi-GAL, the Herschel infrared Galactic Plane Survey: photometric maps and compact source catalogues. First data release for Inner Milky Way: +68°> l > -70°
• YSOVAR: the first sensitive, wide-area, mid-IR photometric monitoring of the ONC
• Results of the ROTOR-program. I. The long-term photometric variability of classical T Tauri stars
• The RMS Survey: 6 cm continuum VLA observations towards candidate massive YSOs in the northern hemisphere
• The Population of the Galactic Plane as Seen by MSX
• The RMS Survey: Radio observations of candidate massive YSOs in the southern hemisphere
• The Complete Infrared View of Active Galactic Nuclei from the 70-month Swift/BAT Catalog
• Young Stellar Object Variability (YSOVAR): Long Timescale Variations in the Mid-Infrared
• Mid and Far Infrared Properties of a Complete Sample of Local AGNs
• Quasi-Periodic Formaldehyde Maser Flares in the Massive Protostellar Object IRAS18566+0408
• The RMS Survey: ${}^{13}$CO observations of candidate massive YSOs in the northern Galactic plane
• Direct diagnostics of forming massive stars: stellar pulsation and periodic variability of maser sources
• Massive Outflows Driven by Magnetic Effects in Star Forming Clouds with High Mass Accretion Rates
• A String of Radio Emission Associated with IRAS 16562-3959: A Collimated Jet Emanating from a Luminous Massive YSO
• Burst occurrence in young massive stellar objects
• Periodicity in Class II methanol masers in high mass star forming regions
• What Sets the Initial Rotation Rates of Massive Stars?
• YSOVAR: Mid-IR variability in the star forming region Lynds 1688
• Spitzer-IRAC GLIMPSE of high mass protostellar objects II - SED modelling of a bonafide sample
• Modeling the Infrared Interstellar Extinction
• The shortest periodic and flaring flux variability of a methanol maser emission at 6.7 GHz in G 014.23-00.50
• Accelerating a water maser face-on jet from a high mass young stellar object
• Photometric variability of massive young stellar objects. I
• Highly variable young massive stars in ATLASGAL clumps

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