WISE Discovery of Mid-infrared Variability in Massive Young Stellar Objects
| Autor: | Mizuho Uchiyama, Kohei Ichikawa |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Physics
010504 meteorology & atmospheric sciences Young stellar object Extinction (astronomy) Mid infrared Spectral density FOS: Physical sciences Astronomy and Astrophysics Astrophysics Lambda Light curve 01 natural sciences Astrophysics - Astrophysics of Galaxies Accretion rate Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Magnitude (astronomy) 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) 0105 earth and related environmental sciences |
| DOI: | 10.48550/arxiv.1907.13244 |
| Popis: | We systematically investigate the mid-infrared (MIR; $\lambda>3 ~\mu$m) time variability of uniformly selected $\sim800$ 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. Comment: 12 pages, 5 figures, 3 tables. Accepted by ApJ |
| Databáze: | OpenAIRE |
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