Quasi-Periodic Formaldehyde Maser Flares in the Massive Protostellar Object IRAS18566+0408

Abstract

We report results of an extensive observational campaign of the 6 cm formaldehyde maser in the young massive stellar object IRAS18566+0408 (G37.55+0.20) conducted from 2002 to 2009. Using Arecibo, VLA, and GBT, we discovered quasi-periodic formaldehyde flares (P ~ 237 days). Based on Arecibo observations, we also discovered correlated variability between formaldehyde (H2CO) and methanol (CH3OH) masers. The H2CO and CH3OH masers are not spatially coincident, as demonstrated by different line velocities and high angular resolution MERLIN observations. The flares could be caused by variations in the infrared radiation field, possibly modulated by periodic accretion onto a young binary system.

16 pages, 3 figures, accepted for publication in the Astrophysical Journal Letters

References in corpus (7)

• Visual/infrared interferometry of Orion Trapezium stars: Preliminary dynamical orbit and aperture synthesis imaging of the Theta 1 Orionis C system
• Periodic accretion from a circumbinary disk in the young binary UZ Tau E
• Variable stars across the observational HR diagram
• A Jet-like Outflow toward the High-Mass (Proto)stellar Object IRAS 18566+0408
• A Search for H2CO 6cm Emission toward Young Stellar Objects III: VLA Observations
• A New Galactic 6cm Formaldehyde Maser
• An H2CO 6cm Maser Pinpointing a Possible Circumstellar Torus in IRAS18566+0408

Cited by in corpus (47)

• On the Class II Methanol Maser Periodic Variability due to the Rotating Spiral Shocks in the Gaps of Disks Around Young Binary Stars
• Direct diagnostics of forming massive stars: stellar pulsation and periodic variability of maser sources
• A global view on star formation: The GLOSTAR Galactic Plane Survey. I. Overview and first results for the Galactic longitude range 28° < l < 36°
• On the methanol masers in G9.62+0.20E and G188.95+0.89
• Monitoring observations of 6.7 GHz methanol masers
• Periodicity in Class II methanol masers in high mass star forming regions
• Discovery of periodic and alternating flares of the methanol and water masers in G107.298+5.639
• Periodic variability of 6.7GHz methanol masers in G22.357+0.066
• A 6.7 GHz Methanol Maser Survey II. Low Galactic Latitudes
• Discovery of four periodic methanol masers and updated light curve for a further one
• New Periodic 6.7 GHz Class II Methanol Maser Associated with G358.460-0.391
• Periodic Flare of the 6.7 GHz Methanol Maser in IRAS22198+6336
• The environment of the strongest galactic methanol maser
• The shortest periodic and flaring flux variability of a methanol maser emission at 6.7 GHz in G 014.23-00.50
• Discovery of periodic class II methanol masers associated with G339.986-0.425 region
• 6.7 GHz variability characteristics of new periodic methanol maser sources
• 6.7GHz methanol maser variability in Cepheus A
• The Emission Structure of Formaldehyde MegaMasers
• Bursting Activity in a High-Mass Star-Forming Region G33.64-0.21 Observed with the 6.7 GHz Methanol Maser
• Long-term multi-frequency maser observations of the intermediate-mass young stellar object G107.298+5.639
• New evidence for Dicke's superradiance in the 6.7 GHz methanol spectral line in the interstellar medium
• A Catalog of CH_3OH 7_0-6_1 A^+ Maser Sources in Massive Star-Forming Regions. II. Masers in NGC 6334F, G8.67-0.36, and M17
• Variability monitoring of the hydroxyl maser emission in G12.889+0.489
• Discovery of 6.035GHz Hydroxyl Maser Flares in IRAS18566+0408
• Detection of periodic flares in 6.7 GHz methanol masers G45.804-0.356 and G49.043-1.079
• Pumping of the 4.8 GHz H${}_{\text{2}}$CO masers and its implications for the periodic masers in G37.55+0.20
• JVLA overview of the bursting H${}_2$O maser source G25.65+1.05
• High Resolution Observations of the Massive Protostar in IRAS18566+0408
• Molecular line search toward the flaring 6.7-GHz methanol masers of G24.33+0.13 and G359.6-0.243: rare maser transitions detected
• Periodic variability of the mainline hydroxyl masers in G9.62+0.20E
• Orientation effect on the ligh curve shape of periodic methanol maser sources
• Detection of the longest periodic variability in 6.7 GHz methanol masers G5.900-0.430
• WISE Discovery of Mid-infrared Variability in Massive Young Stellar Objects
• High-Sensitivity Observations of Molecular Lines with the Arecibo Telescope
• Variability in extragalactic class I methanol masers: New maser components toward NGC4945 and NGC253
• Long-term Variability of H${}_2$CO Masers in Star-forming Regions
• Maser Flares Driven by Variations in Pumping and Background Radiation
• Infrared variability, maser activity, and accretion of massive young stellar objects
• Massive Protocluster of a Periodic Maser Source G188.95+0.89
• Detection of 4765 MHz OH Emission in a Pre-Planetary Nebula -- CRL 618
• On the pumping of the CS($v=0$) masers in W51 e2e
• Masers in star forming regions
• Mid-Infrared and Maser Flux Variability Correlation in Massive Young Stellar Object G036.70+00.09
• Binary systems: implications for outflows & periodicities relevant to masers
• Radiation-Driven Warping of Circumbinary Disks Around Eccentric Young Star Binaries
• Periodic 6.7 GHz $\mathrm{C}{\mathrm{H}}_3\mathrm{OH}$ maser emission in G353.273+0.641: First candidate for a pulsating high-mass protostar
• A Unified Maxwell-Bloch Framework for Multi-periodic 6.7 GHz Methanol Flaring in G9.62+0.20E