Spitzer-IRS Observations of FU Orionis Objects

Abstract

We present 5-35 $\mu$m spectra, taken with the Infrared Spectrograph (IRS) on the Spitzer Space Telescope, of five FU Orionis objects: FU Ori, V1515 Cyg, V1057 Cyg, BBW 76, and V346 Nor. All but V346 Nor reveal amorphous silicate grains in emission at 10 $\mu$m and 20 $\mu$m, and show water-vapor absorption bands at 5.8 and 6.8 $\mu$m and SiO or possibly methane absorption at 8 $\mu$m. These absorption features closely match these bands in model stellar photospheres -- signs of the gaseous photospheres of the inner regions of these objects' accretion disks. The continuum emission at 5-8 $\mu$m is also consistent with such disks, and, for FU Orionis and BBW 76, longer-wavelength emission may be fit by a model which includes moderate disk flaring. V1057 Cyg and V1515 Cyg have much more emission at longer wavelengths than the others, perhaps evidence of substantial remnant of their natal, infalling envelopes.

30 pages, 8 figures, accepted by ApJ

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Cited by in corpus (57)

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• Spitzer IRS Spectra and Envelope Models of Class I Protostars in Taurus
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• Diagnosing 0.1-10 au scale morphology of the FU\,Ori disk using ALMA and VLTI/GRAVITY
• Disentangling the Environment of the FU Orionis Candidate HBC 722 with Herschel
• V346 Normae: First post-outburst observations of an FU Orionis star
• Resolving the Sub-AU-Scale Gas and Dust Distribution in FU Orionis Sources
• Mass transport from the envelope to the disk of V346 Nor: a case study for the luminosity problem in an FUor-type young eruptive star
• The progenitor of the FUor-type young eruptive star 2MASS J06593158-0405277
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• Millimeter interferometric observations of FU Orionis-type objects in Cygnus
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• An ALMA Study of the FU-Ori Type Object V900 Mon: Implications for the Progenitor
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• The Mid-Infrared Evolution of the FU Orionis Disk
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• An APEX study of molecular outflows in FUor-type stars
• Grain growth in newly discovered young eruptive stars
• APEX Observations of the CO Envelope around the Young FUor-type Star V883 Ori
• Accretion Burst Crystallizes Silicates in a Planet-Forming Disk
• Disc light variability in the FUor star V646 Puppis as observed by TESS and from the ground
• Time-domain study of the young massive cluster Westerlund 2 with the Hubble Space Telescope. I
• Time-dependent response of protoplanetary disk temperature to an FU Ori-type luminosity outburst
• Molecular inventory of a young eruptive star's environment -- Case study of the classical FU Orionis star V1057 Cyg
• Infrared and sub-mm observations of outbursting young stars with Herschel and Spitzer
• Spectro-astrometry of V1515 Cyg
• A study of the photometric and spectroscopic variations of the prototypical FU Orionis-type star V1057 Cyg
• Simulation of a protoplanetary disk accretion activity due to a collision with a gas stream
• Episodic accretion in focus: revealing the environment of FU Orionis-type stars