The outburst of the eruptive young star OO Serpentis between 1995 and 2006

Abstract

OO Serpentis is a deeply embedded pre-main sequence star that went into outburst in 1995 and gradually faded afterwards. Its eruption resembled the well-known FU Orionis-type or EX Lupi-type outbursts. Since very few such events have ever been documented at infrared wavelengths, our aim is to study the temporal evolution of OO Ser in the infrared. OO Ser was monitored with the Infrared Space Observatory starting 4 months after peak brightness and covering 20 months. In 2004-2006 we again observed OO Ser from the ground and complemented this dataset with archival Spitzer obsevations also from 2004. We analysed these data with special attention to source confusion and constructed light curves at 10 different wavelengths as well as spectral energy distributions. The outburst caused brightening in the whole infrared regime. According to the infrared light curves, OO Ser started a wavelength-independent fading after peak brightness. Later the flux decay became slower but stayed wavelength-independent. The fading is still ongoing, and current fading rates indicate that OO Ser will not return to quiescent state before 2011. The outburst timescale of OO Ser seems to be shorter than that of FUors, but longer than that of EXors. The outburst timescale and the moderate luminosity suggest that OO Ser is different from both FUors and EXors, and shows similarities to the recently erupted young star V1647 Ori. Based on its spectral energy distribution and bolometric temperature, OO Ser seems to be an early class I object, with an age of < 10^5 yr. The object is probably surrounded by an accretion disc and a dense envelope. Due to the shorter outburst timescales, the viscosity in the circumstellar disc of OO Ser is probably an order of magnitude higher than usual for FUors.

arXiv comment12 pages, 7 figures, accepted for publication in A&A

References in corpus (8)

• Interstellar Dust Grains
• Using FU Orionis Outbursts to Constrain Self-Regulated Protostellar Disk Models
• The young stellar population in the Serpens Cloud Core: An ISOCAM survey
• The Outburst of V1647 Ori Revealed by Spitzer
• Long-term evolution of FU Orionis objects at infrared wavelengths
• The infrared properties of the new outburst star IRAS 05436-0007 in quiescent phase
• Long-term infrared variability of the UX Ori-type star SV Cep
• Photometric Mapping with ISOPHOT using the "P32" Astronomical Observation Template

Cited by in corpus (48)

• Identifying the Low Luminosity Population of Embedded Protostars in the c2d Observations of Clouds and Cores
• Resolving the Luminosity Problem in Low-Mass Star Formation
• Evolutionary Signatures in the Formation of Low-Mass Protostars. II. Towards Reconciling Models and Observations
• A Near-IR Spectroscopic Survey of FU Orionis Objects
• Episodic accretion: the interplay of infall and disc instabilities
• HOPS 383: An Outbursting Class 0 Protostar in Orion
• A population of eruptive variable protostars in VVV
• Quantifying Variability of YSOs in the Mid-IR Over Six Years with NEOWISE
• Infrared spectroscopy of eruptive variable protostars from VVV
• Near Infrared Spectroscopic Monitoring of EXor variables: First Results
• Evolution of dust and ice features around FU Orionis objects
• On the nature of the EXor accretion events: an unfrequent manifestation of a common phenomenology ?
• EX Lupi in quiescence
• How do stars gain their mass? A JCMT/SCUBA-2 Transient Survey of Protostars in Nearby Star Forming Regions
• Chronology of Episodic Accretion in Protostars -- an ALMA survey of the CO and H${}_2$O snowlines
• Fundamental aspects of episodic accretion chemistry explored with single-point models
• The Spitzer c2d Survey of Nearby Dense Cores. IX. Discovery of a Very Low Luminosity Object Driving a Molecular Outflow in the Dense Core L673-7
• The outburst of an embedded low-mass YSO in L1641
• High Resolution Near-Infrared Spectroscopy of FUors and FUor-like stars
• Eruptive Variable Stars and Outflows in Serpens NW
• Mid-Infrared Spectral Variability Atlas of Young Stellar Objects
• Explaining the luminosity spread in young clusters: proto and pre-main sequence stellar evolution in a molecular cloud environment
• The JCMT Transient Survey: Detection of sub-mm variability in a Class I protostar EC 53 in Serpens Main
• The Relationship between Mid-Infrared and Sub-Millimetre Variability of Deeply Embedded Protostars
• Massive compact disks around FU Orionis-type young eruptive stars revealed by ALMA
• Probing Episodic Accretion in Very Low Luminosity Objects
• The Rapid Outbursting Star GM Cep: An EX-or in Tr 37?
• Herschel far-infrared photometric monitoring of protostars in the Orion Nebula Cluster
• Radiative Transfer modeling of EC 53: An Episodically Accreting Class I Young Stellar Object
• Extreme Infrared Variables from UKIDSS - I. A Concentration in Star Forming Regions
• Exploring the circumstellar environment of the young eruptive star V2492 Cyg
• Observational signatures of outbursting protostars -- II: Exploring a wide range of eruptive protostars
• The progenitor of the FUor-type young eruptive star 2MASS J06593158-0405277
• Observational signatures of outbursting protostars - I: From hydrodynamic simulations to observations
• Discovery of a mid-infrared protostellar outburst of exceptional amplitude
• Dissecting the different components of the modest accretion bursts of the very young protostar HOPS 373
• The outbursting protostar 2MASS~22352345+7517076 and its environment
• V1647 ORIONIS: Keck/Nirspec 2 MICRON Echelle Observations
• Modeling snowline locations in protostars: The impact of the structure of protostellar cloud cores
• Photometric and Spectroscopic monitoring of YSOs in nearby star forming regions. I. Eruptive YSOs
• Pre-Main Sequence variables in the VMR-D : identification of T Tauri-like accreting protostars through Spitzer-IRAC variability
• WISE photometry of EXor sources and candidates
• The extraordinary far-infrared variation of a protostar: Herschel/PACS observations of LRLL54361
• The hot corino-like chemistry of four FUor-like protostars
• Submillimeter continuum variability in Planck Galactic cold clumps
• The JCMT Transient Survey: Four Year Summary of Monitoring the Submillimeter Variability of Protostars
• Infrared observations of the flaring maser source G358.93-0.03 -- SOFIA confirms an accretion burst from a massive young stellar object
• Evidence of Accretion Burst: The Viscously Heated Inner Disk of the Embedded Protostar IRAS 16316-1540