The Effelsberg survey of FU~Orionis and EX~Lupi objects II. -- H${}_2$O maser observations

Abstract

FU Orionis (FUor) and EX Lupi (EXor) type objects are two groups of peculiar and rare pre-main sequence low-mass stars that are undergoing powerful accretion outbursts during their early stellar evolution. Water masers are widespread in star forming regions and are powerful probes of mass accretion and ejection, but little is known about the prevalence of them toward FUors/EXors. We perform the first systematic search for the 22.2 GHz water maser line in FUors/EXors to determine its overall incidence to perform follow-up high angular resolution observations. We used the Effelsberg 100-m radio telescope to observe the 22.2 GHz H2O maser toward a sample of 51 objects. We detect 5 water masers; 3 are associated with eruptive stars, resulting in a 6% detection rate for eruptive sources. These detections include one EXor, V512 Per (also known as SVS 13 or SVS 13A), and two FUors, Z CMa and HH 354 IRS. This is the first reported detection of water maser emission towards HH 354 IRS. We detect water maser emission in our pointing towards the FUor binary RNO 1B/1C, which most likely originates from the nearby deeply embedded source IRAS 00338+6312 (~4'', from RNO 1B/1C). Emission was also detected from H${}_2$O(B) (also known as SVS 13C), a Class 0 source ~30'', from the EXor V512 Per. The peak flux density of H${}_2$O(B) in our observations, 498.7 Jy, is the highest observed to date. In addition to the two non-eruptive Class 0 sources (IRAS 00338+6312 and H${}_2$O(B) /SVS 13C), we detect maser emission towards one Class 0/I (HH 354 IRS) and two Class I (V512 Per and Z CMa) eruptive stars. We demonstrate the presence of 22.2 GHz water maser emission in FUor/EXor systems, opening the way to radio interferometric observations to study these eruptive stars on small scales. Comparing our data with historical observations suggest that multiple water maser flares have occurred in both V512 Per and H${}_2$O(B).

12 pages, 8 figures, accepted for publication in Astronomy & Astrophysics

References in corpus (29)

• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• The distance to the Orion Nebula
• Gaia Photometric Science Alerts
• The CALYPSO IRAM-PdBI survey of jets from Class 0 protostars. Are jets ubiquitous in young stars ?
• Gaia 18dvy: a new FUor in the Cygnus OB3 association
• Multi-wavelength study of the low-luminosity outbursting young star HBC 722
• A likely flyby of binary protostar Z CMa caught in action
• The ALMA Early Science View of FUor/EXor objects. II. The Very Wide Outflow Driven by HBC 494
• M17 MIR: A massive protostar with multiple accretion Outbursts
• The Physical Properties of the SVS 13 Protobinary System: Two Circumstellar Disks and a Spiraling Circumbinary Disk in the Making
• The ALMA Early Science View of FUor/EXor objects. IV. Misaligned Outflows in the Complex Star-forming Environment of V1647 Ori and McNeil's Nebula
• Deeply embedded objects and shocked molecular hydrogen: The environment of the FU Orionis stars RNO 1B/1C
• The progenitor of the FUor-type young eruptive star 2MASS J06593158-0405277
• Interferometric view of the circumstellar envelopes of northern FU Orionis-type stars
• High-resolution polarimetry of Parsamian 21: revealing the structure of an edge-on FU Ori disc
• A sensitive survey for water maser emission towards Bok globules using the Robledo 70m antenna
• Recurrent strong outbursts of an EXor-like young eruptive star Gaia20eae
• Photometric and spectroscopic study of the EXor-like eruptive young star Gaia19fct
• The 2008 outburst in the Young Stellar System Z CMa. III - Multi-epoch high-angular resolution images and spectra of the components in near-infrared
• Cold CO gas in the envelopes of FU Orionis-type young eruptive stars
• V899 Mon: a peculiar eruptive young star close to the end of its outburst
• The evolution of the H2O maser emission in the accretion burst source G358.93-0.03
• APEX Observations of the CO Envelope around the Young FUor-type Star V883 Ori
• Dipper-like variability of the Gaia alerted young star V555 Ori
• Unbiased water and methanol maser surveys of NGC 1333
• The weakening outburst of the young eruptive star V582 Aur
• Discovery of 22 GHz Water Masers in the Serpens South Region
• The Effelsberg survey of FU Orionis and EX Lupi objects I. -- Host environments of FUors/EXors traced by NH${}_3$
• The Local Environment of the FUor-like Objects AR 6A and 6B

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