A search for water maser emission from brown dwarfs and low-luminosity young stellar objects

Abstract

We present a survey for water maser emission toward a sample of 44 low-luminosity young objects, comprising (proto-)brown dwarfs, first hydrostatic cores (FHCs), and other young stellar objects (YSOs) with bolometric luminosities lower than 0.4 L${}_{\odot }$. Water maser emission is a good tracer of energetic processes, such as mass-loss and/or accretion, and is a useful tool to study this processes with very high angular resolution. This type of emission has been confirmed in objects with L${}_{\mathrm{bol}}\ge 1$ L${}_{\odot }$. Objects with lower luminosities also undergo mass-loss and accretion, and thus, are prospective sites of maser emission. Our sensitive single-dish observations provided a single detection when pointing toward the FHC L1448 IRS 2E. However, follow-up interferometric observations showed water maser emission associated with the nearby YSO L1448 IRS 2 { (a Class 0 protostar of L${}_{\mathrm{bol}}\simeq 3.6-5.3$ L${}_{\odot }$)}, and did not find any emission toward L1448 IRS 2E. The upper limits for water maser emission determined by our observations are one order of magnitude lower than expected from the correlation between water maser luminosities and bolometric luminosities found for YSOs. This suggests that this correlation does not hold at the lower end of the (sub)stellar mass spectrum. Possible reasons are that the slope of this correlation is steeper at L${}_{\mathrm{bol}}\le 1$ L${}_{\odot }$, or that there is an absolute luminosity threshold below which water maser emission cannot be produced. Alternatively, if the correlation still stands at low luminosity, the detection rates of masers would be significantly lower than the values obtained in higher-luminosity Class 0 protostars.

arXiv commentTo be published in The Astronomical Journal. Eleven pages, four figures

References in corpus (69)

• MAMBO Mapping of Spitzer c2d Small Clouds and Cores
• Accretion in Young Stellar/Substellar Objects
• The SCUBA Legacy Catalogue: Continuum Objects Detected by SCUBA
• X-Shooter spectroscopy of young stellar objects: IV -- Accretion in low-mass stars and sub-stellar objects in Lupus
• The XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST)
• On the Evolutionary Status of Class I Stars and Herbig-Haro Energy Sources in Taurus-Auriga
• Young Low-Mass Stars and Brown Dwarfs in IC 348
• The T Tauri Phase Down to Nearly Planetary Masses: Echelle Spectra of 82 Very Low Mass Stars and Brown Dwarfs
• Tracing the Mass during Low-Mass Star Formation. I. Submillimeter Continuum Observations
• Measuring Accretion in Young Substellar Objects: Approaching the Planetary Mass Regime
• An empirical criterion to classify T Tauri stars and substellar analogs using low-resolution optical spectroscopy
• New Low-Mass Members of the Taurus Star-Forming Region
• A "Starless" Core that Isn't: Detection of a Source in the L1014 Dense Core with the Spitzer Space Telescope
• VLBA determination of the distance to nearby star-forming regions II. Hubble 4 and HDE 283572 in Taurus
• Molecular line study of the very young protostar IRAM 04191 in Taurus: Infall, rotation, and outflow
• Which are the youngest protostars? Determining properties of confirmed and candidate Class0 sources by broad-band photometry
• The Spitzer c2d Survey of Nearby Dense Cores: II: Discovery of a Low Luminosity Object in the "Evolved Starless Core" L1521F
• A resolved outflow of matter from a Brown Dwarf
• Exploring Brown Dwarf Disks
• Tracing the Mass during Low-Mass Star Formation, IV: Observations and Modeling of the Submillimeter Continuum Emission from Class I Protostars
• First Detection of Millimeter Dust Emission from Brown Dwarf Disks
• Herschel observations of B1-bS and B1-bN: two first hydrostatic core candidates in the Perseus star-forming cloud
• The Spitzer c2d Survey of Nearby Dense Cores: I: First Direct Detection of the Embedded Source in IRAM 04191+1522
• The enigmatic core L1451-mm: a first hydrostatic core? or a hidden VeLLO?
• Four Brown Dwarfs in the Taurus Star-Forming Region
• Shells, jets, and internal working surfaces in the molecular outflow from IRAS 04166+2706
• A Sub-arcsecond Survey Toward Class 0 Protostars in Perseus: Searching for Signatures of Protostellar Disks
• Brown dwarf disks with ALMA: evidence for truncated dust disks in Ophiuchus
• A Candidate Detection of the First Hydrostatic Core
• Discovery of a Low Mass Bipolar Molecular Outflow from L1014-IRS with the Submillimeter Array
• L1448 IRS2E: A candidate first hydrostatic core
• The First Detailed Look at a Brown Dwarf Disk
• Astrometry of H${}_2$O Masers in Nearby Star-Forming Regions with VERA --- IV. L1448C
• Hubble and Spitzer Observations of an Edge-on Circumstellar Disk around a Brown Dwarf
• Discovery of a Bipolar Outflow from 2MASSW J1207334-393254, A 24 Jupiter Mass Brown Dwarf
• IC348-SMM2E: a Class 0 proto-brown dwarf candidate forming as a scaled-down version of low-mass stars
• Nonlinear Evolution of Global Hydrodynamic Shallow-Water Instability in Solar Tachocline
• Detection of a Bipolar Molecular Outflow Driven by a Candidate First Hydrostatic Core
• Variable accretion and outflow in young brown dwarfs
• SPITZER: Accretion in Low Mass Stars and Brown Dwarfs in the Lambda Orionis Cluster
• Herschel/PACS observations of young sources in Taurus: the far-infrared counterpart of optical jets
• The Spitzer c2d Survey of Nearby Dense Cores. V. Discovery of a VeLLO in the "Starless" Dense Core L328
• Structural and compositional properties of brown dwarf disks: the case of 2MASS J04442713+2512164
• Evolution of Mass Outflow in Protostars
• 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
• Water masers accompanying OH and methanol masers in star formation regions
• Dusty disks at the bottom of the IMF
• Two Extreme Young Objects in Barnard 1-b
• Long-term study of water masers associated with Young Stellar Objects. II: Analysis
• A highly collimated, extremely high velocity outflow in Taurus
• Molecular Outflows in the Substellar Domain: Millimeter Observations of Young Very Low Mass Objects in Taurus and rho Ophiuchi
• A search for pre-substellar cores and proto-brown dwarf candidates in Taurus: multiwavelength analysis in the B213-L1495 clouds
• The Detection and Characterization of cm Radio Continuum Emission from the Low-mass Protostar L1014-IRS
• High Velocity Precessing Jets from the Water Fountain IRAS 18286-0959 Revealed by VLBA Observations
• The Spitzer c2d Survey of Nearby Dense Cores XI : Infrared and Submillimeter Observations of CB130
• The complex protostellar source IRAS 04325+2402
• Confirmation of the VeLLO L1148-IRS: Star Formation at very low (Column) Density
• SCUBA Mapping of Spitzer c2d Small Clouds and Cores
• Wide field CO J = 3->2 mapping of the Serpens Cloud Core
• Probing the Earliest Stage of Protostellar Evolution -- Barnard 1-bN and Barnard 1-bS
• Distances to dense cores that contain Very Low Luminosity Objects
• Molecular Jet of IRAS 04166+2706
• A CO (J=3-2) Outflow Survey of the Elias 29 Region
• A Systematic Search for Molecular Outflows Toward Candidate Low-Luminosity Protostars and Very Low Luminosity Objects
• Submillimeter Observations of the Young Low-Mass Object IRAS 04158+2805
• The new nebula in LDN 1415 - A cry from the cradle of a low-luminosity source
• A multiwavelength view of the protostellar binary IRAS04325+2402: a case for turbulent fragmentation
• Multi-epoch VLBA H${}_2$O maser observations toward the massive YSOs AFGL 2591 VLA 2 and VLA 3
• Herbig-Haro Objects - Tracers of the Formation of Low-mass Stars and Sub-stellar Objects

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