POISSON project - II - A multi-wavelength spectroscopic and photometric survey of young protostars in L 1641

Abstract

Characterising stellar and circumstellar properties of embedded young stellar objects (YSOs) is mandatory for understanding the early stages of the stellar evolution. This task requires the combination of both spectroscopy and photometry, covering the widest possible wavelength range, to disentangle the various protostellar components and activities. As part of the POISSON project, we present a multi-wavelength spectroscopic and photometric investigation of embedded YSOs in L1641, aimed to derive the stellar parameters and evolutionary stages and to infer their accretion properties. Our database includes low-resolution optical-IR spectra from the NTT and Spitzer (0.6-40 um) and photometric data covering a spectral range from 0.4 to 1100 um, which allow us to construct the YSOs spectral energy distributions (SEDs) and to infer the main stellar parameters. The SED analysis allows us to group our 27 YSOs into nine Class I, eleven Flat, and seven Class II objects. However, on the basis of the derived stellar properties, only six Class I YSOs have an age of ~10^5 yr, while the others are older 5x10^5-10^6 yr), and, among the Flat sources, three out of eleven are more evolved objects (5x10^6-10^7 yr), indicating that geometrical effects can significantly modify the SED shapes. Inferred mass accretion rates (Macc) show a wide range of values (3.6x10^-9 to 1.2x10^-5 M_sun yr^-1), which reflects the age spread observed in our sample. Average values of mass accretion rates, extinction, and spectral indices decrease with the YSO class. The youngest YSOs have the highest Macc, whereas the oldest YSOs do not show any detectable jet activity in either images and spectra. We also observe a clear correlation among the YSO Macc, M*, and age, consistent with mass accretion evolution in viscous disc models.

61 pages, 16 figures; A&A in press

References in corpus (26)

• Protoplanetary Disks and Their Evolution
• The SCUBA Legacy Catalogue: Continuum Objects Detected by SCUBA
• UV excess measures of accretion onto young very low-mass stars and brown dwarfs
• Accretion in the Rho-Oph pre-main sequence stars
• Accretion Rates in Herbig Ae stars
• High-Resolution Spectroscopy in Tr37: Gas Accretion Evolution in Evolved Dusty Disks
• Evolution of emission line activity in intermediate mass young stars
• c2d Spitzer IRS Spectra of Disks around T Tauri Stars. III. [Ne II], [Fe I], and H_2 gas-phase lines
• Recipes for stellar jets: results of combined optical/infrared diagnostics
• The Spitzer Survey of Interstellar Clouds in the Gould Belt. III. A Multi-Wavelength View of Corona Australis
• The Structure of Molecular Clouds: I - All Sky Near Infrared Extinction Maps
• The young population of the Chamaeleon II dark cloud
• The outburst and nature of two young eruptive stars in the North America/Pelican Nebula Complex
• The Relationship between the Optical Depth of the 9.7 micron Silicate Absorption Feature and Infrared Differential Extinction in Dense Clouds
• Accretion and ejection properties of embedded protostars: the case of HH26, HH34 and HH46 IRS
• A census of molecular hydrogen outflows and their sources along the Orion A molecular ridge: characteristics and overall distribution
• PTF10nvg: An Outbursting Class I Protostar in the Pelican/North American Nebula
• Infrared Nebulae Around Young Stellar Objects
• POISSON project - I - Emission lines as accretion tracers in young stellar objects: results from observations of Chamaeleon I and II sources
• IR diagnostics of embedded jets: velocity resolved observations of the HH34 and HH1 jets
• The outburst of an embedded low-mass YSO in L1641
• X-shooter observations of the accreting brown dwarf J053825.4-024241
• Optical and infrared properties of V1647 Orionis during the 2003-2006 outburst. II. Temporal evolution of the eruptive source
• Investigating the Nature of Variable Class I and Flat Spectrum Protostars Using 2-4$\mu$m Spectroscopy
• Searching for gas emission lines in Spitzer Infrared Spectrograph (IRS) spectra of young stars in Taurus
• Stellar and Circumstellar Properties of Class I Protostars

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• X-Shooter spectroscopy of young stellar objects: IV -- Accretion in low-mass stars and sub-stellar objects in Lupus
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• Continuum Variability of Deeply Embedded Protostars as a Probe of Envelope Structure
• A population of eruptive variable protostars in VVV
• Constraints from Dust Mass and Mass Accretion Rate Measurements on Angular Momentum Transport in Protoplanetary Disks
• Outflows, infall and evolution of a sample of embedded low-mass protostars. The William Herschel Line Legacy (WILL) survey
• Infrared spectroscopy of eruptive variable protostars from VVV
• Accretion-related properties of Herbig Ae/Be stars. Comparison with T Tauris
• A near-IR spectroscopic survey of massive jets towards EGOs
• The rate and latency of star formation in dense, massive clumps in the Milky Way
• Star-forming content of the giant molecular filaments in the Milky Way
• Multiwavelength Observations of V2775 Ori, an Outbursting Protostar in L 1641: Exploring the Edge of the FU Orionis Regime
• Jets and outflows of massive protostars - From cloud collapse to jet launching and cloud dispersal
• X-shooter spectroscopy of young stars with disks. The TW Hydrae association as a probe of the final stages of disk accretion
• POISSON project - III - Investigating the evolution of the mass accretion rate
• Probing the accretion-ejection connection with VLTI/AMBER: High spectral resolution observations of the Herbig Ae star HD163296
• Dust Transport and Processing in Centrifugally Driven Protoplanetary Disk Winds
• Optical Mass Flow Diagnostics in Herbig Ae/Be Stars
• An ALMA Survey of Protoplanetary Disks in Lynds 1641
• A 1.3 mm SMA Survey of 29 Variable Young Stellar Objects
• Interpreting Near Infrared Hydrogen Line Ratios in T Tauri Stars
• Extreme infrared variables from UKIDSS - II. an end-of-survey catalogue of eruptive YSOs and unusual stars
• Survey of Orion Disks with ALMA (SODA) I: Cloud-level demographics of 873 protoplanetary disks
• Extreme Infrared Variables from UKIDSS - I. A Concentration in Star Forming Regions
• Rotational evolution of solar-type protostars during the star-disk interaction phase
• The ALMA Early Science View of FUor/EXor objects. III. The Slow and Wide Outflow of V883 Ori
• The $Spitzer$ infrared spectrograph survey of protoplanetary disks in Orion A: I. disk properties
• The VLA Nascent Disk And Multiplicity Survey of Perseus Protostars (VANDAM). III. Extended Radio Emission from Protostars in Perseus
• LBT/LUCIFER near-infrared spectroscopy of PV Cephei. An outbursting young stellar object with an asymmetric jet
• Proper motions of collimated jets from intermediate-mass protostars in the Carina Nebula
• Pre-main sequence accretion in the low metallicity Galactic star-forming region Sh 2-284
• Photometric determination of the mass accretion rates of pre-main sequence stars. VI. The case of LH 95 in the Large Magellanic Cloud
• Herschel Observations of Protoplanetary Disks in Lynds 1641
• An ALMA study of outflow parameters of protoclusters: outflow feedback to maintain the turbulence
• Constraining the nature of DG Tau A's thermal and non-thermal radio emission
• Investigating 2MASS J06593158-0405277: a FUor burst in a triple system?
• On the accretion properties of young stellar objects in the L1615/L1616 cometary cloud
• Probing the hidden atomic gas in Class I jets with SOFIA
• Proper motions of embedded protostellar jets in Serpens
• The post-disk (or primordial) spin distribution of M dwarf stars
• The accretion luminosity of Class I protostars
• Comparison between accretion-related properties of Herbig Ae/Be and T Tauri stars
• The environmental imprint on molecular layering in the dusty streamer of M512