Inner warm disk of ESO H 279A revealed by NA I and CO overtone emission lines
arXiv:1707.05488 · doi:10.3847/1538-4357/aa799e
Abstract
We present analysis of near-infrared, high-resolution spectroscopy towards the Flat-spectrum YSO (Young Stellar Object) ESO H 279a (1.5 solar mass) in the Serpens star forming region, at the distance of 429 pc. Using the Immersion GRating INfrared Spectrometer (IGRINS, R=45,000), we detect emission lines originating from the accretion channel flow, jet, and inner disk. Specifically, we identify hydrogen Brackett series recombination, [Fe II], [Fe III], [Fe IV], Ca I, Na I, H2, H2O and CO overtone emission lines. By modeling five bands of CO overtone emission lines, and the symmetric double-peaked line profile for Na I emission lines, we find that ESO H 279a has an actively accreting Keplerian disk. From our Keplerian disk model, we find that Na I emission lines originate between 0.04 AU and 1.00 AU, while CO overtone emission lines are from the outer part of disk, in the range between 0.22 AU and 3.00 AU. It reveals that the neutral atomic Na gas is a good tracer of the innermost region of the actively accreting disk. We derive a mass accretion rate of 2-10x10^{-7} M_solar/yr from the measured Br_gamma emission luminosity of 1.78(+-0.31)x10^{31} erg/s.
arXiv comment18 pages, 8 figures, and 1 table
References in corpus (27)
- Accretion in Brown Dwarfs: an Infrared View
- Accretion in the Rho-Oph pre-main sequence stars
- A dual-frequency sub-arcsecond study of proto-planetary disks at mm wavelengths: First evidence for radial variations of the dust properties
- Near-Infrared Photometric Variability of Stars Toward the Orion A Molecular Cloud
- Young Stellar Objects in the Gould Belt
- Measuring Accretion in Young Substellar Objects: Approaching the Planetary Mass Regime
- VLBA determination of the distance to nearby star-forming regions IV. A preliminary distance to the proto-Herbig AeBe star EC95 in the Serpens Core
- A Near-Infrared Spectroscopic Survey of Class I Protostars
- Hot H2O Emission and Evidence for Turbulence in the Disk of a Young Star
- Accretion rates and accretion tracers of Herbig Ae/Be stars
- Kinematic Diagnostics of Disks Around Young Stars: CO Overtone Emission from WL16 and 1548C27
- The Physical Natures of Class I and Flat-Spectrum Protostellar Photospheres: A Near-Infrared Spectroscopic Study
- The Luminosities of Protostars in the Spitzer c2d and Gould Belt Legacy Clouds
- Evidence for an inner molecular disk around massive Young Stellar Objects
- Probing the embedded YSOs of the R CrA region through VLT-ISAAC spectroscopy
- Detections of Ro-Vibrational H Emission from the Disks of T Tauri Stars
- Investigating the inner discs of Herbig Ae/Be stars with CO bandhead and Br Gamma emission
- CARMA Large Area Star Formation Survey: Structure and Kinematics of Dense Gas in Serpens Main
- A shallow though extensive H2 2.12 micron imaging survey of Taurus-Auriga-Perseus: I. NGC1333, L1455, L1448 and B1
- Probing discs around massive young stellar objects with CO first overtone emission
- Detection of steam in the circumstellar disk around a massive Young Stellar Object
- Quiescent H2 Emission From Pre-Main Sequence Stars in Chamaeleon I
- Near-infrared spectroscopy of EX Lupi in outburst
- High Resolution K-band Spectroscopy of MWC 480 and V1331 Cyg
- The frequency of large variations in the near-infrared fluxes of T Tauri stars
- Spatio-Kinematic Structure at the Base of the [Fe II] Jets From L1551 IRS 5
- The narrow, inner CO ring around the magnetic Herbig Ae star, HD 101412