Possible progression of mass flow processes around young intermediate-mass stars based on high-resolution near-infrared spectroscopy. I. Taurus

Abstract

We used the WINERED spectrograph to perform near-infrared high-resolution spectroscopy (resolving power $R=28$,000) of 13 young intermediate-mass stars in the Taurus star-forming region. Based on the presence of near- and mid-infrared continuum emission, young intermediate-mass stars can be classified into three different evolutionary stages: Phases I, II, and III in the order of evolution. Our obtained spectra ($\lambda =0.91$--1.35\,$\mu$m) depict \HeI $\lambda$10830 and P$\beta$ lines that are sensitive to magnetospheric accretion and winds. We also investigate five sources each for P$\beta$ and \ion{He}{1} lines that were obtained from previous studies along with our targets. We observe that the P$\beta$ profile morphologies in Phases I and II corresponded to an extensive variety of emission features; however, these features are not detected in Phase III. We also observe that the He I profile morphologies are mostly broad subcontinuum absorption lines in Phase I, narrow subcontinuum absorption lines in Phase II, and centered subcontinuum absorption features in Phase III. Our results indicate that the profile morphologies exhibit a progression of the dominant mass flow processes: stellar wind and probably magnetospheric accretion in the very early stage, magnetospheric accretion and disk wind in the subsequent stage, and no activities in the final stage. These interpretations further suggest that opacity in protoplanetary disks plays an important role in mass flow processes. Results also indicate that \ion{He}{1} absorption features in Phase III sources, associated with chromospheric activities even in such young phases, are characteristics of intermediate-mass stars.

arXiv commentAccepted for publication in the Astrophysical Journal

References in corpus (54)

• Protoplanetary Disks and Their Evolution
• The Occurrence and Architecture of Exoplanetary Systems
• Circumstellar Dust Disks in Taurus-Auriga: The Submillimeter Perspective
• Resolved Images of Large Cavities in Protoplanetary Transition Disks
• Observational Constraints on the Formation and Evolution of Binary Stars
• A Survey and Analysis of Spitzer Infrared Spectrograph Spectra of T Tauri Stars in Taurus
• The XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST)
• An ALMA Survey of Protoplanetary Disks in the $\sigma$ Orionis Cluster
• IRAC Observations of Taurus Pre-Main Sequence Stars
• Unveiling the Structure of Pre-Transitional Disks
• Accretion Rates in Herbig Ae stars
• A high-resolution spectropolarimetric survey of Herbig Ae/Be stars - I. Observations and measurements
• A Spitzer view of protoplanetary disks in the gamma Velorum cluster
• Probing T Tauri Accretion and Outflow with 1 Micron Spectroscopy
• An empirical criterion to classify T Tauri stars and substellar analogs using low-resolution optical spectroscopy
• Unveiling the Inner Disk Structure of T Tauri Stars
• Accretion Rates for T Tauri Stars Using Nearly Simultaneous Ultraviolet and Optical Spectra
• Magnetospheres and Disk Accretion in Herbig Ae/Be Stars
• Eclipses by circumstellar material in the T Tauri star AA Tau. II. Evidence for non-stationary magnetospheric accretion
• Stellar Parameters and Elemental Abundances of Late-G Giants
• Investigating planet formation in circumstellar disks: CARMA observations of RY Tau and DG Tau
• A hot Jupiter orbiting a 2-Myr-old solar-mass T Tauri star
• Tracing Slow Winds from T Tauri Stars via Low Velocity Forbidden Line Emission
• The circumstellar disk of AB Aurigae: evidence for envelope accretion at late stages of star formation?
• A Far-ultraviolet Atlas of Low-resolution Hubble Space Telescope Spectra of T Tauri Stars
• Oscillator Strengths and Damping Constants for Atomic Lines in the J and H Bands
• Stellar Mass Dependent Disk Dispersal
• Modeling T Tauri Winds from He I 10830 Profiles
• Multidimensional models of hydrogen and helium emission line profiles for classical T Tauri Stars: method, tests and examples
• The evolution of stars in the Taurus-Auriga T association
• Observations of T-Tauri Stars using HST-GHRS: I. Far Ultraviolet Emission Lines
• A kinematic study of the Taurus-Auriga T association
• Spiral Arms in Disks: Planets or Gravitational Instability?
• Redshifted Absorption at He I 10830 as a Probe of the Accretion Geometry of T Tauri Stars
• Modelling the magnetic activity & filtering radial velocity curves of young Suns: the weak-line T Tauri star LkCa 4
• New Tests of Magnetospheric Accretion in T Tauri Stars
• Magnetic activity and hot Jupiters of young Suns: the weak-line T Tauri stars V819 Tau and V830 Tau
• Diagnosing Mass Flows Around Herbig Ae/Be Stars Using the He I 10830 Line
• AB Aurigae Resolved: Evidence for Spiral Structure
• X-Shooter spectroscopy of young stellar objects III. Photospheric and chromospheric properties of Class III objects
• The Coronal X-ray Spectrum of the Multiple Weak-Lined T Tauri Star System HD 98800
• Active cool stars and He I 10830 Å: the coronal connection
• Rapid Evolution of the Innermost Dust Disk of Protoplanetary Disks Surrounding Intermediate-mass Stars
• Line formation in the inner winds of classical T Tauri stars: testing the conical-shell wind solution
• Discovery of a Circumbinary Disk around Herbig Ae/Be system v892 Tau
• B- and A-Type Stars in the Taurus-Auriga Star Forming Region
• Correction of near-infrared high-resolution spectra for telluric absorption at 0.90-1.35 microns
• Time-series Paschen-beta spectroscopy of SU Aurigae
• X-ray and optical bursts and flares in YSOs: results from a 5-day XMM-Newton monitoring campaign of L1551
• Evolution of the dust/gas environment around Herbig Ae/Be stars
• Aperture Synthesis Imaging of V892 Tau and PV Cep: Disk Evolution
• M Stars in the TW Hya Association: Stellar X-rays and Disk Dissipation
• Chromospheres in Metal-Poor Stars Evidenced from the He I 10830A Line
• Measuring starspots on magnetically active stars with the VLTI

Cited by in corpus (4)

• What happened before? -- The disks around the precursors of young Herbig Ae/Be stars
• Zodiacal Exoplanets in Time. XI. The Orbit and Radiation Environment of the Young M Dwarf-Hosted Planet K2-25b
• A search for thermal gyro-synchrotron emission from hot stellar coronae
• Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): Scattered light detection of a possible disk wind in RY Tau