Is T Tauri North a 'Classical' T Tauri star?

Abstract

We present high-resolution $H$- and $K$-band spectroscopic observations of the archetypal T Tauri star T Tau North. Synthetic spectral modeling is used to derive the $K$-band temperature, surface gravity, magnetic field strength, and rotational velocity for this star. The $K$-band spectroscopic temperature measured is ${\mathrm{T}}_{\mathrm{K}\text{-band}}=3976\pm 90K$, which is $\sim 1000\mathrm{K}$ cooler than the temperature measured from optical observations. Our $K$-band temperature measurement for T Tau N is confirmed using equivalent width line ratio vs. temperature relations in the $H$-band, from which a ${\mathrm{T}}_{\mathrm{H}\text{-band}}=4085\pm 155K$ is derived. This optical vs. IR temperature difference is interpreted as cool or hot spots, or both, covering a significant part of the surface of T Tau N. The gravity derived for T Tau N $\log g=3.45\pm 0.14$ is lower than the gravity of nearly every other star in a sample of 24 classical T Tauri stars in Taurus. Combining these temperature and gravity results with magnetic stellar evolutionary models, we find the age of T Tau N to be less than 1 Myr old. These results suggest that T Tau N is in an earlier evolutionary stage than most classical T Tauri stars in Taurus, arguing that it is a protostar ejected from the embedded southern binary system shortly after its formation.

arXiv comment18 pages, 9 figures, 3 tables

References in corpus (41)

• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• A Method of Correcting Near-Infrared Spectra for Telluric Absorption
• An Optical Spectroscopic Study of T Tauri Stars. I. Photospheric Properties
• The Magnetic Fields of Classical T Tauri Stars
• On the Evolutionary Status of Class I Stars and Herbig-Haro Energy Sources in Taurus-Auriga
• Magnetic Inhibition of Convection and the Fundamental Properties of Low-Mass Stars. III. A Consistent 10 Myr Age for the Upper Scorpius OB Association
• Three-dimensional Simulations of Disk Accretion to an Inclined Dipole: II. Hot Spots and Variability
• Compact Disks in a High Resolution ALMA Survey of Dust Structures in the Taurus Molecular Cloud
• VLBA determination of the distance to nearby star-forming regions I. The distance to T Tauri with 0.4% accuracy
• Hot H2O Emission and Evidence for Turbulence in the Disk of a Young Star
• Placing the spotted T Tauri star LkCa 4 on an HR diagram
• 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 Evolution of the Multiplicity of Embedded Protostars I: Sample Properties and Binary Detections
• A Multiwavelength Study of Star Formation in the L1495E Cloud in Taurus
• The Evolution of the Multiplicity of Embedded Protostars II: Binary Separation Distribution & Analysis
• A Third Star in the T Tauri System
• Near-Infrared Spectroscopy of TW Hya: A Revised Spectral Type and Comparison with Magnetospheric Accretion Models
• Rotation of Low-Mass Stars in Taurus with K2
• Hyperfine Splitting in the VALD Database of Spectral-line Parameters
• Spatially resolved mid-infrared observations of the triple system T Tauri
• The magnetic propeller accretion regime of LkCa 15
• Measuring the Magnetic Field on the Classical T Tauri Star TW Hydrae
• Orbital Motion in Pre-Main Sequence Binaries
• Orphaned Protostars
• Spots, plages, and flares on lambda Andromedae and II Pegasi
• Stellar and Circumstellar Properties of the Pre-Main Sequence Binary GV Tau from Infrared Spectroscopy
• Rotation Effects in Classical T Tauri Stars
• Measuring the magnetic field of young stars using iSHELL observations: BP Tau and V347 Aur
• Orbits in the T Tauri triple system observed with SPHERE
• Magnetic topologies of young suns: The weak-line T Tauri stars TWA 6 and TWA 8A
• Magnetically Active Stars in Taurus-Auriga: Photometric Variability and Basic Physical Parameters
• Effective Temperatures of Low-Mass Stars from High-Resolution H-band Spectroscopy
• Modification of the MOOG spectral synthesis codes to account for Zeeman broadening of spectral lines
• A Spectroscopic Technique for Measuring Stellar Properties of Pre-Main Sequence Stars
• T Tauri Stars: Physical Parameters and Evolutionary Status
• New Circumstellar Structure in the T Tauri System
• Examining the T Tauri system with SPHERE
• High-contrast Polarimetry Observation of T Tau Circumstellar Environment

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• The IGRINS YSO Survey I. Stellar parameters of pre-main sequence stars in Taurus-Auriga
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• The Anatomy of an Unusual Edge-on Protoplanetary Disk. II. Gas temperature and a warm outer region
• A triple star in disarray -- Multi-epoch observations of T Tauri with VLT-SPHERE and LBT-LUCI
• Using Gravity as an Age Indicator for Young Stars
• The Variation of Circumstellar Parameters through Early Stellar Evolution