Detection of Molecular Hydrogen Emission Associated with LkHalpha 264

Abstract

We have detected emission of molecular hydrogen from a classical T Tauri star, LkHalpha 264 in the v=1-0 S(1) line at 2.122 micron. The line velocity is coincident with the rest velocity of the star. The line profile is well reproduced by a model in which the line emanates from material in a Keplerian rotating circumstellar disk. Fluorescence by X-ray ionization and shock excitation due to accretion or a low-velocity wind are considered for the emission mechanism of molecular hydrogen.

10 pages. Accepted to PASJ

References in corpus (3)

• Detections of Ro-Vibrational H${}_2$ Emission from the Disks of T Tauri Stars
• Detection of Molecular Hydrogen Orbiting a "Naked" T Tauri Star
• Interferometric Observations of the T Tauri Stars in the MBM 12 Cloud

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• Molecular Hydrogen emission from disks in the eta Chamaeleontis cluster
• Observational diagnostics of gas in protoplanetary disks
• Searching for gas emission lines in Spitzer Infrared Spectrograph (IRS) spectra of young stars in Taurus
• A Search for Spatially Resolved Infrared Ro-Vibrational Molecular Hydrogen Emission from the Disks of Young Stars
• A Search for NIR Molecular Hydrogen Emission in the CTTS LkHa 264 and the debris disk 49 Cet
• Spatially resolved H2 emission from the disk around T Tau N