SIMBAD references

2021ApJ...921...86F - Astrophys. J., 921, 86-86 (2021/November-1)

Detection of H2 in the TWA 7 system: a probable circumstellar origin.

FLAGG L., JOHNS-KRULL C.M., FRANCE K., HERCZEG G., NAJITA J., CARPENTER J.M. and KENYON S.J.

Abstract (from CDS):

Using HST-COS far-UV spectra, we have discovered warm molecular hydrogen in the TWA 7 system. TWA 7, a ∼9 Myr old M2.5 star, has a cold debris disk and has previously shown no signs of accretion. Molecular hydrogen is expected to be extremely rare in a debris disk. While molecular hydrogen can be produced in starspots or the lower chromospheres of cool stars such as TWA 7, fluxes from progressions that get pumped by the wings of Lyα indicate that this molecular hydrogen could be circumstellar and thus that TWA 7 is accreting at very low levels and may retain a reservoir of gas in the near circumstellar environment.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Protoplanetary disks - Debris disks - T Tauri stars - Planet formation - High resolution spectroscopy - Ultraviolet astronomy - Circumstellar gas

Simbad objects: 25

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