Optical Spectrum of Brown Dwarf TWA-5B

This optical spectrum (600 - 900 nm wavelength range) of TWA-5 B was obtained with the FORS-2 instrument at the 8.2-m VLT/KUEYEN telescope on 23 February 2000. A 30-min exposure was made through a 0.7 arcsec wide slit, positioned on the object in east-west direction, i.e., perpendicular to the direction to the much brighter TWA-5 A, only 2 arcsec to the south, see ESO Press Photo eso0023. Thanks to this, the obtained spectrum was very "clean". Also shown is the optical spectrum of a typical M9-type star. The spectra are very similar, with broad molecular absorption bands from TiO and VO. TWA-5 B also shows strong hydrogen emission (H-alpha) and weak sodium (Na) absorption, both indicative of its comparatively young age.

Credit:

ESO

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About the Image

Id:eso0023b
Type:Observation
Release date:21 July 2000
Related releases:eso0023
Size:1017 x 690 px

About the Object

Name:TWA-5 B
Type:• Milky Way : Star : Type : Brown Dwarf
• X - Stars
• X - Illustrations

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Colours & filters

BandTelescope
Optical Very Large Telescope
FORS2

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