Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sf2a.conf..495l&link_type=abstract
"SF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: C. Charbonnel, F. Combes
Astronomy and Astrophysics
Astrophysics
Scientific paper
Some Ultra-cool dwarfs have cloudy atmospheres and are rapid rotators. Thus patterns can appear in the cloud coverage, leading to surface heterogeneities. Photometric and spectroscopic variations have already been reported in M-type, L-type and T-type ultra-cool dwarfs. However some detections are tentative because of the very low variation amplitudes.
We present results for three ultra-cool dwarfs monitored in infrared, in low resolution, with the NTT-SOFI spectrograph, using the blue and red arms, corresponding to wavelength ranges of 0.95-1.64μm and 1.53-2.52μm respectively: DENIS-P J104814.9-395604 (M9), Kelu1 (L2) and 2MASS J15074769-1627386 (L5). We find these objects variable in both SOFI arms (Kelu1 being rather stable in the blue arm, compared to the other two objects).
Bailer-Jones Coryn A. L.
Clouds Collaboration
Goldman Bertrand
Listowski C.
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