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Soumen Mondal, Samrat Ghosh, Dhrimadri Khata, Santosh Joshi & Ramkrishna Das

Understanding of variability properties in very low mass stars and brown dwarfs

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Mots-clés : astronomie, astrophysique, étoiles, photométrie, variabilité

Abstract

We report on photometric variability studies of a L3.5 brown dwarf 2MASS J00361617+1821104 (2M0036+18) in the field and of four young brown dwarfs in the star-forming region IC 348. From muti-epoch observations, we found significant periodic variability in 2M0036+18 with a period of 2.66 ± 0.55 hours on one occasion while it seemed to be non-variable on three other occasions. An evolving dust cloud might cause such a scenario. Among four young brown dwarfs of IC 348 in the spectral range M7.25 - M8, one brown dwarf 2MASS J03443921+3208138 shows significant variability. The K-band spectra (2.0-2.4 m) of nine very low mass stars (M1 - M9 V) are used to characterize the water band index (H20-K2). We found that it is strongly correlated with the surface temperature of M dwarfs.

Keywords : astronomy, astrophysics, photometry, stars, variability

To cite this article

Soumen Mondal, Samrat Ghosh, Dhrimadri Khata, Santosh Joshi & Ramkrishna Das, «Understanding of variability properties in very low mass stars and brown dwarfs», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 87 - Année 2018, Actes de colloques, First Belgo-Indian Network for Astronomy & Astrophysics (BINA) workshop - November 2016 - Nainital, India, 242 - 252 URL : https://popups.uliege.be:443/0037-9565/index.php?id=7677.

About: Soumen Mondal

S. N. Bose National Centre for Basic Sciences, JD Block, Salt Lake, Kolkata-700106, India

About: Samrat Ghosh

S. N. Bose National Centre for Basic Sciences, JD Block, Salt Lake, Kolkata-700106, India

About: Dhrimadri Khata

S. N. Bose National Centre for Basic Sciences, JD Block, Salt Lake, Kolkata-700106, India

About: Santosh Joshi

Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital, India

About: Ramkrishna Das

S. N. Bose National Centre for Basic Sciences, JD Block, Salt Lake, Kolkata-700106, India