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Rotational Modulation of M/L Dwarfs due to Magnetic Spots

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dc.contributor.author Butler, Ray en
dc.date.accessioned 2011-03-10T16:56:53Z en
dc.date.available 2011-03-10T16:56:53Z en
dc.date.issued 2007 en
dc.identifier.citation C. Lane, G. Hallinan, R. T. Zavala, R. F. Butler, R. P. Boyle, S. Bourke, A. A...(2007)Rotational Modulation of M/L Dwarfs due to Magnetic Spots, en
dc.identifier.uri http://hdl.handle.net/10379/1730 en
dc.description.abstract We find periodic I-band variability in two ultracool dwarfs, TVLM 513-46546 and 2MASS J00361617+1821104, on either side of the M/L dwarf boundary. Both of these targets are short-period radio transients, with the detected I-band periods matching those found at radio wavelengths (P=1.96 hr for TVLM 513-46546, and P=3 hr for 2MASS J00361617+1821104). We attribute the detected I-band periodicities to the periods of rotation of the dwarfs, supported by radius estimates and measured $v$ sin $i$ values for the objects. Based on the detected period of rotation of TVLM 513-46546 (M9) in the I-band, along with confirmation of strong magnetic fields from recent radio observations, we argue for magnetically induced spots as the cause of this periodic variability. The I-band rotational modulation of L3.5 dwarf 2MASS J00361617+1821104 appeared to vary in amplitude with time. We conclude that the most likely cause of the I-band variability for this object is magnetic spots, possibly coupled with time-evolving features such as dust clouds. en
dc.format application/pdf en
dc.language.iso en en
dc.subject Astrophysics en
dc.title Rotational Modulation of M/L Dwarfs due to Magnetic Spots en
dc.type Article en
dc.local.publishedsource http://arxiv.org/pdf/0709.1045 en
dc.description.peer-reviewed peer-reviewed en
dc.local.authors C. Lane, G. Hallinan, R. T. Zavala, R. F. Butler, R. P. Boyle, S. Bourke, A. Antonova, J. G. Doyle, F. J. Vrba and A. Golden en
dc.local.arxivid 0709.1045 en

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