Discovery of Radio Emission from the Tight M8 Binary: LP 349-25

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dc.creatorPhan-Bao, N.
dc.creatorOsten, R. A.
dc.creatorLim, J.
dc.creatorMartin, E. L.
dc.creatorHo, P. T. P.
dc.date2006-10-02
dc.date2006-11-17
dc.date.accessioned2026-07-07T10:23:43Z
dc.date.available2026-07-07T10:23:43Z
dc.descriptionWe present radio observations of 8 ultracool dwarfs with a narrow spectral type range (M8-M9.5) using the Very Large Array at 8.5 GHz. Only the tight M8 binary LP 349-25 was detected. LP 349-25 is the tenth ultracool dwarf system detected in radio and its trigonometric parallax pi = 67.6 mas, recently measured by Gatewood et al., makes it the furthest ultracool system detected by the Very Large Array to date, and the most radio-luminous outside of obvious flaring activity or variability. With a separation of only 1.8 AU, masses of the components of LP 349-25 can be measured precisely without any theoretical assumptions (Forveille et al.), allowing us to clarify their fully-convective status and hence the kind of magnetic dynamo in these components which may play an important role to explain our detection of radio emission from these objects. This also makes LP 349-25 an excellent target for further studies with better constraints on the correlations between X-ray, radio emission and stellar parameters such as mass, age, temperature, and luminosity in ultracool dwarfs.
dc.descriptionaccepted by ApJ, referee's comments included, typo in equation 1 corrected
dc.identifierhttps://arxiv.org/abs/astro-ph/0610046
dc.identifierhttp://arxiv.org/abs/astro-ph/0610046
dc.identifierAstrophys.J.658:553-556,2007
dc.identifierdoi:10.1086/511061
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/175934
dc.subjectAstrophysics
dc.titleDiscovery of Radio Emission from the Tight M8 Binary: LP 349-25
dc.typetext

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