Browsing by Author "Antonova, A."

Now showing items 1-8 of 8

    • A mini-survey of ultracool dwarfs at 4.9 ghz 

      Antonova, A.; Doyle, J. G.; Hallinan, G.; Bourke, S.; Golden, A. (EDP Sciences, 2008-06-04)
      Context. A selection of ultracool dwarfs are known to be radio active, with both gyrosynchrotron emission and the electron cyclotron maser instability being given as likely emission mechanisms. Aims. We explore whether ...

    • Confirmation of the electron cyclotron maser instability as the dominant source of radio emission from very low mass stars and brown dwarfs 

      Hallinan, G.; Antonova, A.; Doyle, J. G.; Bourke, S.; Lane, C.; Golden, A. (IOP Publishing, 2008-09-01)
      We report on radio observations of the M8.5 dwarf LSR J1835+3259 and the L3.5 dwarf 2MASS J00361617+ 1821104, which provide the strongest evidence to date that the electron cyclotron maser instability is the dominant ...

    • Looking for a pulse: a search for rotationally modulated radio emission from the hot jupiter, τ boötis b 

      Hallinan, G.; Sirothia, S. K.; Antonova, A.; Ishwara-Chandra, C. H.; Bourke, S.; Doyle, J. G.; Hartman, J.; Golden, A. (IOP Publishing, 2012-12-13)
      Hot Jupiters have been proposed as a likely population of low-frequency radio sources due to electron cyclotron maser emission of similar nature to that detected from the auroral regions of magnetized solar system planets. ...

    • Magnetospherically driven optical and radio aurorae at the end of the stellar main sequence 

      Hallinan, G.; Littlefair, S. P.; Cotter, G.; Bourke, S.; Harding, L. K.; Pineda, J. S.; Butler, R. P.; Golden, A.; Basri, G.; Doyle, J. G.; Kao, M. M.; Berdyugina, S. V.; Kuznetsov, A.; Rupen, M. P.; Antonova, A. (Springer Nature, 2015-07-30)
      Aurorae are detected from all the magnetized planets in our Solar System, including Earth(1). They are powered by magnetospheric current systems that lead to the precipitation of energetic electrons into the high-latitude ...

    • Modelling the radio pulses of an ultracool dwarf 

      Yu, S.; Hallinan, G.; Doyle, J. G.; MacKinnon, A. L.; Antonova, A.; Kuznetsov, A.; Golden, A.; Zhang, Z. H. (EDP Sciences, 2010-11-30)
      Context. Recently, unanticipated magnetic activity in ultracool dwarfs (UCDs, spectral classes later than M7) has emerged from a number of radio observations. The highly (up to 100%) circularly polarized nature and high ...

    • Phase connecting multi-epoch radio data for the ultracool dwarf tvlm 513-46546 

      Doyle, J. G.; Antonova, A.; Marsh, M. S.; Hallinan, G.; Yu, S.; Golden, A. (EDP Sciences, 2010-11-19)
      Context. Radio data obtained for the ultracool dwarf TVLM 513-46546 has indicated a rotation period of approximate to 1.96 h via regular radio pulses, but how stable is this period. This has major implications regarding ...

    • Rotational modulation of the radio emission from the m9 dwarf tvlm 513−46546: broadband coherent emission at the substellar boundary? 

      Hallinan, G.; Antonova, A.; Doyle, J. G.; Bourke, S.; Brisken, W. F.; Golden, A. (IOP Publishing, 2006-12-10)
      The Very Large Array was used to observe the ultracool rapidly rotating M9 dwarf TVLM 513-46546 simultaneously at 4.88 and 8.44 GHz. The radio emission was determined to be persistent, variable, and periodic at both ...

    • Volume-limited radio survey of ultracool dwarfs 

      Antonova, A.; Hallinan, G.; Doyle, J. G.; Yu, S.; Kuznetsov, A.; Metodieva, Y.; Golden, A.; Cruz, K. L. (EDP Sciences, 2013-01-01)
      Aims. We aim to increase the sample of ultracool dwarfs studied in the radio domain to allow a more statistically significant understanding of the physical conditions associated with these magnetically active objects. Methods. ...