2017MNRAS.465.1995M


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.17CEST04:07:00

2017MNRAS.465.1995M - Mon. Not. R. Astron. Soc., 465, 1995-2009 (2017/February-3)

Modelling the environment around five ultracool dwarfs via the radio domain.

METODIEVA Y.T., KUZNETSOV A.A., ANTONOVA A.E., DOYLE J.G., RAMSAY G. and WU K.

Abstract (from CDS):

We present the results of a series of short radio observations of six ultracool dwarfs made using the upgraded Very Large Array in S (2-4GHz) and C (4-7GHz) bands. LSR J1835+3259 exhibits a 100 per cent right-hand circularly polarized burst that shows intense narrow-band features with a fast negative frequency drift of about -30 MHz s–1. They are superimposed on a fainter broad-band emission feature with a total duration of about 20 min, bandwidth of about 1 GHz, centred at about 3.5 GHz, and a slow positive frequency drift of about 1 MHz s–1. This makes it the first such event detected below 4 GHz and the first one exhibiting both positive and negative frequency drifts. Polarized radio emission is also seen in 2MASS J00361617+1821104 and NLTT 33370, while LP 349-25 and TVLM 513-46546 have unpolarized emission and BRI B0021-0214 was not detected. We can reproduce the main characteristics of the burst from LSR J1835+3259 using a model describing the magnetic field of the dwarf as a tilted dipole. We also analyse the origins of the quiescent radio emission and estimate the required parameters of the magnetic field and energetic electrons. Although our results are non-unique, we find a set of models that agree well with the observations.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: activity - brown dwarfs - stars: chromospheres - stars: low-mass - stars: low-mass

Simbad objects: 16

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Number of rows : 16

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 ICRF J002225.4+001456 BiC 00 22 25.4258623 +00 14 56.161217   21.1       ~ 105 1
2 V* DY Psc BY* 00 24 24.6343271916 -01 58 19.968960103     19.42 17.301 15.022 M9.5V 194 1
3 LP 349-25 LM* 00 27 55.98816 +22 19 32.8008   18.6   16.0   M8Ve 65 0
4 ICRF J002914.2+345632 AGN 00 29 14.24246572 +34 56 32.2471186   20.2       ~ 122 1
5 LSPM J0036+1821 BD* 00 36 16.1119130763 +18 21 10.291990145       18.451 16.053 L3.5 189 0
6 QSO B0119+247 QSO 01 22 38.81597 +25 02 31.7930     18.5 17.91   ~ 57 1
7 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2585 2
8 G 272-61B Er* 01 39 01.6334059022 -17 57 01.121866655           M6V 801 0
9 LSPM J0746+2000 BD* 07 46 42.50553 +20 00 31.9757       17.9 15.034 L0+L1.5 173 1
10 LP 497-33 ** 13 14 20.376648 +13 20 01.00608   16.8 15.83 14.9 11.94 M6.0V 63 0
11 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825107   17.51 17.25     ~ 3866 2
12 ICRF J134733.3+121724 Sy2 13 47 33.36161542 +12 17 24.2402572   19.28 18.44 15.718   ~ 540 3
13 TVLM 513-46 LM* 15 01 08.1871800643 +22 50 02.120480463   21.4 15.09 18.0   M8.5V 149 0
14 4C 23.41 Rad 15 13 40.1857032 +23 38 35.200789   20       ~ 44 1
15 2MASSI J1835379+325954 PM* 18 35 37.8803560459 +32 59 53.311357837   20.0   17.1   M8.5V 106 0
16 ICRF J192417.4+332929 QSO 19 24 17.4820637005 +33 29 29.693839197           ~ 11 0

    Equat.    Gal    SGal    Ecl

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2021.05.17-04:07:00

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