2007A&A...468..557G


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.06CEST19:29:00

2007A&A...468..557G - Astronomy and Astrophysics, volume 468, 557-562 (2007/6-3)

A U-band survey of brown dwarfs in the Taurus molecular cloud with the XMM-Newton optical/UV monitor.

GROSSO N., AUDARD M., BOUVIER J., BRIGGS K.R. and GUEDEL M.

Abstract (from CDS):

We aim to characterize the U-band variability of young brown dwarfs in the Taurus Molecular Cloud and discuss its origin. We used the XMM-Newton Extended Survey of the Taurus Molecular Cloud, where a sample of 11 young bona fide brown dwarfs (spectral type later than M6) were observed simultaneously in X-rays with XMM-Newton and in the U-band with the XMM-Newton Optical/UV Monitor (OM). We obtained upper limits to the U-band emission of 10 brown dwarfs (U≥19.6-20.6mag), whereas 2MASSJ04141188+2811535 was detected in the U-band. Remarkably, the magnitude of this brown dwarf increased regularly from U∼19.5mag at the beginning of the observation, peaked 6h later at U∼18.4mag, and then decreased to U∼18.65mag in the next 2h. The first OM U-band measurement is consistent with the quiescent level observed about one year later thanks to ground follow-up observations. This brown dwarf was not detected in X-rays by XMM-Newton during the OM observation. We discuss the possible sources of U-band variability for this young brown dwarf, namely a magnetic flare, non-steady accretion onto the substellar surface, and rotational modulation of a hot spot. We conclude that this event is related to accretion from a circumsubstellar disk, where the mass accretion rate was about a factor of 3 higher than during the quiescent level.

Abstract Copyright:

Journal keyword(s): stars: low-mass, brown dwarfs - stars: individual: 2MASSJ04141188+2811535 - X-rays: stars - ISM: individual objects: the Taurus Molecular Cloud

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 2MASS J04141188+2811535 Y*O 04 14 11.8823284464 +28 11 53.410193839 18.72         M6e 47 0
2 HD 283447 Or* 04 14 12.9232870093 +28 12 12.378540314 13.17 12.07 10.68 9.45 8.67 K3Ve 380 0
3 2MASS J04215450+2652315 TT* 04 21 54.5256903324 +26 52 31.353073628           M8.5 26 0
4 2MASS J04221332+1934392 TT* 04 22 13.3188304814 +19 34 39.263053602           M8.5 24 0
5 [BLH2002] KPNO-Tau 4 BD* 04 27 27.9997171623 +26 12 05.097974406     24.722 20.54 18.75 L0 65 0
6 [BLH2002] KPNO-Tau 5 BD* 04 29 45.6733565875 +26 30 46.559502443     19.690 19.10 15.08 M7.5Ve 47 0
7 [BLH2002] KPNO-Tau 6 BD* 04 30 07.2484355471 +26 08 20.698295788     22.292 20.56 17.90 M8.5Ve 50 0
8 [BLH2002] KPNO-Tau 7 BD* 04 30 57.2037457394 +25 56 39.560007407     22.068   17.16 M8Ve 46 0
9 2MASS J04325026+2422115 BD* 04 32 50.2665216453 +24 22 11.670257724         18.79 M7.5 30 0
10 [BLH2002] KPNO-Tau 9 BD* 04 35 51.4277984148 +22 49 11.868048124     24.918   18.76 M8.5V 38 0
11 2MASS J04361038+2259560 BD* 04 36 10.3838421343 +22 59 56.003013804     22.520   16.81 M8Ve 46 0
12 2MASS J04390396+2544264 BD* 04 39 03.9603916514 +25 44 26.337817736       18.40 15.40 M7IVe 51 0
13 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3478 0

    Equat.    Gal    SGal    Ecl

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2020.07.06-19:29:00

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