2018AJ....155..238S


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET11:11:55

2018AJ....155..238S - Astron. J., 155, 238-238 (2018/June-0)

Spitzer light curves of the young, planetary-mass TW Hya members 2MASS J11193254-1137466AB and WISEA J114724.10-204021.3.

SCHNEIDER A.C., HARDEGREE-ULLMAN K.K., CUSHING M.C., KIRKPATRICK J.D. and SHKOLNIK E.L.

Abstract (from CDS):

We present Spitzer Space Telescope time-series photometry at 3.6 and 4.5 µm of 2MASS J11193254-1137466AB and WISEA J114724.10-204021.3, two planetary-mass, late-type (∼L7) brown dwarf members of the ∼10 Myr old TW Hya Association. These observations were taken in order to investigate whether or not a tentative trend of increasing variability amplitude with decreasing surface gravity seen for L3-L5.5 dwarfs extends to later-L spectral types and to explore the angular momentum evolution of low-mass objects. We examine each light curve for variability and find a rotation period of 19.39+0.33–0.28 hr and semi-amplitudes of 0.798+0.081–0.083% at 3.6 µm and 1.108+0.093–0.094% at 4.5 µm for WISEA J114724.10-204021.3. For 2MASS J11193254-1137466AB, we find a single period of 3.02+0.04–0.03 hr with semi-amplitudes of 0.230+0.036–0.035% at 3.6 µm and 0.453 ± 0.037% at 4.5 µm, which we find is possibly due to the rotation of one component of the binary. Combining our results with 12 other late-type L dwarfs observed with Spitzer from the literature, we find no significant differences between the 3.6 µm amplitudes of low surface gravity and field gravity late-type L brown dwarfs at Spitzer wavelengths, and find tentative evidence (75% confidence) of higher amplitude variability at 4.5 µm for young, late-type Ls. We also find a median rotation period of young brown dwarfs (10-300 Myr) of ∼10 hr, more than twice the value of the median rotation period of field-age brown dwarfs (∼4 hr), a clear signature of brown dwarf rotational evolution.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): brown dwarfs

Simbad objects: 30

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Number of rows : 30

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 2MASS J00470038+6803543 BD* 00 47 00.38664 +68 03 54.3672           L9pec 60 0
2 2MASSI J0103320+193536 BD* 01 03 32.03712 +19 35 36.1824           L6V 66 0
3 2MASS J01075242+0041563 BD* 01 07 52.42200 +00 41 56.3964           L8 48 0
4 SIMP J013656.5+093347.3 BD* 01 36 56.62488 +09 33 47.3256           T2.0 98 0
5 * 51 Eri b Pl 04 37 36.1323118067 -02 28 24.778826936           ~ 106 0
6 * bet Pic b Pl 05 47 17.0876901 -51 03 59.441135           ~ 372 1
7 2MASSI J0825196+211552 BD* 08 25 19.6171008398 +21 15 51.565129705       21.97 19.22 L7.5V 105 0
8 WISEA J085510.74-071442.5 BD* 08 55 10.83168 -07 14 42.5256           Y2 64 0
9 LP 261-75 B BD* 09 51 05.49288 +35 58 02.1288           L6V 48 0
10 2MASS J10433508+1213149 BD* 10 43 35.08368 +12 13 14.9700           L9 21 0
11 NAME TW Hya Association As* 11 01.9 -34 42           ~ 840 0
12 TWA 42 BD* 11 19 32.54328 -11 37 46.6968           L7 27 0
13 TWA 41 BD* 11 47 24.21360 -20 40 20.4384           L7V 19 0
14 TWA 27B BD* 12 07 33.50 -39 32 54.4           L3 249 0
15 2MASS J13243553+6358281 BD* 13 24 35.53752 +63 58 28.1532           L8.0+T3.5 37 0
16 WISE J140518.39+553421.3 BD* 14 05 18.39384 +55 34 21.3996           Y0(pec?) 47 0
17 2MASS J14162408+1348263 BD* 14 16 24.0749913652 +13 48 26.176168678           L5 60 0
18 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 593 0
19 2MASS J15450901+3555271 BD* 15 45 09.01392 +35 55 27.1128           L7.5 10 0
20 NAME Upper Sco Association As* 16 12 -23.4           ~ 1086 1
21 2MASS J16154255+4953211 BD* 16 15 42.55248 +49 53 21.1704           L4gamma 34 0
22 2MASS J16322911+1904407 BD* 16 32 29.11416 +19 04 40.7136       22.42 19.98 L8V 119 0
23 WISE J173835.53+273259.0 BD* 17 38 35.53440 +27 32 59.0964           Y0 47 0
24 2MASS J20431769-1551031 BD* 20 43 17.69112 -15 51 03.1644           L9.5 11 0
25 2MASS J21140802-2251358 BD* 21 14 08.02560 -22 51 35.8380           L7.5 82 0
26 2MASSW J2148162+400359 BD* 21 48 16.2971270771 +40 03 59.335322406           L7 50 0
27 2MASS J22443167+2043433 BD* 22 44 31.67376 +20 43 43.3020           L6-L8gamma 77 0
28 HD 218396 El* 23 07 28.7156905667 +21 08 03.302133882   6.21 5.953     F0+VkA5mA5 937 0
29 NAME Carina-near Moving Group MGr ~ ~           ~ 58 0
30 NAME AB Dor Moving Group MGr ~ ~           ~ 381 0

    Equat.    Gal    SGal    Ecl

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2021.03.03-11:11:55

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