2020ApJ...893L..30B


Query : 2020ApJ...893L..30B

2020ApJ...893L..30B - Astrophys. J., 893, L30-L30 (2020/April-3)

Strong near-infrared spectral variability of the young cloudy L dwarf companion VHS J1256-1257 b.

BOWLER B.P., ZHOU Y., MORLEY C.V., KATARIA T., BRYAN M.L., BENNEKE B. and BATYGIN K.

Abstract (from CDS):

Rotationally modulated variability of brown dwarfs and giant planets provides unique information about their surface brightness inhomogeneities, atmospheric circulation, cloud evolution, vertical atmospheric structure, and rotational angular momentum. We report results from Hubble Space Telescope/Wide Field Camera 3 near-infrared time-series spectroscopic observations of three companions with masses in or near the planetary regime: VHS J125601.92-125723.9 b, GSC 6214-210 B, and ROXs 42 B b. VHS J1256-1257 b exhibits strong total intensity and spectral variability with a brightness difference of 19.3% between 1.1 and 1.7 µm over 8.5 hr and even higher variability at the 24.7% level at 1.27 µm. The light curve of VHS J1256-1257 b continues to rise at the end of the observing sequence so these values represent lower limits on the full variability amplitude at this epoch. This observed variability rivals (and may surpass) the most variable brown dwarf currently known, 2MASS J21392676+0220226. The implied rotation period of VHS J1256-1257 b is ≃21-24 hr assuming sinusoidal modulations, which is unusually long for substellar objects. No significant variability is evident in the light curves of GSC 6214-210 B (<1.2%) and ROXs 42 B b (<15.6%). With a spectral type of L7, an especially red spectrum, and a young age, VHS J1256-1257 b reinforces emerging patterns between high variability amplitude, low surface gravity, and evolutionary phase near the L/T transition.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Brown dwarfs - Exoplanet atmospheric variability

Simbad objects: 42

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Number of rows : 42
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 2MASS J00132229-1143006 BD* 00 13 22.29720 -11 43 00.6168           T3pec 10 0
2 2MASS J00470038+6803543 BD* 00 47 00.38664 +68 03 54.3672           L9pec 69 0
3 V* GU Psc B BD* 01 12 36.53808 +17 04 29.9424           T3.5 64 0
4 SIMP J013656.5+093347.3 BD* 01 36 56.5605419830 +09 33 47.311965969           T2.0 115 0
5 2MASS J01383648-0322181 BD* 01 38 36.48216 -03 22 18.1308           T3 11 0
6 2MASS J04473039-1216155 BD* 04 47 30.396 -12 16 15.54           T2: 8 0
7 2MASS J05012406-0010452 BD* 05 01 24.0852555792 -00 10 45.591750444           L4gamma 47 0
8 2MASS J07584037+3247245 BD* 07 58 40.3517739525 +32 47 23.984796389           T0.0+T3.5 39 0
9 WISEA J085510.74-071442.5 BD* 08 55 10.83168 -07 14 42.5256           Y2 79 0
10 LP 261-75 B BD* 09 51 05.49288 +35 58 02.1288           L6V 56 0
11 2MASS J10101480-0406499 BD* 10 10 14.80704 -04 06 49.9320           L6 54 0
12 NAME Luhman 16B BD* 10 49 14.0744805001 -53 19 05.800116097           T0.5 53 0
13 NAME Luhman 16 ** 10 49 18.91536 -53 19 10.0776   16.86 16.20   14.95 L7.5+T0.5 88 0
14 2MASS J10521350+4422559 BD* 10 52 13.50504 +44 22 55.9128           L6.5+T1.5 31 0
15 HD 95086b Pl 10 57 03.0216129217 -68 40 02.446874288           ~ 88 1
16 TWA 41 BD* 11 47 24.21360 -20 40 20.4384           L7V 24 0
17 TWA 27B BD* 12 07 33.50 -39 32 54.4           L3 263 0
18 2MASS J12560179-1257390 * 12 56 01.7760884136 -12 57 39.189741120           ~ 2 0
19 SIPS J1256-1257B BD* 12 56 01.83264 -12 57 27.6912           L8.0 55 0
20 SIPS J1256-1257 LM* 12 56 02.1337046541 -12 57 21.924307013     17.759   13.318 M7.0 43 0
21 ULAS J130041.74+122114.7 BD* 13 00 42.08415 +12 21 15.0536         23.28 T8.5p 120 0
22 2MASS J13243553+6358281 BD* 13 24 35.53752 +63 58 28.1532           L8.0+T3.5 45 0
23 HD 116434C BD* 13 24 36.13 -51 30 16.7           L5-7 58 1
24 WISE J140518.39+553421.3 BD* 14 05 18.39384 +55 34 21.3996           Y0(pec?) 51 0
25 2MASS J15164306+3053443 BD* 15 16 43.06536 +30 53 44.3436           L8.0+L9.5 29 0
26 NAME GSC 06214-00210B LM* 16 21 54.678 -20 43 11.33           ~ 76 0
27 2MASS J16291840+0335371 BD* 16 29 18.40896 +03 35 37.1040           T2 23 0
28 NAME ROXs 42Bb LM* 16 31 14.93 -24 32 43.7           M8-L0 49 0
29 WISE J173835.53+273259.0 BD* 17 38 35.53440 +27 32 59.0964           Y0 53 0
30 2MASS J21140802-2251358 BD* 21 14 08.02560 -22 51 35.8380           L7.5 95 0
31 HD 203030B BD* 21 18 58.97 +26 13 46.1           L7.5 67 0
32 CFBDS J213926+022023 BD* 21 39 26.76936 +02 20 22.6968           L8.5+T3.5 78 0
33 V* HN Peg B BD* 21 44 28.47168 +14 46 07.7988           T2.5 118 0
34 2MASS J22153705+2110554 BD* 22 15 37.05648 +21 10 55.4916           T0+T2? 10 0
35 2MASS J22282889-4310262 BD* 22 28 28.89432 -43 10 26.2740           T6.5 62 0
36 PM J22364+4751B BD* 22 36 24.75 +47 51 39.7           Lpec 11 0
37 2MASS J22393718+1617127 BD* 22 39 37.18608 +16 17 12.7500           T3 12 0
38 2MASS J22443167+2043433 BD* 22 44 31.67376 +20 43 43.3020           L6-L8gamma 87 0
39 HD 218396e Pl 23 07 28.7156905667 +21 08 03.302133882           ~ 175 1
40 HD 218396d Pl 23 07 28.7156905667 +21 08 03.302133882           ~ 218 1
41 HD 218396c Pl 23 07 28.7156905667 +21 08 03.302133882           ~ 236 1
42 HD 218396b Pl 23 07 28.7156905667 +21 08 03.302133882           ~ 250 1

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2022.11.30-12:10:48

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