2019AJ....157..128Z


Query : 2019AJ....157..128Z

2019AJ....157..128Z - Astron. J., 157, 128-128 (2019/March-0)

Cloud atlas: high-contrast time-resolved observations of planetary-mass companions.

ZHOU Y., APAI D., LEW B.W.P., SCHNEIDER G., MANJAVACAS E., BEDIN L.R., COWAN N.B., MARLEY M.S., RADIGAN J., KARALIDI T., LOWRANCE P.J., MILES-PAEZ P.A., METCHEV S. and BURGASSER A.J.

Abstract (from CDS):

Directly imaged planetary-mass companions offer unique opportunities in atmospheric studies of exoplanets. They share characteristics of both brown dwarfs and transiting exoplanets, and therefore are critical for connecting atmospheric characterizations for these objects. Rotational phase mapping is a powerful technique to constrain the condensate cloud properties in ultra-cool atmospheres. Applying this technique to directly imaged planetary-mass companions will be extremely valuable for constraining cloud models in low mass and surface-gravity atmospheres and for determining the rotation rate and angular momentum of substellar companions. Here, we present Hubble Space Telescope Wide Field Camera 3 near-infrared time-resolved photometry for three planetary-mass companions, AB Pic B, 2M0122B, and 2M1207b. Using two-roll differential imaging and hybrid point-spread function modeling, we achieve sub-percent photometric precision for all three observations. We find tentative modulations (<2σ) for AB Pic B and 2M0122B, but cannot reach conclusive results on 2M1207b due to strong systematics. The relatively low significance of the modulation measurements cannot rule out the hypothesis that these planetary-mass companions have the same vertical cloud structures as brown dwarfs. Our rotation rate measurements, combined with archival period measurements of planetary-mass companions and brown dwarfs, do not support a universal mass-rotation relation. The high precision of our observations and the high occurrence rates of variable low-surface-gravity objects encourage high-contrast time-resolved observations with the James Webb Space Telescope.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): methods: observational - planetary systems - planets and satellites: atmospheres

Errata: erratum vol. 158, art. 52(2019)

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 2MASS J00470038+6803543 BD* 00 47 00.38664 +68 03 54.3672           L9pec 77 0
2 LEHPM 1481B BD* 01 22 50.86 -24 39 51.6           L4-6 34 0
3 [PS78] 191 Er* 01 22 50.9356182264 -24 39 50.690658348   15.71 14.24 13.89   M3.5V 52 0
4 HD 44627 Er* 06 19 12.9130449912 -58 03 15.527294208   10.01 9.205   8.185 K1V(e) 175 1
5 HD 44627B BD* 06 19 12.9988086984 -58 03 20.198341332           L1 131 1
6 NAME AB Dor Moving Group MGr 06 38 53.4 -42 50 04           ~ 470 0
7 NAME TW Hya Association As* 11 01.9 -34 42           ~ 937 0
8 TWA 27 LM* 12 07 33.4675524840 -39 32 54.016625184     19.95 17.99 15.88 M8IVe 335 0
9 TWA 27B BD* 12 07 33.50 -39 32 54.4           L3 279 0
10 HD 218396 El* 23 07 28.7157209544 +21 08 03.310767492   6.21 5.953     F0+VkA5mA5 1123 0
11 NAME Carina Association As* ~ ~           ~ 153 1

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