J/A+A/684/A168 RX J1604.3-2130 images (Zhong+, 2024)
Multi-band reflectance and shadowing of the protoplanetary disk RX J1604.3-2130
in scattered light.
Zhong H., Ren B.B., Ma B., Xie C., Ma J., Wallack N.L., Mawet D., Ruane G.
<Astron. Astrophys. 684, A168 (2024)>
=2024A&A...684A.168Z 2024A&A...684A.168Z (SIMBAD/NED BibCode)
ADC_Keywords: YSOs ; Photometry, infrared
Keywords: techniques: high angular resolution -
planets and satellites: detection - protoplanetary disks -
stars: imaging
Abstract:
A spatially resolved cicrumstellar disk spectrum and composition can
provide valuable insights into the bulk composition of forming
planets, as well as the mineralogical signatures that emerge during
and after planet formation.
We systemically extracted the RX J1604.3-213010 (J1604 hereafter)
protoplanetary disk in high-contrast imaging observations, and obtain
its multi-band reflectance in visible to near-infrared wavelengths.
We obtained coronagraphic observations of J1604 from the Keck
Observatory's NIRC2 instrument, and archival data from the Very Large
Telescope's SPHERE instrument. Using archival images to remove star
light and speckles, we recovered the J1604 disk and obtained its
surface brightness using forward modeling. Together with polarization
data, we obtained the relative reflectance of the disk in R, J, H (H2
and H3), K (K1 and K2), and L' bands spanning two years.
Relative to the J1604 star, the resolved disk has a reflectance of
∼10-1arcsec-2 in R through H bands and ∼10-2arcsec-2 in K and
L' bands, showing a blue color. Together with other systems, we
summarized the multi-band reflectance for 9 systems. We also
identified varying disk geometry structure, and a shadow that vanished
between June and August in 2015. Conclusions. Motivated by broad-band
observations, the deployment of cutting-edge technologies could yield
higher-resolution reflection spectra, thereby informing the dust
composition of disks in scattered light in the future. With
multi-epoch observations, variable shadows have the potential to
deepen insights into the dynamic characteristics of inner disk
regions.
Description:
FITS files of disk images in SPHERE/IRDIS (HK-band) from the Very
Large Telescope and NIRC2 (L'-band) from Keck.
We conducted an L0-band observation of RX J1604.3-2130 using the
Keck/NIRC2 vortex coronagraph, which has a pixel size of 9.942mas on
UT 2017 May 10 (Proposal ID: C280; PI: 137 D. Mawet).
We retrieved archival H-band IR dual-band imager and spectrograph
(IRDIS) observations of RX J1604.3-2130 on 2015 August 13 under
program (ID: 295.C-5034) and K-band IRDIS observations data on 2015
June 10 under program (ID: 095.C-0673). IRDIS is a dual-band imager
(DBI) in SPHERE that can pro- duce simultaneous images at two nearby
wavelengths, such as H2: 1.593um and H3: 1.667um, or K1: 2.110um and
K2: 2.251um.
The stars are located at the mathematical centers of the arrays.
The units are in counts per second per pixel for the data.
Fig1. J1604 disk images and modeling results.
(a) Observation of J1604 after subtracting the stellar speckles.
(b) Best-fitting model.
(c) Corresponding best-fitting model convolved with the PSF and
subtracted from the stellar speckle components.
(d) Residual images after removing the best-fitting model and
the stellar speckle components.
Objects:
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RA (2000) DE Designation(s)
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16 04 21.65 -21 30 28.5 RX J1604.3-2130A = 2MASS J16042165-2130284
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 175 20 List of fits images of figure 1,
RX J1604.3-2130 disk images and modeling results
fits/* . 20 Individual fits images
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See also:
J/A+A/670/L1 : 12CO cube of RX J1604.3-2130 A (Stadler+, 2023)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 22 I3 --- Nx Number of pixels along X-axis
24- 26 I3 --- Ny Number of pixels along Y-axis
28- 30 I3 Kibyte size Size of FITS file
32- 44 A13 --- FileName Name of FITS file, in subdirectory fits
46-175 A130 --- Title Title of the FITS file
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Acknowledgements:
Huisheng Zhong, zhonghsh5(at)mail2.sysu.edu.cn
Bin Ren, bin.ren(at)oca.eu)
(End) Patricia Vannier [CDS] 28-Feb-2024