Context.Spatially-resoved 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. Aims. We aim to systemically extract 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. Methods. 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. Results. Relative to the J1604 star, the resolved disk has a reflectance of ${\sim}10^{-1}$~arcsec$^{-2}$ in $R$ through $H$ bands and ${\sim}10^{-2}$~arcsec$^{-2}$ 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.
Modeling the Evolution of Protoplanetary Disks: Two Pathways from Gravitational Instability to MHD Wind-Driven Accretion
Institute for Advanced Study, Tsinghua University（清华大学高等研究院）；Center for Computational Astrophysics, Flatiron Institute（Flatiron研究所计算天体物理中心）；Department of Astronomy, Tsinghua University（清华大学天文系）
Substructure in externally irradiated protoplanetary disks, I. spirals and rings in two-dimensional radiation hydrodynamics
Ludwig-Maximilians-Universität München（路德维希-马克西米利安慕尼黑大学）；Astronomy Unit, School of Physics and Astronomy, Queen Mary University of London（伦敦大学玛丽女王学院物理与天文学系天文学单元）；Max Planck Institute for Astronomy（马克斯·普朗克天文学研究所）
Starlight-driven flared-staircase geometry in radiation hydrodynamic models of protoplanetary disks
Max-Planck-Institut für Astronomie（马克斯·普朗克天文学研究所）；Fakultät für Physik und Astronomie, Universität Heidelberg（海德堡大学物理与天文学院）；Ludwig-Maximilians-Universität München（慕尼黑路德维希-马克西米利安大学）；Exzellenzcluster ORIGINS（ORIGINS卓越集群）
A family portrait of disk inner rims around Herbig Ae/Be stars: Hunting for warps, rings, self shadowing, and misalignments in the inner astronomical units
Dust characterization of the HD 163296 disk with high-resolution multi-wavelength ALMA observations
Max-Planck Institute for Astronomy（马克斯·普朗克天文学研究所）；National Astronomical Observatory of Japan（日本国立天文台）；Graduate Institute for Advanced Studies, SOKENDAI（综合研究大学院大学）；Department of Physics, National Sun Yat-Sen University（国立中山大学物理系）；Center of Astronomy and Gravitation, National Taiwan Normal University（国立台湾师范大学天文与引力研究中心）；Anton Pannekoek Institute for Astronomy, University of Amsterdam（阿姆斯特丹大学安东·潘内科克天文学研究所）；Department of Earth Science and Astronomy, The University of Tokyo（东京大学地球科学及天文学系）；Dipartimento di Fisica, Università degli Studi di Milano（米兰大学物理系）
