SCExAO/CHARIS Near-Infrared Scattered-Light Imaging and Integral Field Spectropolarimetry of the AB Aurigae Protoplanetary System
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| author | Dykes, Erica Currie, Thayne Lawson, Kellen Lucas, Miles Kudo, Tomoyuki Chen, Minghan Guyon, Olivier Groff, Tyler D Lozi, Julien Chilcote, Jeffrey Brandt, Timothy D. Vievard, Sebastien Skaf, Nour Deo, Vincent Morsy, Mona El Bovie, Danielle Uyama, Taichi Grady, Carol Sitko, Michael Hashimoto, Jun Martinache, Frantz Jovanovic, Nemanja Tamura, Motohide Kasdin, N. Jeremy |
| author_facet | Dykes, Erica Currie, Thayne Lawson, Kellen Lucas, Miles Kudo, Tomoyuki Chen, Minghan Guyon, Olivier Groff, Tyler D Lozi, Julien Chilcote, Jeffrey Brandt, Timothy D. Vievard, Sebastien Skaf, Nour Deo, Vincent Morsy, Mona El Bovie, Danielle Uyama, Taichi Grady, Carol Sitko, Michael Hashimoto, Jun Martinache, Frantz Jovanovic, Nemanja Tamura, Motohide Kasdin, N. Jeremy |
| contents | We analyze near-infrared integral field spectropolarimetry of the AB Aurigae protoplanetary disk and protoplanet (AB Aur b), obtained with SCExAO/CHARIS in 22 wavelength channels covering the J, H, and K passbands ($λ_{\rm o}$ = 1.1--2.4 $μm$) over angular separations of $ρ$ $\approx$ 0.13" to 1.1" ($\sim$20--175 au). Our images resolve spiral structures in the disk in each CHARIS channel. At the longest wavelengths, the data may reveal an extension of the western spiral seen in previous polarimetric data at $ρ$ $<$ 0.3" out to larger distances clockwise from the protoplanet AB Aur b, coincident with the ALMA-detected $CO$ gas spiral. While AB Aur b is detectable in complementary total intensity data, it is a non-detection in polarized light at $λ$ $>$ 1.3 $μ$m. While the observed disk color is extremely red across $JHK$, the disk has a blue intrinsic scattering color consistent with small dust grains. The disk's polarization spectrum is redder than AB Aur b's total intensity spectrum. The polarization fraction peaks at $\sim$ 0.6 along the major disk axis. Radiative transfer modeling of the CHARIS data shows that small, porous dust grains with a porosity of $p$ = 0.6--0.8 better reproduce the scattered-light appearance of the disk than more compact spheres ($p$ = 0.3), especially the polarization fraction. This work demonstrates the utility of integral field spectropolarimetry to characterize structures in protoplanetary disks and elucidate the properties of the disks' dust. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_11939 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | SCExAO/CHARIS Near-Infrared Scattered-Light Imaging and Integral Field Spectropolarimetry of the AB Aurigae Protoplanetary System Dykes, Erica Currie, Thayne Lawson, Kellen Lucas, Miles Kudo, Tomoyuki Chen, Minghan Guyon, Olivier Groff, Tyler D Lozi, Julien Chilcote, Jeffrey Brandt, Timothy D. Vievard, Sebastien Skaf, Nour Deo, Vincent Morsy, Mona El Bovie, Danielle Uyama, Taichi Grady, Carol Sitko, Michael Hashimoto, Jun Martinache, Frantz Jovanovic, Nemanja Tamura, Motohide Kasdin, N. Jeremy Earth and Planetary Astrophysics Instrumentation and Methods for Astrophysics Solar and Stellar Astrophysics We analyze near-infrared integral field spectropolarimetry of the AB Aurigae protoplanetary disk and protoplanet (AB Aur b), obtained with SCExAO/CHARIS in 22 wavelength channels covering the J, H, and K passbands ($λ_{\rm o}$ = 1.1--2.4 $μm$) over angular separations of $ρ$ $\approx$ 0.13" to 1.1" ($\sim$20--175 au). Our images resolve spiral structures in the disk in each CHARIS channel. At the longest wavelengths, the data may reveal an extension of the western spiral seen in previous polarimetric data at $ρ$ $<$ 0.3" out to larger distances clockwise from the protoplanet AB Aur b, coincident with the ALMA-detected $CO$ gas spiral. While AB Aur b is detectable in complementary total intensity data, it is a non-detection in polarized light at $λ$ $>$ 1.3 $μ$m. While the observed disk color is extremely red across $JHK$, the disk has a blue intrinsic scattering color consistent with small dust grains. The disk's polarization spectrum is redder than AB Aur b's total intensity spectrum. The polarization fraction peaks at $\sim$ 0.6 along the major disk axis. Radiative transfer modeling of the CHARIS data shows that small, porous dust grains with a porosity of $p$ = 0.6--0.8 better reproduce the scattered-light appearance of the disk than more compact spheres ($p$ = 0.3), especially the polarization fraction. This work demonstrates the utility of integral field spectropolarimetry to characterize structures in protoplanetary disks and elucidate the properties of the disks' dust. |
| title | SCExAO/CHARIS Near-Infrared Scattered-Light Imaging and Integral Field Spectropolarimetry of the AB Aurigae Protoplanetary System |
| topic | Earth and Planetary Astrophysics Instrumentation and Methods for Astrophysics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2410.11939 |