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ALMA High-resolution Multiband Analysis for the Protoplanetary Disk around TW Hya

Tsukagoshi, Takashi and Nomura, Hideko and Muto, Takayuki and Kawabe, Ryohei and Kanagawa, Kazuhiro D. and Okuzumi, Satoshi and Ida, Shigeru and Walsh, Catherine and Millar, Tom J. and Takahashi, Sanemichi Z. and Hashimoto, Jun and Uyama, Taichi and Tamura, Motohide (2022) ALMA High-resolution Multiband Analysis for the Protoplanetary Disk around TW Hya. Astrophysical Journal, 928 (1). Art. No. 49. ISSN 0004-637X. doi:10.3847/1538-4357/ac5111. https://resolver.caltech.edu/CaltechAUTHORS:20220325-248149021

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Abstract

We present a high-resolution (2.5 au) multiband analysis of the protoplanetary disk around TW Hya using Atacama Large Millimeter/submillimeter Array (ALMA) long baseline data at Bands 3, 4, 6, and 7. We aim to reconstruct a high-sensitivity millimeter continuum image and revisit the spectral index distribution. The imaging is performed by combining new ALMA data at Bands 4 and 6 with available archive data. Two methods are employed to reconstruct the images: multifrequency synthesis (MFS) and the fiducial image-oriented method, where each band is imaged separately and the frequency dependence is fitted pixel by pixel. We find that MFS imaging with a second-order Taylor expansion can reproduce the frequency dependence of the continuum emission between Bands 3 and 7 in a manner consistent with previous studies, and that it is a reasonable method for reconstructing the spectral index map. The image-oriented method provides a spectral index map consistent with the MFS imaging, but with a two times lower resolution. Mock observations of an intensity model were conducted to validate the images from the two methods. We find that the MFS imaging provides a high-resolution spectral index distribution with an uncertainty of β), and dust temperature. The derived parameters are consistent with previous works, and the enhancement of β within the intensity gaps is also confirmed, supporting a deficit of millimeter-sized grains within the gaps.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-4357/ac5111DOIArticle
https://arxiv.org/abs/2202.00376arXivDiscussion Paper
ORCID:
AuthorORCID
Tsukagoshi, Takashi0000-0002-6034-2892
Nomura, Hideko0000-0002-7058-7682
Kawabe, Ryohei0000-0002-8049-7525
Kanagawa, Kazuhiro D.0000-0001-7235-2417
Okuzumi, Satoshi0000-0002-1886-0880
Ida, Shigeru0000-0001-9564-6186
Walsh, Catherine0000-0001-6078-786X
Millar, Tom J.0000-0001-5178-3656
Takahashi, Sanemichi Z.0000-0003-3038-364X
Hashimoto, Jun0000-0002-3053-3575
Uyama, Taichi0000-0002-6879-3030
Tamura, Motohide0000-0002-6510-0681
Additional Information:© 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2021 March 15; revised 2022 January 28; accepted 2022 January 31; published 2022 March 25. We would like to thank the referee for improving our manuscript. We are also grateful to Enrique Macias for sharing the spectral index profiles of the TW Hya disk. This paper makes use of the following ALMA data: ADS/JAO.ALMA#2013.1.00114.S, 2013.1.00387.S, 2015.A.00005.S, 2015.1.00308.S, 2015.1.00686.S, 2015.1.00845.S, 2016.1.00229.S, 2016.1.00311.S, 2016.1.00440.S, 2016.1.00464.S, 2016.1.00629.S, 2016.1.00842.S, 2016.1.01495.S, 2017.1.00520.S, and 2018.1.01218.S. ALMA is a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), together with NRC (Canada), MOST and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. A part of the data analysis was carried out on the common-use data analysis computer system at the Astronomy Data Center of NAOJ. This work was supported by JSPS KAKENHI grant Nos. 17K14244, 18H05438, and 20K04017. C.W. acknowledges financial support from the University of Leeds, the Science and Technology Facilities Council, and UK Research and Innovation (grant Nos. ST/T000287/1 and MR/T040726/1). T.J.M. thanks the STFC for support via grants ST/P000312/1 and ST/T000198/1. M.T. was supported by JSPS KAKENHI grant Nos. 18H05442, 15H02063, and 22000005. K.D.K was supported by JSPS KAKENHI grant No. 19K14779. Facility: ALMA. - Software: CASA (McMullin et al. 2007), numpy (Harris et al. 2020), scipy (Virtanen et al. 2020), astropy (Astropy Collaboration et al. 2013), matplotlib (Hunter 2007), vis_sample (Loomis et al. 2017).
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
Japan Society for the Promotion of Science (JSPS)17K14244
Japan Society for the Promotion of Science (JSPS)18H05438
Japan Society for the Promotion of Science (JSPS)20K04017
University of LeedsUNSPECIFIED
Science and Technology Facilities Council (STFC)ST/T000287/1
UK Research and InnovationMR/T040726/1
Science and Technology Facilities Council (STFC)ST/P000312/1
Science and Technology Facilities Council (STFC)ST/T000198/1
Japan Society for the Promotion of Science (JSPS)18H05442
Japan Society for the Promotion of Science (JSPS)15H02063
Japan Society for the Promotion of Science (JSPS)22000005
Japan Society for the Promotion of Science (JSPS)19K14779
Subject Keywords:Protoplanetary disks; Submillimeter astronomy; Planet formation
Issue or Number:1
Classification Code:Unified Astronomy Thesaurus concepts: Protoplanetary disks (1300); Submillimeter astronomy (1647); Planet formation (1241)
DOI:10.3847/1538-4357/ac5111
Record Number:CaltechAUTHORS:20220325-248149021
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20220325-248149021
Official Citation:Takashi Tsukagoshi et al 2022 ApJ 928 49
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:114077
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:25 Mar 2022 11:33
Last Modified:25 Mar 2022 21:55

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  • ALMA High-resolution Multiband Analysis for the Protoplanetary Disk around TW Hya. (deposited 25 Mar 2022 11:33) [Currently Displayed]

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  • Tsukagoshi, Takashi and Nomura, Hideko and Muto, Takayuki and Kawabe, Ryohei and Kanagawa, Kazuhiro D. and Okuzumi, Satoshi and Ida, Shigeru and Walsh, Catherine and Millar, Tom J. and Takahashi, Sanemichi Z. and Hashimoto, Jun and Uyama, Taichi and Tamura, Motohide ALMA High-resolution Multiband Analysis for the Protoplanetary Disk around TW Hya. (deposited 25 Mar 2022 11:33) [Currently Displayed]

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