Faculty Profiles - TAKAKUWA Shigehisa

Papers - TAKAKUWA Shigehisa

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Ohata Y., Kakimoto H., Seki Y., Ishihara Y., Nakano Y., Yamamoto K., Takeyari S., Fujiwara M., Kitaoka T., Takakuwa S., Kubota T., Ozono K. . Pathogenic variants of the GNAS gene introduce an abnormal amino acid sequence in the β6 strand/α5 helix of Gsα, causing pseudohypoparathyroidism type 1A and pseudopseudohypoparathyroidism in two unrelated Japanese families . Bone Reports17 101637 2022.12

Language：Japanese Publisher：Bone Reports

Pseudohypoparathyroidism 1A (PHP1A) and pseudopseudohypoparathyroidism (PPHP) are caused by loss-of-function variants of GNAS, which encodes Gsα. We present two unrelated Japanese families with PHP1A and PPHP harboring unreported pathogenic variants of GNAS (c.1141delG, p.Asp381Thrfs*23 and c.1117delC, p.Arg373Alafs*31). These variants introduce abnormal amino acids in the β6 strand/α5 helix of Gsα, which interact with G protein coupling receptor (GPCR). We conclude that these variants alter the association of Gsα with GPCR and cause PHP1A or PPHP.

DOI： 10.1016/j.bonr.2022.101637

Scopus

PubMed

Sheehan P.D., Tobin J.J., Li Z.Y., van ’t Hoff M.L.R., Jørgensen J.K., Kwon W., Looney L.W., Ohashi N., Takakuwa S., Williams J.P., Aso Y., Gavino S., Gregorio-Monsalvo I.d., Han I., Lee C.W., Plunkett A., Sharma R., Aikawa Y., Lai S.P., Lee J.E., Lin Z.Y.D., Saigo K., Tomida K., Yen H.W. . A VLA View of the Flared, Asymmetric Disk around the Class 0 Protostar L1527 IRS . Astrophysical Journal934 ( 2 ) 2022.8Reviewed International coauthorship

Language：English Publishing type：Research paper (scientific journal) Publisher：Astrophysical Journal

We present high-resolution Karl G. Jansky Very Large Array (VLA) observations of the protostar L1527 IRS at 7 mm, 1.3 cm, and 2 cm wavelengths. We detect the edge-on dust disk at all three wavelengths and find that it is asymmetric, with the southern side of the disk brighter than the northern side. We confirm this asymmetry through analytic modeling and also find that the disk is flared at 7 mm. We test the data against models including gap features in the intensity profile, and though we cannot rule such models out, they do not provide a statistically significant improvement in the quality of fit to the data. From these fits, we can, however, place constraints on allowed properties of any gaps that could be present in the true, underlying intensity profile. The physical nature of the asymmetry is difficult to associate with physical features owing to the edge-on nature of the disk, but it could be related to spiral arms or asymmetries seen in other imaging of more face-on disks.

DOI： 10.3847/1538-4357/ac7a3b

Scopus

Kotomi Taniguchi, Kei E. I. Tanaka, Yichen Zhang, Rubén Fedriani, Jonathan C. Tan, Shigehisa Takakuwa, Fumitaka Nakamura, Masao Saito, Liton Majumdar, Eric Herbst . Vibrationally Excited Lines of HC3N Associated with the Molecular Disk around the G24.78+0.08 A1 Hypercompact H ii Region . The Astrophysical Journal931 ( 2 ) 99 - 99 2022.6Reviewed International coauthorship

Language：English Publishing type：Research paper (scientific journal) Publisher：American Astronomical Society

Abstract

We have analyzed Atacama Large Millimeter/submillimeter Array Band 6 data of the hypercompact H ii region G24.78+0.08 A1 (G24 HC H ii) and report the detection of vibrationally excited lines of HC3N (v7 = 2, J = 24 − 23). The spatial distribution and kinematics of a vibrationally excited line of HC3N (v7 = 2, J = 24 − 23, l = 2e) are found to be similar to the CH3CN vibrationally excited line (v8 = 1), which indicates that the HC3N emission is tracing the disk around the G24 HC H ii region previously identified by the CH3CN lines. We derive the 13CH3CN/HC13CCN abundance ratios around G24 and compare them to the CH3CN/HC3N abundance ratios in disks around Herbig Ae and T Tauri stars. The 13CH3CN/HC13CCN ratios around G24 (∼3.0–3.5) are higher than the CH3CN/HC3N ratios in the other disks (∼0.03–0.11) by more than 1 order of magnitude. The higher CH3CN/HC3N ratios around G24 suggest that the thermal desorption of CH3CN in the hot dense gas and efficient destruction of HC3N in the region irradiated by the strong UV radiation are occurring. Our results indicate that the vibrationally excited HC3N lines can be used as a disk tracer of massive protostars at the HC H ii region stage, and the combination of these nitrile species will provide information of not only chemistry but also physical conditions of the disk structures.

DOI： 10.3847/1538-4357/ac69d1

Scopus

Other Link： https://iopscience.iop.org/article/10.3847/1538-4357/ac69d1/pdf

Chau-Ching Chiong, Fumitaka Nakamura, Atsushi Nishimura, Ross A. Burns, Chen Chien, Kazuhito Dobashi, Yasunori Fujii, Chin-Ting Ho, Yau De Huang, Yuh-Jing Hwang, Shou-Ting Jian, Ryohei Kawabe, Kimihiro Kimura, Sheng-Yuan Liu, Shih-Ping Lai, Hideo Ogawa, Nozomi Okada, Seiji Kameno, Tomomi Shimoikura, Shigehisa Takakuwa, Kotomi Taniguchi, Wei-Hao Wang, You-Ting Yeh, Yasumasa Yamasaki, Yoshinori Yonekura . Extended Q-band (eQ) receiver for Nobeyama 45-m Telescope . Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI12190 2022Reviewed International coauthorship

Kotomi Taniguchi, Liton Majumdar, Adele Plunkett, Shigehisa Takakuwa, Dariusz C. Lis, Paul F. Goldsmith, Fumitaka Nakamura, Masao Saito, Eric Herbst . Chemical Compositions in the Vicinity of Protostars in Ophiuchus . The Astrophysical Journal922 ( 2 ) 152 - 152 2021.12Reviewed International coauthorship

Language：English Publishing type：Research paper (scientific journal) Publisher：American Astronomical Society

<title>Abstract</title>
We have analyzed Atacama Large Millimeter/submillimeter Array Cycle 4 Band 6 data toward two young stellar objects (YSOs), Oph-emb5 and Oph-emb9, in the Ophiuchus star-forming region. The YSO Oph-emb5 is located in a relatively quiescent region, whereas Oph-emb9 is irradiated by a nearby bright Herbig Be star. Molecular lines from <italic>cyclic</italic>-C3H2 (<italic>c</italic>-C3H2), H2CO, CH3OH, 13CO, C18O, and DCO+ have been detected from both sources, while DCN is detected only in Oph-emb9. Around Oph-emb5, <italic>c</italic>-C3H2 is enhanced at the west side, relative to the IR source, whereas H2CO and CH3OH are abundant at the east side. In the field of Oph-emb9, moment 0 maps of the <italic>c</italic>-C3H2 lines show a peak at the eastern edge of the field of view, which is irradiated by the Herbig Be star. Moment 0 maps of CH3OH and H2CO show peaks farther from the bright star. We derive the <italic>N</italic>(<italic>c</italic>-C3H2)/<italic>N</italic>(CH3OH) column density ratios at the peak positions of <italic>c</italic>-C3H2 and CH3OH near each YSO, which are identified based on their moment 0 maps. The <italic>N</italic>(<italic>c</italic>-C3H2)/<italic>N</italic>(CH3OH) ratio at the <italic>c</italic>-C3H2 peak is significantly higher than at the CH3OH peak by a factor of ∼19 in Oph-emb9, while the difference in this column density ratio between these two positions is a factor of ∼2.6 in Oph-emb5. These differences are attributed to the efficiency of the photon-dominated region chemistry in Oph-emb9. The higher DCO+ column density and the detection of DCN in Oph-emb9 are also discussed in the context of UV irradiation flux.

DOI： 10.3847/1538-4357/ac214e

Scopus

Other Link： https://iopscience.iop.org/article/10.3847/1538-4357/ac214e/pdf

Takanori Ichikawa, Miyu Kido, Daisuke Takaishi, Yoshito Shimajiri, Yusuke Tsukamoto, Shigehisa Takakuwa . Misaligned circumstellar disks and orbital motion of the young binary xz tau . Astrophysical Journal919 ( 1 ) 2021.9Reviewed

Language：English Publishing type：Research paper (scientific journal)

We report our analyses of the multi-epoch (2015-2017) Atacama Large Millimeter/submillimeter Array (ALMA) archival data of the Class II binary system XZ Tau at Bands 3, 4, and 6. The millimeter dust-continuum images show compact, unresolved (r 15 au) circumstellar disks (CSDs) around the individual binary stars, XZ Tau A and B, with a projected separation of ∼39 au. The 12CO (2-1) emission associated with those CSDs traces the Keplerian rotations, whose rotational axes are misaligned with each other (P.A. ∼-5° for XZ Tau A and ∼130° for XZ Tau B). The similar systemic velocities of the two CSDs (VLSR ∼ 6.0 km s-1) suggest that the orbital plane of the binary stars is close to the plane of the sky. From the multi-epoch ALMA data, we have also identified the relative orbital motion of the binary. Along with the previous NIR data, we found that the elliptical orbit (e = - 0.742+0.034 0.025, = a 0. 172+0. 003 0. 002, and w = -54 .2+ 4 .7 2.0) is preferable to the circular orbit. Our results suggest that the two CSDs and the orbital plane of the XZ Tau system are all misaligned with each other, and possible mechanisms to produce such a configuration are discussed. Our analyses of the multi-epoch ALMA archival data demonstrate the feasibility of time-domain science with ALMA.

DOI： 10.3847/1538-4357/ac0dc3

Scopus

Chihomi Hara, Ryohei Kawabe, Fumitaka Nakamura, Naomi Hirano, Shigehisa Takakuwa, Yoshito Shimajiri, Takeshi Kamazaki, James Di Francesco, Masahiro N. Machida, Motohide Tamura, Kazuya Saigo, Tomoaki Matsumoto, Kengo Tomida . Misaligned Twin Molecular Outflows from the Class 0 Protostellar Binary System VLA 1623A Unveiled by ALMA . The Astrophysical Journal912 ( 1 ) 34 - 34 2021.5Reviewed International coauthorship

Kotomi Taniguchi, Liton Majumdar, Shigehisa Takakuwa, Masao Saito, Dariusz C. Lis, Paul F. Goldsmith, Eric Herbst . Carbon-chain Chemistry versus Complex-organic-molecule Chemistry in Envelopes around Three Low-mass Young Stellar Objects in the Perseus Region . The Astrophysical Journal910 ( 2 ) 141 - 141 2021.4Reviewed International coauthorship

Shigehisa Takakuwa, Kazuya Saigo, Tomoaki Matsumoto, Masao Saito, Jeremy Lim, Hsi-Wei Yen, Nagayoshi Ohashi, Paul T. P. Ho, Leslie W. Looney . Circumbinary Disks of the Protostellar Binary Systems in the L1551 Region . The Astrophysical Journal898 ( 1 ) 10 2020.7Reviewed

Hsi-Wei Yen, Bo Zhao, Patrick M. Koch, Ruben Krasnopolsky, Zhi-Yun Li, Nagayoshi Ohashi, Hsien Shang, Shigehisa Takakuwa, Ya-Wen Tang . Transition from Ordered Pinched to Warped Magnetic Field on a 100 au Scale in the Class 0 Protostar B335 . The Astrophysical Journal893 ( 54 ) 2020.4Reviewed

Jinshi Sai, Nagayoshi Ohashi, Kazuya Saigo, Tomoaki Matsumoto, Yusuke Aso, Shigehisa Takakuwa, Yuri Aikawa, Ippei Kurose, Hsi-Wei Yen, Kohji Tomisaka, Kengo Tomida, Masahiro N. Machida . Disk Structure around the Class I Protostar L1489 IRS Revealed by ALMA: A Warped-disk System . The Astrophysical Journal893 ( 51 ) 2020.4Reviewed

Tetsu Kitayama, Shutaro Ueda, Takuya Akahori, Eiichiro Komatsu, Ryohei Kawabe, Kotaro Kohno, Shigehisa Takakuwa, Motokazu Takizawa, Takahiro Tsutsumi, Kohji Yoshikawa . Deeply cooled core of the Phoenix galaxy cluster imaged by ALMA with the Sunyaev-Zel'dovich effect . Publications of the Astronomical Society of Japan72 ( 2 ) 33 - 3318 2020.4Reviewed

Language：English Publishing type：Research paper (scientific journal) Publisher：Astronomical Society of Japan

We present measurements of the thermal Sunyaev-Zel'dovich effect (SZE) toward SPT-CL J2334-4243 (the Phoenix galaxy cluster) at z = 0.597 by the Atacama Large Millimeter/submillimeter Array (ALMA) in Band 3. The SZE is imaged at 5″ resolution (corresponding to the physical scale of 23 h-1 kpc) within 200 h-1kpc from the central galaxy, with the peak signal-to-noise ratio exceeding 11. Combined with the Chandra X-ray image, the ALMA SZE data further allow for non-parametric deprojection of electron temperature, density, and entropy. Our method can minimize contamination by the central active galactic nucleus and the X-ray absorbing gas within the cluster, both of which greatly affect the X-ray spectrum.We find no significant asymmetry or disturbance in the SZE image within the current measurement errors. The detected SZE signal shows much higher central concentration than other distant galaxy clusters and agrees well with the average pressure profile of local cool-core clusters. Unlike in typical clusters at any redshift, the gas temperature drops by at least a factor of 5 toward the center.We identify ~6 × 1011M⊙cool gas with temperature ~3 keV in the inner 20 h-1kpc. Taken together, our results imply that the gas is indeed cooling efficiently and nearly isobarically down to this radius in the Phoenix cluster.

DOI： 10.1093/pasj/psaa009

Scopus

arXiv

Yusuke Aso, Naomi Hirano, Yuri Aikawa, Masahiro N. Machida, Nagayoshi Ohashi, Masao Saito, Shigehisa Takakuwa, Hsi-Wei Yen, Jonathan P. Williams . Protostellar Evolution in Serpens Main: Possible Origin of Disk-size Diversity . The Astrophysical Journal887 ( 209 ) 14pp 2019.12Reviewed

Yu-Nung Su, Sheng-Yuan Liu, Zhi-Yun Li, Chin-Fei Lee, Naomi Hirano, Shigehisa Takakuwa, I.-Ta Hsieh . The Infall Motion in the Low-mass Protostellar Binary NGC 1333 IRAS 4A1/4A2 . The Astrophysical Journal885 ( 98 ) 16pp 2019.11Reviewed

Hsi-Wei Yen, Pin-Gao Gu, Naomi Hirano, Patrick M. Koch, Chin-Fei Lee, Hauyu Baobab Liu, Shigehisa Takakuwa . HL Tau Disk in HCO+ (3-2) and (1-0) with ALMA: Gas Density, Temperature, Gap, and One-arm Spiral . The Astrophysical Journal880 ( 69 ) 18pp 2019.8Reviewed

Kazuhito Motogi, Tomoya Hirota, Masahiro N. Machida, Yoshinori Yonekura, Mareki Honma, Shigehisa Takakuwa, Satoki Matsushita . The First Bird’s-eye View of a Gravitationally Unstable Accretion Disk in High-mass Star Formation . Astrophysical Journal Letters877 ( L25 ) 8pp 2019.6Reviewed

M. Yamagishi, C. Hara, R. Kawabe, F. Nakamura, T. Kamazaki, T. Takekoshi, Y. Shimajiri, H. Nomura, S. Takakuwa, and J. Di Francesco . ALMA Observations of Layered Structures due to CO Selective Dissociation in the rho Ophiuchi A Plane-parallel PDR . The Astrophysical Journal875 ( 1 ) 62 - 62 2019.4Reviewed

Hsi-Wei Yen, Shigehisa Takakuwa, Pin-Gao Gu, Naomi Hirano, Chin-Fei Lee, Hauyu Baobab Liu, Sheng-Yuan Liu, and Chun-Ju Wu . Signs of outflow feedback from a nearby young stellar object on the protostellar envelope around HL Tauri . Astronomy and Astrophysics623 ( A96 ) 2019.3Reviewed

Hsi-Wen Yen, Bo Zhao, I.-Ta Hsieh, Patrick Koch, Ruben Krasnopolsky, Chin-Fei Lee, Zhi-Yun Li, Sheng-Yuan Liu, Nagayoshi Ohashi, Shigehisa Takakuwa, and Ya-Wen Tang . JCMT POL-2 and ALMA Polarimetric Observations of 6000-100 au Scales in the Protostar B335: Linking Magnetic Field and Gas Kinematics in Observations and MHD Simulations . The Astrophysical Journal871 ( 2 ) 243 - 243 2019.2Reviewed

Dipen Sahu, Sheng-Yuan Liu, Yu-Nung Su, Zhi-Yun Li, Chin-Fei Lee, Naomi Hirano, and Shigehisa Takakuwa . Implications of a Hot Atmosphere/Corino from ALMA Observations toward NGC 1333 IRAS 4A1 . The Astrophysical Journal872 ( 2 ) 196 - 196 2019.2Reviewed

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Papers - TAKAKUWA Shigehisa