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People > Research Fellow > Curriculum Vita
Infalling Flow toward a Keplerian Disk around the Protostar L1489 IRS
Infalling and Rotational Motions of Ambient Gas around 17 Protostars
Rotating Gas Motion around Protostars
Yen, Hsi-Wei
Assistant Research Fellow
photo of Yen, Hsi-Wei
Office: ASMAB 1323
TEL: +886-2-2366-5451
FAX: +886-2-2367-7849
Email: hwyen_replace2@_asiaa.sinica.edu.tw

Education and Positions

  • Assistant Research Fellow, ASIAA (2018~present)
  • ESO Fellow, European Southern Observatory (2016~2018)
  • Postdoc, ASIAA (2013~2016)
  • Ph.D., Astrophysics, National Taiwan University (2013)
  • B.S., Physics, National Taiwan University (2008)

Honors & Awards

  • ESO Fellowship (2016~2018)
  • Academia Sinica Regular Postdoctoral Fellowship (2014~2016)
  • Significant Research Achievements of Academia Sinica (Yen et al. 2014, ApJ, 793, 1) (2014)
  • Significant Research Achievements of Academia Sinica (Yen et al. 2013, ApJ, 772, 22) (2013)

Research Interests

My research interest is star and planet formation, and the goal is to understand the origin of our solar system and the diverse properties of exoplanetary systems. I use various radio telescopes, such as ALMA, SMA, IRAM 30m and JCMT, to observe the gas kinematics in star-forming regions and protoplanetary disks. My recent projects are to investigate the role of the magnetic field in star forming regions and to search for young planets in protoplanetary disks by analyzing the gas kinematics. We are looking for graduate or undergraduate students to join our research group.

Recent Journal Papers

Complete List of Publications

  1. Yen Hsi-Wei, Zhao Bo, Koch Patrick, Krasnopolsky Ruben, Li Zhi-Yun, Ohashi Nagayoshi, Shang Hsien, Takakuwa Shigehisa, Tang Ya-Wen, "Transition from Ordered Pinched to Warped Magnetic Field on a 100 au Scale in the Class 0 Protostar B335" , The Astrophysical Journal: 893(1) 54, 2020-04 [SCI] (Fulltext)
  2. Aso Y; Hirano N; ...; Ohashi N; ...; Takakuwa S; Yen H-W; et al., "Protostellar Evolution in Serpens Main: Possible Origin of Disk-size Diversity" , The Astrophysical Journal: 887(2), 209, 2019-12 [SCI] (Fulltext)
  3. Hsieh Pei-Ying, Koch Patrick M., Kim Woong-Tae, Ho Paul T. P., Yen Hsi-Wei, Harada Nanase, Tang Ya-Wen, "The Nuclear Filaments inside the Circumnuclear Disk in the Central 0.5 pc of the Galactic Center" , The Astrophysical Journal: 885(1) L20, 2019-11 [SCI] (Fulltext)
  4. Yen Hsi-Wei, Gu Pin-Gao, Hirano Naomi, Koch Patrick M., Lee Chin-Fei, Liu Hauyu Baobab, Takakuwa Shigehisa, "HL Tau Disk in HCO+ (3–2) and (1–0) with ALMA: Gas Density, Temperature, Gap, and One-arm Spiral" , The Astrophysical Journal: 880(2) 69, 2019-08 [SCI],[SSCI] (Fulltext)
  5. Comerón F., Merín B., Reipurth B., Yen H.-W., "Silicate features in the circumstellar envelopes of the Class I binary driving source of HH 250" , Astronomy & Astrophysics: 628 A97, 2019-08 [SCI] (Fulltext)
  6. Tang Ya-Wen, Koch Patrick M., Peretto Nicolas, Novak Giles, Duarte-Cabral Ana, Chapman Nicholas L., Hsieh Pei-Ying, Yen Hsi-Wei, "Gravity, Magnetic Field, and Turbulence: Relative Importance and Impact on Fragmentation in the Infrared Dark Cloud G34.43+00.24" , The Astrophysical Journal: 878(1) 10, 2019-06 [SCI] (Fulltext)
  7. Coudé Simon, Bastien Pierre, Houde Martin, ..., Yen Hsi-Wei, ..., et al., "The JCMT BISTRO Survey: The Magnetic Field of the Barnard 1 Star-forming Region" , The Astrophysical Journal: 877(2) 88, 2019-06 [SCI] (Fulltext)
  8. Wang Jia-Wei, Lai Shih-Ping, Eswaraiah Chakali, ..., Yen Hsi-Wei, ..., et al., "JCMT BISTRO Survey: Magnetic Fields within the Hub-filament Structure in IC 5146" , The Astrophysical Journal: 876(1) 42, 2019-05 [SCI] (Fulltext)
  9. Liu Junhao, Qiu Keping, Berry David, ..., Yen Hsi-Wei, ..., et al., "The JCMT BISTRO Survey: The Magnetic Field in the Starless Core ρ Ophiuchus C" , The Astrophysical Journal: 877(1) 43, 2019-05 [SCI] (Fulltext)
  10. Hsi-Wei Yen, Shigehisa Takakuwa, Pin-Gao Gu, Naomi Hirano, Chin-Fei Lee, Hauyu Baobab Liu, Sheng-Yuan Liu, Chun-Ju Wu, "Signs of outflow feedback from a nearby young stellar object on the protostellar envelope around HL Tau" , ASTRONOMY & ASTROPHYSICS: 623, A96, 2019-03 ,[SCI] (Fulltext)
  11. (Hsi-Wei Yen)*, Bo Zhao, I-Ta Hsieh, Patrick Koch, Ruben Krasnopolsky, Chin-Fei Lee, Zhi-Yun Li, Sheng-Yuan Liu, Nagayoshi Ohashi, Shigehisa Takakuwa, 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" , ASTROPHYSICAL JOURNAL: 871, 243, 2019-02 [SCI] (Fulltext)
  12. Wu Chun-Ju, Hirano Naomi, Takakuwa Shigehisa, Yen Hsi-Wei, Aso Yusuke, "Physical and Chemical Conditions of the Protostellar Envelope and the Protoplanetary Disk in HL Tau" , The Astrophysical Journal: 869(1), 59, 2018-12 [SCI] (Fulltext)
  13. Hsi-Wei Yen, Patrick M. Koch, Carlo F. Manara, Anna Miotello, Leonardo Testi, "Stellar masses and disk properties of Lupus young stellar objects traced by velocity-aligned stacked ALMA 13CO and C18O spectra" , ASTRONOMY & ASTROPHYSICS: 616, A100, 2018-08 (Fulltext)
  14. Hsi-Wei Yen, Bo Zhao, Patrick M. Koch, Ruben Krasnopolsky, Zhi-Yun Li, Nagayoshi Ohashi, and Shigehisa Takakuwa, "Constraint on ion-neutral drift velocity in the Class 0 protostar B335 from ALMA observations" , ASTRONOMY & ASTROPHYSICS: 615, A58, 2018-07 (Fulltext)
  15. Soam A; Pattle K; Ward-Thompson D; ...; Koch PM; ...; Lai SP; ...; Rao R; ...; Chen R-H; ....; Kemper F; ...; Liu SY; ...; Ohashi N; ...; Tang YW; ...; Yen HW; et al., "Magnetic Fields toward Ophiuchus-B Derived from SCUBA-2 Polarization Measurements" , The Astrophysical Journal: 861(1), 65, 2018-07 [SCI] (Fulltext)
  16. Kwon J; Doi Y; Tamura M; ...; Lai, S-P; ...; Koch PM; …; Rao R; …; Chen H-R; …; Kemper F; ...; Liu S-Y;…; Ohashi N; …; Tang Y-W; ...; Yen H-W; et al., "A First Look at BISTRO Observations of the ρ Oph-A core" , The Astrophysical Journal: 859(1), 4, 2018-05 [SCI] (Fulltext)
  17. Hsi-Wei Yen, Shigehisa Takakuwa, You-Hua Chu, Naomi Hirano, Paul T. P. Ho, Kazuhiro D. Kanagawa, Chin-Fei Lee, Hauyu Baobab Liu, Sheng-Yuan Liu, Tomoaki Matsumoto, Satoki Matsushita, Takayuki Muto, Kazuya Saigo, Ya-Wen Tang, Alfonso Trejo, and Chun-Ju Wu, "1000 au exterior arcs connected to the protoplanetary disk around HL Tauri" , ASTRONOMY & ASTROPHYSICS: 608, A134, 2017-12 (Fulltext)
  18. Hsi-Wei Yen, Patrick M. Koch, Shigehisa Takakuwa, Ruben Krasnopolsky, Nagayoshi Ohashi, and Yusuke Aso, "Signs of Early-stage Disk Growth Revealed with ALMA" , ASTROPHYSICAL JOURNAL: 834(2), 178, 2017 [SCI] (Fulltext)
  19. Hsi-Wei Yen, Patrick M. Koch, Hauyu Baobab Liu, Naomi Hirano, Chin-Fei Lee, Evaria Puspitaningrum, Shigehisa Takakuwa, "Stacking Spectra in Protoplanetary Disks: Detecting Intensity Profiles from Hidden Molecular Lines in HD 163296" , Astrophysical Journal: 832, 204, 2016-12 [SCI]
  20. Hsuan-Gu Chou, Hsi-Wei Yen, Patrick M. Koch, Stephane Guilloteau, "PROTOSTAR L1455 IRS1: ROTATING DISK CONNECTING TO FILAMENTARY NETWORK" , ASTROPHYSICAL JOURNAL: 823, 151, 2016-06 [SCI]
  21. Hsi-Wei Yen, Hauyu Baobab Liu, Pin-Gao Gu, Naomi Hirano, Chin-Fei Lee, Evaria Puspitaningrum, Shigehisa Takakuwa, "Gas Gaps in the Protoplanetary Disk around the Young Protostar HL Tau" , Astrophysical Journal Letters: 820, L25, 2016-03 [SCI] (Fulltext)
  22. Hyosun Kim, Sheng-Yuan Liu, Naomi Hirano, Ronny Zhao-Geisler, Alfonso Trejo, Hsi-Wei Yen, Ronald E. Taam, Francisca Kemper, Jongsoo Kim, Do-Young Byun, and Tie Liu, "High-resolution CO observation of the carbon star CIT 6 revealing the spiral structure and a nascent bipolar outflow" , ASTROPHYSICAL JOURNAL: 814, 61, 2015-11 [SCI] (Fulltext)
  23. Yusuke Aso, Nagayoshi Ohashi, Kazuya Saigo, Shin Koyamatsu, Yuri Aikawa, Masahiko Hayashi, Masahiro N. Machida, Masao Saito, Shigehisa Takakuwa, Kengo Tomida, Kohji Tomisaka, and Hsi-Wei Yen, "ALMA Observations of the Transition from Infall Motion to Keplerian Rotation around the Late-phase Protostar TMC-1A" , ASTROPHYSICAL JOURNAL: 812, 27, 2015-10 [SCI] (Fulltext)
  24. (Hsi-Wei Yen)*, Shigehisa Takakuwa, Patrick M. Koch, Yusuke Aso, Shin Koyamatsu, Ruben Krasnopolsky, and Nagayoshi Ohashi, "No Keplerian Disk >10 AU around the Protostar B335: Magnetic Braking or Young Age?" , ASTROPHYSICAL JOURNAL: 812, 129, 2015-10 [SCI] (Fulltext)
  25. Hsi-Wei Yen, Patrick M. Koch, Shigehisa Takakuwa, Paul T. P. Ho, Nagayoshi Ohashi, and Ya-Wen Tang, "Observations of Infalling and Rotational Motions on a 1,000-AU Scale around 17 Class 0 and 0/I Protostars: Hints of Disk Growth and Magnetic Braking?" , ASTROPHYSICAL JOURNAL: 799, 193, 2015-01 [SCI] (Fulltext)
  26. Patrick M. Koch, Ya-Wen Tang, Paul T. P. Ho, Qizhou Zhang, Josep Miquel Girart, Huei-Ru Vivien Chen, Pau Frau, Hua-bai Li, Zhi-Yun Li, Hauyu Baobab Liu, Marco Padovani, Keping Qiu, Hsi-Wei Yen, How-Huan Chen, Tao-Chung Ching, Shih-Ping Lai, Ramprasad Rao, " The Importance of the Magnetic Field from an SMA-CSO-combined Sample of Star-forming Regions" , ASTROPHYSICAL JOURNAL: 797, 99, 2014-12 [SCI]
  27. Nagayoshi Ohashi, Kazuya Saigo, Yusuke Aso, Yuri Aikawa, Shin Koyamatsu, Masahiro N. Machida, Masao Saito, Sanemichi Takahashi, Shigehisa Takakuwa, Kengo Tomida, Kohji Tomisaka, Hsi-Wei Yen, "Formation of a Keplerian disk in the infalling envelope around L1527 IRS: transformation from infalling motions to Kepler motions" , ASTROPHYSICAL JOURNAL: 796(2), 131, 2014-11 [SCI] (Fulltext)
  28. Ti-Lin Chou, Shigehisa Takakuwa, Hsi-Wei Yen, Nagayoshi Ohashi, and Paul T. P. Ho, "Transition from the Infalling Envelope to the Keplerian Disk around L1551 IRS 5" , ASTROPHYSICAL JOURNAL: 796(1), 70, 2014-11 [SCI] (Fulltext)
  29. Hsi-Wei Yen, Shigehisa Takakuwa, Nagayoshi Ohashi, Yuri Aikawa, Yusuke Aso, Shin Koyamatsu, Masahiro N. Machida, Kazuya Saigo, Masao Saito, Kengo Tomida, and Kohji Tomisaka, "ALMA Observations of Infalling Flows Toward the Keplerian Disk Around the Class I Protostar L1489 IRS" , ASTROPHYSICAL JOURNAL: Volume 793, Issue 1, 1, 2014-09 [SCI] (Fulltext)
  30. Nami Sakai, Yoko Oya, Takeshi Sakai, Yoshimasa Watanabe, Tomoya Hirota, Cecilia Ceccarelli, Claudine Kahane, Ana Lopez-Sepulcre, Bertrand Lefloch, Charlotte Vastel, Sandrine Bottinelli, Emmanuel Caux, Audrey Coutens, Yuri Aikawa, Shigehisa Takakuwa, Nagayoshi Ohashi, Hsi-Wei Yen, and Satoshi Yamamoto, "A Chemical View of Protostellar-Disk Formation in L1527" , Astrophysical Journal Letters: Volume 791, Issue 2, L38, 5, 2014-08 [SCI] (Fulltext)
  31. Nami Sakai, Takeshi Sakai, Tomoya Hirota, Yoshimasa Watanabe, Cecilia Ceccarelli, Claudine Kahane, Sandrine Bottinelli, Emmanuel Caux, Karine Demyk, Charlotte Vastel, Audrey Coutens, Vianney Taquet, Nagayoshi Ohashi, Shigehisa Takakuwa, Hsi-Wei Yen, Yuri Aikawa, and Satoshi Yamamoto, "Change in the chemical composition of infalling gas forming a disk around a protostar" , NATURE: 507(7490), 78-80, 2014-03 [SCI] (Fulltext)
  32. Hsi-Wei Yen, Shigehisa Takakuwa, Nagayoshi Ohashi, and Paul P.T. Ho, "Unveiling the Evolutionary Sequence from Infalling Envelopes to Keplerian Disks around Low-Mass Protostars" , ASTROPHYSICAL JOURNAL: 772(1), 22, 2013-07 [SCI] (Fulltext)
  33. Hsi-Wei Yen, Shigehisa Takakuwa, and Nagayoshi Ohashi, "Kinematics and Physical Conditions of the Innermost Envelope in B335" , ASTROPHYSICAL JOURNAL: 742(1), 57, 2011-11 [SCI] (Fulltext)
  34. Hsi-Wei Yen, Shigehisa Takakuwa, and Nagayoshi Ohashi, "High-Velocity Jets and Slowly Rotating Envelope in B335" , ASTROPHYSICAL JOURNAL: 710(2), 1786–1799, 2010-02 [SCI] (Fulltext)
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