時間：9月17日(四) 13：20 ~ 15：10

題目：A Search for Planet Nine with IRAS and AKARI Data

講者：後藤友嗣 教授

服務單位：國立清華大學 物理學系

地點：本校科學三館1樓 SC157

摘要：The outer solar system is theoretically predicted to harbour an undiscovered planet, often referred to as P9. Simulations suggest that its gravitational influence could explain the unusual clustering of minor bodies in the Kuiper Belt. However, no observational evidence for P9 has been found so far, as its predicted orbit lies far beyond Neptune, where it reflects only a faint amount of Sunlight. This work aims to find P9 candidates by taking advantage of two far-infrared all-sky surveys, which are IRAS and AKARI. The epochs of these two surveys were separated by 23 years, which is large enough to detect the ~3’/year orbital motion of P9. We use a dedicated AKARI Far-Infrared point source list for our P9 search – AKARI Monthly Unconfirmed Source List, which includes sources detected repeatedly only in hours timescale, but not after months. We search for objects that moved slowly between IRAS and AKARI detections given in the catalogues. First, we estimated the expected flux and orbital motion of P9 by assuming its mass, distance, and effective temperature to ensure it can be detected by IRAS and AKARI, then applied the positional and flux selection criteria to narrow down the number of sources from the catalogues. Next, we produced all possible candidate pairs whose angular separations were limited between 42′ and 69.6′, corresponding to the heliocentric distance range of 500 – 700 AU and the mass range of 7 – 17 Earth masses. There are 13 pairs obtained after the selection criteria. After image inspection, we found one good candidate, of which the IRAS source is absent from the same coordinate in the AKARI image after 23 years and vice versa. However, AKARI and IRAS detections are not enough to determine the full orbit of this candidate. This issue leads to the need for follow-up observations, which will determine the Keplerian motion of our candidate.

國立陽明交通大學物理研究所林貴林教授研究團隊參與之「江門微中子實驗（Jiangmen Underground Neutrino Observatory, JUNO）」國際合作團隊取得重要進展！最新研究成果於2026年發表於國際頂尖學術期刊《Nature》（Volume 654, Pages 343–348）。

論文資訊 

• 期刊名稱：《Nature》
• 文獻標誌：Volume 654, Pages 343–348 (2026)
• 合作團隊：The JUNO Collaboration
• 論文連結：Measurement of reactor neutrino oscillation with the first JUNO data

關於江門微中子實驗（JUNO）

江門微中子實驗（JUNO）是一項旨在探討宇宙基本粒子——微中子（Neutrino）性質的大型國際合作計畫，致力於精密測量微中子振盪振幅與質量平方差，並解開基礎物理學中關鍵的「微中子質量順序（Neutrino Mass Hierarchy）」之謎。

本所貢獻與研究展望

陽明交大物理研究所林貴林教授研究團隊自2013年即參與此國際前沿實驗，在軟體開發及物理模擬分析等皆扮演重要角色。此次研究成果發表於《Nature》期刊，不僅是 JUNO 合作團隊的里程碑，也是對本所在微中子物理研究之長期耕耘的一大激勵。

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陽明交通大學物理研究所 115 學年度第 1 學期逕修讀博士學位申請作業及時程
NYCU Institute of Physics
Operations and Schedule of Application for Direct Admission to Doctoral Program for Fall Semester 2025

• 一、申請對象:
  1. 陽明交通大學、清華大學、政治大學之學士班應屆畢業生（含申請提前畢業學生）（大學生可以逕讀博士班，不必先念碩士。）
  2. 陽明交通大學、清華大學、政治大學之之碩士班生
  Article 1. Applicants:
  1. Undergraduate students of National Yang Ming Chiao Tung University, National Tsing Hua University and National Chengchi University who graduate in the current year (including those who apply to graduate early).
  2. Master students of National Yang Ming Chiao Tung University, National Tsing Hua University and National Chengchi University.

• 二、申請:
  1. 報名：2026/6/1~6/17
  2. 請檢具「陽明交通大學逕行修讀博士學位申請表」、含名次之大學成績單與碩士班學業成績單、自傳及研習計畫各一篇、兩封副教授以上推薦函，以及其他有利審查之資料如獎項、論文發表等送交物理所所辦。
  3. 清華大學、政治大學之碩士班生，申請表須指導教授及系所主管簽章。(學士班應屆畢業生免簽章)
  Article 2. Application:
  1. Application period: June 1 ~ June 17, 2026
  2. Please submit to Institute Office of IOP “National Yang Ming Chiao Tung University Application Form of Direct Admission to Doctoral Program”, transcript for all semesters of undergraduate and master program with ranking, one autobiography, one statement of purpose, 2 letters of recommendation by associate professors or above, and other useful supporting documents such as rewards, published papers, and so on.
  3. Application forms submitted by master students of National Tsing Hua University and National Chengchi University should have the signature of their advisors and directors of the department/institute (the signature is not necessary for undergraduate students who graduate in the current year).

• 三、逕修讀博士學位名額：1名。
  Article 3. The enrollment quota of direct admission to doctoral program: 1

• 四、申請表及相關規定
  1. 「國立陽明交通大學逕修讀博士學位作業規定」
  2. 台灣聯合大學系統學生逕修讀博士學位作業要點
  3.「國立陽明交通大學逕修讀物理研究所博士學位作業規定」、申請表、推薦書。

Article 4. Application form and related regulations:

1. ” National Yang Ming Chiao Tung University Regulations of Direct Admission to Doctoral Program “
2. ” Regulations for Direct Admission of Students of the University System of Taiwan to PhD Program ”
3. ” NYCU Institute of Physics Regulations of Direct Admission to Doctoral Program “, Application, and Letter of Recommendation for Applying.

• 五、獎學金
  1. 物理所獎學金
  「國立陽明交通大學物理研究所獎助學金施行細則」https://phys.nycu.edu.tw
  2. 陽明交通大學獎學金
  本校為鼓勵優秀學生就讀博士班，提供獎勵機制，並彙整各項博士生獎學金資訊作為參考，請參閱 https://exam.nycu.edu.tw/dr/113/

Article 5. Scholarship

1. IOP Scholarship
“National Yang Ming Chiao Tung University Institute of Physics Implementation Regulations for Scholarships and Grants for Graduate Students” https://phys.nycu.edu.tw

2. NYCU Scholarship
To encourage outstanding students to pursue doctoral studies, National Yang Ming Chiao Tung University (NYCU) offers various incentive programs and has compiled information on different doctoral student scholarships for your reference, please refer to: https://exam.nycu.edu.tw/dr/113/