Systematic Search for Blue Hypervelocity Stars from LAMOST Survey
Hypervelocity stars (HVSs) represent a unique class of objects capable of escaping the gravitational pull of the Milky Way due to extreme acceleration events, such as close encounters with the supermassive black hole at the Galactic center (GC), supernova explosions in binary systems, or multibody d...
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2025-01-01
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| Online Access: | https://doi.org/10.3847/1538-4357/adcebe |
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| author | Yongkang Sun Yang Huang Jifeng Liu Haozhu Fu Huawei Zhang Yinbi Li Cuihua Du Jianrong Shi Xiao Kong |
| author_facet | Yongkang Sun Yang Huang Jifeng Liu Haozhu Fu Huawei Zhang Yinbi Li Cuihua Du Jianrong Shi Xiao Kong |
| author_sort | Yongkang Sun |
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| description | Hypervelocity stars (HVSs) represent a unique class of objects capable of escaping the gravitational pull of the Milky Way due to extreme acceleration events, such as close encounters with the supermassive black hole at the Galactic center (GC), supernova explosions in binary systems, or multibody dynamical interactions. Finding and studying HVSs are crucial to exploring these ejection mechanisms, characterizing central black holes, probing the GC environment, and revealing the distribution of dark matter in our Galaxy. The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) spectroscopic surveys have so far identified four B-type unbound HVSs. To expand this sample with the second-phase LAMOST survey that started in 2018, we conducted a systematic search for early-type HVSs using the LAMOST Data Release 10. We identified 125 early-type high-velocity candidates with total velocities exceeding 300 km s ^−1 . Among them, we report 10 new unbound B- and A-type HVS candidates (designated LAMOST-HVS 5 through LAMOST-HVS 14), tripling the number of unbound HVSs previously identified by LAMOST. Kinematic analyses suggest that these newly discovered HVS candidates likely originated either from the GC or via dynamical interactions. Future high-resolution follow-up observations promise to refine the stellar parameters, distances, and elemental abundances of these candidates, thereby providing deeper insights into their origins and broadening their potential applications across astrophysics. |
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| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
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| spelling | doaj-art-914bbf7a88614a4eabf40b608548b87c2025-08-20T03:26:00ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0198612210.3847/1538-4357/adcebeSystematic Search for Blue Hypervelocity Stars from LAMOST SurveyYongkang Sun0https://orcid.org/0000-0002-3935-2666Yang Huang1https://orcid.org/0000-0003-3250-2876Jifeng Liu2https://orcid.org/0000-0002-2874-2706Haozhu Fu3https://orcid.org/0009-0002-4542-8046Huawei Zhang4https://orcid.org/0000-0002-7727-1699Yinbi Li5https://orcid.org/0000-0001-7607-2666Cuihua Du6https://orcid.org/0000-0002-3954-617XJianrong Shi7https://orcid.org/0000-0002-0349-7839Xiao Kong8https://orcid.org/0000-0001-8011-8401National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of China ; huangyang@ucas.ac.cn; School of Astronomy and Space Science, University of Chinese Academy of Sciences , Beijing 100049, People’s Republic of ChinaNational Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of China ; huangyang@ucas.ac.cn; School of Astronomy and Space Science, University of Chinese Academy of Sciences , Beijing 100049, People’s Republic of ChinaNational Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of China ; huangyang@ucas.ac.cn; School of Astronomy and Space Science, University of Chinese Academy of Sciences , Beijing 100049, People’s Republic of ChinaDepartment of Astronomy, Peking University , Beijing, 100871, People’s Republic of China; Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing, 100871, People’s Republic of ChinaDepartment of Astronomy, Peking University , Beijing, 100871, People’s Republic of China; Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing, 100871, People’s Republic of ChinaNational Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of China ; huangyang@ucas.ac.cn; School of Astronomy and Space Science, University of Chinese Academy of Sciences , Beijing 100049, People’s Republic of ChinaSchool of Astronomy and Space Science, University of Chinese Academy of Sciences , Beijing 100049, People’s Republic of ChinaNational Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of China ; huangyang@ucas.ac.cn; School of Astronomy and Space Science, University of Chinese Academy of Sciences , Beijing 100049, People’s Republic of ChinaNational Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of China ; huangyang@ucas.ac.cnHypervelocity stars (HVSs) represent a unique class of objects capable of escaping the gravitational pull of the Milky Way due to extreme acceleration events, such as close encounters with the supermassive black hole at the Galactic center (GC), supernova explosions in binary systems, or multibody dynamical interactions. Finding and studying HVSs are crucial to exploring these ejection mechanisms, characterizing central black holes, probing the GC environment, and revealing the distribution of dark matter in our Galaxy. The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) spectroscopic surveys have so far identified four B-type unbound HVSs. To expand this sample with the second-phase LAMOST survey that started in 2018, we conducted a systematic search for early-type HVSs using the LAMOST Data Release 10. We identified 125 early-type high-velocity candidates with total velocities exceeding 300 km s ^−1 . Among them, we report 10 new unbound B- and A-type HVS candidates (designated LAMOST-HVS 5 through LAMOST-HVS 14), tripling the number of unbound HVSs previously identified by LAMOST. Kinematic analyses suggest that these newly discovered HVS candidates likely originated either from the GC or via dynamical interactions. Future high-resolution follow-up observations promise to refine the stellar parameters, distances, and elemental abundances of these candidates, thereby providing deeper insights into their origins and broadening their potential applications across astrophysics.https://doi.org/10.3847/1538-4357/adcebeHypervelocity starsEarly-type starsSky surveysRadial velocity |
| spellingShingle | Yongkang Sun Yang Huang Jifeng Liu Haozhu Fu Huawei Zhang Yinbi Li Cuihua Du Jianrong Shi Xiao Kong Systematic Search for Blue Hypervelocity Stars from LAMOST Survey The Astrophysical Journal Hypervelocity stars Early-type stars Sky surveys Radial velocity |
| title | Systematic Search for Blue Hypervelocity Stars from LAMOST Survey |
| title_full | Systematic Search for Blue Hypervelocity Stars from LAMOST Survey |
| title_fullStr | Systematic Search for Blue Hypervelocity Stars from LAMOST Survey |
| title_full_unstemmed | Systematic Search for Blue Hypervelocity Stars from LAMOST Survey |
| title_short | Systematic Search for Blue Hypervelocity Stars from LAMOST Survey |
| title_sort | systematic search for blue hypervelocity stars from lamost survey |
| topic | Hypervelocity stars Early-type stars Sky surveys Radial velocity |
| url | https://doi.org/10.3847/1538-4357/adcebe |
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