CAREER: Nucleosynthesis in Degenerate Stars

职业：简并恒星中的核合成

• 批准号: 2233781
• 负责人: Evan Kirby
• 金额: $ 75.85万
• 依托单位: University of Notre Dame
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-07-15 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2233781&HistoricalAwards=false
• 关键词: CAREER; Nucleosynthesis; Degenerate; Stars

Dense stars cause some of the most powerful explosions in the Universe. For example, white dwarf stars explode at the end of their lives as Supernovae, when they ignite a runaway nuclear reaction. These explosions can be seen at great distances and are important for measuring the expansion of the Universe. These hot explosions expel ionized iron, nickel and other metals into space, leaving behind dense neutron stars. Neutron stars can also explode by merger of two neutron stars. This explosion is very different, and creates very heavy elements, like gold and barium. Neutron star mergers have recently been discovered with the NSF-funded Laser Interferometer Gravitational Wave Observatory (LIGO). The investigator will estimate the rate of neutron star mergers by sensitive observations of the amounts of barium, iron and other metals in nearby galaxies. The investigator's goal is to understand which types of explosions have created the elements found on Earth and throughout the Universe.High school students will participate in this research during the summer. The investigator will encourage the inclusion of new groups of students by offering stipends. The investigator also plans to implement tiers of mentoring. Faculty will mentor postdocs, who will mentor graduate students. The graduate students will mentor undergraduate students, who will mentor high school students. This strategy has been shown to encourage younger students to pursue research careers.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

致密的恒星会引起宇宙中一些最强大的爆炸。 例如，白色矮星在其生命的尽头爆炸为超新星，当它们点燃失控的核反应时。 这些爆炸可以在很远的地方看到，对于测量宇宙的膨胀非常重要。 这些热爆炸将离子化的铁、镍和其他金属驱逐到太空中，留下致密的中子星。 中子星也可以通过两颗中子星的合并而爆炸。这种爆炸是非常不同的，并创造了非常重的元素，如金和钡。 中子星星合并最近被NSF资助的激光干涉引力波天文台（LIGO）发现。研究人员将通过对附近星系中钡、铁和其他金属含量的敏感观测来估计中子星星合并的速率。 研究人员的目标是了解哪种类型的爆炸创造了地球和整个宇宙中发现的元素。高中生将在夏季参与这项研究。调查员将通过提供津贴鼓励接纳新的学生群体。 调查员还计划实施分层辅导。 教师将指导博士后，博士后将指导研究生。 研究生将指导本科生，本科生将指导高中生。 该奖项反映了NSF的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

HALO7D. III. Chemical Abundances of Milky Way Halo Stars from Medium-resolution Spectra

• DOI: 10.3847/1538-4357/acd33d
• 发表时间: 2023-02
• 期刊: The Astrophysical Journal
• 作者: Kevin A. McKinnon;E. Cunningham;C. Rockosi;P. Guhathakurta;I. Escala;E. Kirby;A. Deason

A Glimpse of the Stellar Populations and Elemental Abundances of Gravitationally Lensed, Quiescent Galaxies at z ≳ 1 with Keck Deep Spectroscopy

• DOI: 10.3847/1538-4357/acc79b
• 发表时间: 2022-12
• 期刊: The Astrophysical Journal
• 作者: Z. Zhuang;N. Leethochawalit;E. Kirby;J. Nightingale;C. Steidel;K. Glazebrook;T. Barone;Hannah Skobe;S. Sweet;T. Nanayakkara;R. Allen;Keerthi Vasan G. C.;T. Jones;G. Kacprzak;K. Tran;C. Jacobs

Dwarfs in Void Environments (DIVE): The Stellar Kinematics of Void Dwarf Galaxies Using the Keck Cosmic Web Imager

• DOI: 10.3847/1538-4357/acd189
• 发表时间: 2023-01
• 期刊: The Astrophysical Journal
• 作者: Mithi A. C. de los Reyes;E. Kirby;Z. Zhuang;C. Steidel;Yuguang Chen;Coral Wheeler

The Hubble Space Telescope Survey of M31 Satellite Galaxies. I. RR Lyrae–based Distances and Refined 3D Geometric Structure

哈勃太空望远镜对 M31 卫星星系的巡天。

• DOI: 10.3847/1538-4357/ac91cb
• 发表时间: 2022
• 期刊: The Astrophysical Journal
• 作者: Savino, Alessandro;Weisz, Daniel R.;Skillman, Evan D.;Dolphin, Andrew;Kallivayalil, Nitya;Wetzel, Andrew;Anderson, Jay;Besla, Gurtina;Boylan-Kolchin, Michael;Bullock, James S.
• 通讯作者: Bullock, James S.

A Noninteracting Galactic Black Hole Candidate in a Binary System with a Main-sequence Star

具有主序星的双星系统中的非相互作用星系黑洞候选者

• DOI: 10.3847/1538-3881/accf21
• 发表时间: 2023
• 期刊: The Astronomical Journal
• 作者: Chakrabarti, Sukanya;Simon, Joshua D.;Craig, Peter A.;Reggiani, Henrique;Brandt, Timothy D.;Guhathakurta, Puragra;Dalba, Paul A.;Kirby, Evan N.;Chang, Philip;Hey, Daniel R.
• 通讯作者: Hey, Daniel R.