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Geier S, Fürst F, Ziegerer E, Kupfer T, Heber U, Irrgang A, Wang B, Liu Z, Han Z, Sesar B, Levitan D, Kotak R, Magnier E, Smith K, Burgett WS, Chambers K, Flewelling H, Kaiser N, Wainscoat R, Waters C. Stellar dynamics. The fastest unbound star in our Galaxy ejected by a thermonuclear supernova. Science 2015; 347:1126-8. [PMID: 25745168 DOI: 10.1126/science.1259063] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Hypervelocity stars (HVSs) travel with velocities so high that they exceed the escape velocity of the Galaxy. Several acceleration mechanisms have been discussed. Only one HVS (US 708, HVS 2) is a compact helium star. Here we present a spectroscopic and kinematic analysis of US 708. Traveling with a velocity of ~1200 kilometers per second, it is the fastest unbound star in our Galaxy. In reconstructing its trajectory, the Galactic center becomes very unlikely as an origin, which is hardly consistent with the most favored ejection mechanism for the other HVSs. Furthermore, we detected that US 708 is a fast rotator. According to our binary evolution model, it was spun-up by tidal interaction in a close binary and is likely to be the ejected donor remnant of a thermonuclear supernova.
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Affiliation(s)
- S Geier
- European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, Germany. Dr. Karl Remeis-Observatory and Erlangen Centre for Astroparticle Physics, Astronomical Institute, Friedrich-Alexander University Erlangen-Nuremberg, Sternwartstraße 7, 96049 Bamberg, Germany.
| | - F Fürst
- Space Radiation Lab, MC 290-17 Cahill, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA
| | - E Ziegerer
- Dr. Karl Remeis-Observatory and Erlangen Centre for Astroparticle Physics, Astronomical Institute, Friedrich-Alexander University Erlangen-Nuremberg, Sternwartstraße 7, 96049 Bamberg, Germany
| | - T Kupfer
- Department of Astrophysics/Institute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen, P.O. Box 9010, 6500 GL Nijmegen, Netherlands
| | - U Heber
- Dr. Karl Remeis-Observatory and Erlangen Centre for Astroparticle Physics, Astronomical Institute, Friedrich-Alexander University Erlangen-Nuremberg, Sternwartstraße 7, 96049 Bamberg, Germany
| | - A Irrgang
- Dr. Karl Remeis-Observatory and Erlangen Centre for Astroparticle Physics, Astronomical Institute, Friedrich-Alexander University Erlangen-Nuremberg, Sternwartstraße 7, 96049 Bamberg, Germany
| | - B Wang
- Key Laboratory of the Structure and Evolution of Celestial Objects, Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
| | - Z Liu
- Key Laboratory of the Structure and Evolution of Celestial Objects, Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China. Argelander-Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
| | - Z Han
- Key Laboratory of the Structure and Evolution of Celestial Objects, Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
| | - B Sesar
- Division of Physics, Mathematics, and Astronomy, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA. Max-Planck-Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany
| | - D Levitan
- Division of Physics, Mathematics, and Astronomy, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA
| | - R Kotak
- Astrophysics Research Center, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UK
| | - E Magnier
- Institute for Astronomy, University of Hawaii at Manoa, Honolulu, HI 96822, USA
| | - K Smith
- Astrophysics Research Center, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UK
| | - W S Burgett
- Institute for Astronomy, University of Hawaii at Manoa, Honolulu, HI 96822, USA
| | - K Chambers
- Max-Planck-Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany
| | - H Flewelling
- Max-Planck-Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany
| | - N Kaiser
- Max-Planck-Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany
| | - R Wainscoat
- Max-Planck-Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany
| | - C Waters
- Institute for Astronomy, University of Hawaii at Manoa, Honolulu, HI 96822, USA
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Rest A, Scolnic D, Foley RJ, Huber ME, Chornock R, Narayan G, Tonry JL, Berger E, Soderberg AM, Stubbs CW, Riess A, Kirshner RP, Smartt SJ, Schlafly E, Rodney S, Botticella MT, Brout D, Challis P, Czekala I, Drout M, Hudson MJ, Kotak R, Leibler C, Lunnan R, Marion GH, McCrum M, Milisavljevic D, Pastorello A, Sanders NE, Smith K, Stafford E, Thilker D, Valenti S, Wood-Vasey WM, Zheng Z, Burgett WS, Chambers KC, Denneau L, Draper PW, Flewelling H, Hodapp KW, Kaiser N, Kudritzki RP, Magnier EA, Metcalfe N, Price PA, Sweeney W, Wainscoat R, Waters C. COSMOLOGICAL CONSTRAINTS FROM MEASUREMENTS OF TYPE Ia SUPERNOVAE DISCOVERED DURING THE FIRST 1.5 yr OF THE Pan-STARRS1 SURVEY. ACTA ACUST UNITED AC 2014. [DOI: 10.1088/0004-637x/795/1/44] [Citation(s) in RCA: 231] [Impact Index Per Article: 23.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Scolnic D, Rest A, Riess A, Huber ME, Foley RJ, Brout D, Chornock R, Narayan G, Tonry JL, Berger E, Soderberg AM, Stubbs CW, Kirshner RP, Rodney S, Smartt SJ, Schlafly E, Botticella MT, Challis P, Czekala I, Drout M, Hudson MJ, Kotak R, Leibler C, Lunnan R, Marion GH, McCrum M, Milisavljevic D, Pastorello A, Sanders NE, Smith K, Stafford E, Thilker D, Valenti S, Wood-Vasey WM, Zheng Z, Burgett WS, Chambers KC, Denneau L, Draper PW, Flewelling H, Hodapp KW, Kaiser N, Kudritzki RP, Magnier EA, Metcalfe N, Price PA, Sweeney W, Wainscoat R, Waters C. SYSTEMATIC UNCERTAINTIES ASSOCIATED WITH THE COSMOLOGICAL ANALYSIS OF THE FIRST PAN-STARRS1 TYPE Ia SUPERNOVA SAMPLE. ACTA ACUST UNITED AC 2014. [DOI: 10.1088/0004-637x/795/1/45] [Citation(s) in RCA: 124] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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