Helmi stream

<h2 id="extragalactic-planet">Extragalactic planet</h2>
<p>The Helmi stream was briefly believed to be home to the first discovered <a href="/facts/Exoplanet/zjfmqfUf">planet</a> purportedly of <a href="/facts/Extragalactic_planet/DSFdLFDf">extragalactic origin</a>, orbiting the star <a href="/facts/HIP_13044/SJIShpr8">HIP 13044</a>.<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a> However, further analysis of radial velocity data failed to confirm the discovery.<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a>
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<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/List_of_stellar_streams/QAzPSXnH">List of stellar streams</a></li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>Scientific American, "Extragalactic Expat: Newfound Exoplanet Likely Came from Another Galaxy", John Matson , 18 November 2010 <a href="http://www.scientificamerican.com/article.cfm?id=extragalactic-planet" target="_blank">http://www.scientificamerican.com/article.cfm?id=extragalactic-planet</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>"Amina Helmi, the "archeologist of the Milky Way," explains how our own galaxy could unlock the mystery of dark matter". FBBVA. 12 December 2017. Retrieved 7 November 2019. The idea had already been mooted that the merging of small galaxies could have played a major part in forming today's giant structures. Helmi developed the tools that were able to test this hypothesis and confirm that it held true, at least for the Milky Way.
 <a href="https://www.fbbva.es/en/noticias/amina-helmi-the-archeologist-of-the-milky-way-explains-how-our-own-galaxy-could-unlock-the-mystery-of-dark-matter/" target="_blank">https://www.fbbva.es/en/noticias/amina-helmi-the-archeologist-of-the-milky-way-explains-how-our-own-galaxy-could-unlock-the-mystery-of-dark-matter/</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
<li id="fn:3"><p>Skibba, Ramin (10 June 2021). "A galactic archaeologist digs into the Milky Way's history". Knowable Magazine. doi:10.1146/knowable-060921-1. S2CID 236290725. Retrieved 4 August 2022. <a href="https://knowablemagazine.org/article/physical-world/2021/a-galactic-archaeologist-digs-milky-ways-history" target="_blank">https://knowablemagazine.org/article/physical-world/2021/a-galactic-archaeologist-digs-milky-ways-history</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li>
<li id="fn:4"><p>"Amina Helmi, the "archeologist of the Milky Way," explains how our own galaxy could unlock the mystery of dark matter". FBBVA. 12 December 2017. Retrieved 7 November 2019. The idea had already been mooted that the merging of small galaxies could have played a major part in forming today's giant structures. Helmi developed the tools that were able to test this hypothesis and confirm that it held true, at least for the Milky Way.
 <a href="https://www.fbbva.es/en/noticias/amina-helmi-the-archeologist-of-the-milky-way-explains-how-our-own-galaxy-could-unlock-the-mystery-of-dark-matter/" target="_blank">https://www.fbbva.es/en/noticias/amina-helmi-the-archeologist-of-the-milky-way-explains-how-our-own-galaxy-could-unlock-the-mystery-of-dark-matter/</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li>
<li id="fn:5"><p>Burgasser, Adam J.; Schneider, Adam C.; Meisner, Aaron M.; Caselden, Dan; Hsu, Chih-Chun; Gerasimov, Roman; Aganze, Christian; Softich, Emma; Karpoor, Preethi; Theissen, Christopher A.; Brooks, Hunter; Bickle, Thomas P.; Gagné, Jonathan; Artigau, Étienne; Marsset, Michaël; Rothermich, Austin; Faherty, Jacqueline K.; Kirkpatrick, J. Davy; Kuchner, Marc J.; Andersen, Nikolaj Stevnbak; Beaulieu, Paul; Colin, Guillaume; Gantier, Jean Marc; Gramaize, Leopold; Hamlet, Les; Hinckley, Ken; Kabatnik, Martin; Kiwy, Frank; Martin, David W.; Massat, Diego H.; Pendrill, William; Sainio, Arttu; Schümann, Jörg; Thévenot, Melina; Walla, Jim; Wędracki, Zbigniew; the Backyard Worlds: Planet 9 Collaboration (2 November 2024). "New Cold Subdwarf Discoveries from Backyard Worlds and a Metallicity Classification System for T Subdwarfs". arXiv:2411.01378 [astro-ph].{{cite arXiv}}:  CS1 maint: numeric names: authors list (link) <a href="/wiki/ArXiv_(identifier)" target="_blank">/wiki/ArXiv_(identifier)</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li>
<li id="fn:6"><p>Scientific American, "Extragalactic Expat: Newfound Exoplanet Likely Came from Another Galaxy", John Matson , 18 November 2010 <a href="http://www.scientificamerican.com/article.cfm?id=extragalactic-planet" target="_blank">http://www.scientificamerican.com/article.cfm?id=extragalactic-planet</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li>
<li id="fn:7"><p>Jones, M. I.; Jenkins, J. S. (2014). "No evidence of the planet orbiting the extremely metal-poor extragalactic star HIP 13044". Astronomy & Astrophysics. 562: id.A129. arXiv:1401.0517. Bibcode:2014A&A...562A.129J. doi:10.1051/0004-6361/201322132. S2CID 55365608. <a href="/wiki/ArXiv_(identifier)" target="_blank">/wiki/ArXiv_(identifier)</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li>
</ol>

Helmi stream open-in-new

Helmi stream