{"id":16363,"date":"2018-09-24T22:53:05","date_gmt":"2018-09-24T20:53:05","guid":{"rendered":"http:\/\/karmaka.de\/?p=16363"},"modified":"2018-09-24T22:53:05","modified_gmt":"2018-09-24T20:53:05","slug":"mgs%e2%80%90tes-spectra-suggest-a-basaltic-component-in-the-regolith-of-phobos","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=16363","title":{"rendered":"MGS\u2010TES spectra suggest a basaltic component in the regolith of Phobos<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"<p>Timothy D. Glotch, Christopher S. Edwards, Mehmet Yesiltas, Katherine A. Shirley, Dylan S. McDougall, Alexander M. Kling, Joshua L. Bandfield, Christopher D. K. Herd<\/p>\n<p>Journal of Geophysical Research: Planets, 123. https:\/\/doi.org\/10.1029\/2018JE005647<\/p>\n<p><a href=\"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/abs\/10.1029\/2018JE005647\" target=\"_blank\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br \/>\n<a href=\"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/epdf\/10.1029\/2018JE005647\" target=\"_blank\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n<p>&#8220;The origins of the Martian moons Phobos and Deimos have been the subjects of considerable debate. Visible and near\u2010infrared (VNIR) spectra of these bodies are dark and nearly featureless, with red slopes of varying degrees. These spectra are generally consistent with those of carbonaceous asteroids, leading to the hypothesis that Phobos and Deimos are captured carbonaceous asteroids. The shapes and inclinations of the orbits of Phobos and Deimos present problems for the asteroid capture hypothesis. This had led researchers to suggest that Phobos and Deimos co\u2010accreted with Mars or that they are the result of an impact with Mars or in the Mars vicinity.<\/p>\n<p>In this work, we re\u2010examine Mars Global Surveyor Thermal Emission Spectrometer (MGS\u2010TES) data of Phobos and compare spectra of the Phobos surface to mid\u2010IR spectra of the ungrouped C2 meteorite Tagish Lake (a suggested analog for D\u2010class asteroids) and particulate basalt and phyllosilicate samples (mixed with carbon black to reduce their visible albedos) acquired in a simulated airless body environment. We find that Tagish Lake is a poor mid\u2010IR spectral analog to Phobos and that major spectral features in the Phobos spectrum are best matched by a silicate transparency feature similar to that found for finely particulate basalt. Other features in the spectrum are likely best explained by a phyllosilicate component. We suggest that these results indicate that at a portion of the Phobos surface regolith is derived from the Martian crust.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Timothy D. Glotch, Christopher S. Edwards, Mehmet Yesiltas, Katherine A. Shirley, Dylan S. McDougall, Alexander M. Kling, Joshua L. Bandfield, Christopher D. K. Herd Journal of Geophysical Research: Planets, 123. https:\/\/doi.org\/10.1029\/2018JE005647 LINK (OPEN ACCESS) PDF&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[77,3424,122,4114],"tags":[1449,4687,798,463],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/16363"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=16363"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/16363\/revisions"}],"predecessor-version":[{"id":16364,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/16363\/revisions\/16364"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=16363"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=16363"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=16363"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}