{"id":33849,"date":"2023-05-09T10:11:00","date_gmt":"2023-05-09T08:11:00","guid":{"rendered":"https:\/\/karmaka.de\/?p=33849"},"modified":"2023-06-06T10:15:03","modified_gmt":"2023-06-06T08:15:03","slug":"the-increasingly-strange-polarimetric-behavior-of-the-barbarian-asteroids","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=33849","title":{"rendered":"The Increasingly Strange Polarimetric Behavior of the Barbarian Asteroids<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Joseph R. Masiero, Maxime Devogele, Isabella Macias, Joahan Castaneda Jaimes, Alberto Cellino<\/p>\n\n\n\n<p><a href=\"https:\/\/arxiv.org\/pdf\/2305.04880.pdf\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;Polarization phase-curve measurements provide a unique constraint on the surface properties of asteroids that are complementary to those from photometry and spectroscopy, and have led to the identification of the &#8220;Barbarian&#8221; asteroids as a class of objects with highly unusual surfaces. We present new near-infrared polarimetric observations of six Barbarian asteroids obtained with the WIRC+Pol instrument on the Palomar Hale telescope. We find a dramatic change in polarimetric behavior from visible to near-infrared for these objects, including a change in the polarimetric inversion angle that is tied to the index of refraction of the surface material. Our observations support a two-phase surface composition consisting of high albedo, high index of refraction inclusions with a small optical size scale embedded in a dark matrix material more closely related to C-complex asteroids. These results are consistent with the interpretation that the Barbarians are remnants of a population of primitive bodies that formed shortly after CAIs. Near-infrared polarimetry provides a direct test of the constituent grains of asteroid surfaces. &#8220;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Joseph R. Masiero, Maxime Devogele, Isabella Macias, Joahan Castaneda Jaimes, Alberto Cellino PDF (OPEN ACCESS) &#8220;Polarization phase-curve measurements provide a unique constraint on the surface properties of asteroids that are complementary to those from photometry&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[77,2350,130,1184],"tags":[1854,1771,4328,1974,1127,3991,1479],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/33849"}],"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=33849"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/33849\/revisions"}],"predecessor-version":[{"id":33850,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/33849\/revisions\/33850"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=33849"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=33849"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=33849"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}