{"id":30788,"date":"2022-06-24T13:32:02","date_gmt":"2022-06-24T11:32:02","guid":{"rendered":"https:\/\/karmaka.de\/?p=30788"},"modified":"2022-06-24T13:32:04","modified_gmt":"2022-06-24T11:32:04","slug":"probing-the-surface-environment-of-large-t-type-asteroids","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=30788","title":{"rendered":"Probing the surface environment of large T-type asteroids<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Yuna G. Kwon, Sunao Hasegawa, Sonia Fornasier, Masateru Ishiguro, Jessica Agarwal<\/p>\n\n\n\n<p>Accepted for publication in Astronomy &amp; Astrophysics<\/p>\n\n\n\n<p><a href=\"https:\/\/arxiv.org\/abs\/2206.11672\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/arxiv.org\/pdf\/2206.11672\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;We probed the surface environment of large (&gt;80 km in diameter) T-type asteroids, a taxonomic type relatively ill-constrained as an independent group, and discussed their place of origin. We performed spectroscopic observations of two T-type asteroids, (96) Aegle and (570) Kythera, over 2.8&#8211;4.0 \u03bcm using the Subaru telescope. With other T-types&#8217; spectra available in the literature and survey datasets, we strove to find commonalities and global trends in this group. We also utilised the asteroids&#8217; polarimetric data and meteorite spectra to constrain their surface texture and composition. Our targets exhibit red L-band continuum slopes similar to (1) Ceres and 67P\/Churyumov-Gerasimenko, and have an OH-absorption feature with band centres &lt;2.8 \u03bcm. (96) Aegle hints at a shallow N&#8211;H band near 3.1 \u03bcm and C&#8211;H band of organic materials over 3.4&#8211;3.6 \u03bcm, whereas no diagnostic bands of water ice and other volatiles exceeding the noise of the data were seen for both asteroids. The large T-type asteroids but (596) Scheila display similar spectral shapes to our targets. \u223c50 \\% of large T-types contain an absorption band near 0.6&#8211;0.65 \u03bcm likely associated with hydrated minerals. For T-type asteroids (except Jupiter Trojans) of all sizes, we found a weak correlation: the smaller the diameter and the closer the Sun, the redder the visible slope. The 2.9-\u03bcm band depths of large T-types suggest that they might have experienced aqueous alteration comparable to Ch-types but more intense than most of the main-belt asteroids. The polarimetric phase curve of the T-types is well described by a particular surface structure and their 0.5&#8211;4.0 \u03bcm reflectance spectra appear most similar to CI chondrites with grain sizes of \u223c25&#8211;35 \u03bcm. Taken as a whole, we propose that large T-type asteroids might be dislodged roughly around 10 au in the early solar system. &#8220;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Yuna G. Kwon, Sunao Hasegawa, Sonia Fornasier, Masateru Ishiguro, Jessica Agarwal Accepted for publication in Astronomy &amp; Astrophysics LINK (OPEN ACCESS)PDF (OPEN ACCESS) &#8220;We probed the surface environment of large (&gt;80 km in diameter) T-type&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[61,77,9,6243,10,130,1184,6194],"tags":[6330,6332,6331,1771,3273,5820,1809,1479,1480,6329],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/30788"}],"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=30788"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/30788\/revisions"}],"predecessor-version":[{"id":30789,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/30788\/revisions\/30789"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=30788"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=30788"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=30788"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}