{"683982":{"#nid":"683982","#data":{"type":"event","title":"CRA Seminar | Dr. Arthur Daniel Adams | University of Virginia| Host: Dr. Gongjie Li","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003ESpeaker: \u003C\/strong\u003EDr. Arthur Daniel Adams\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EHost: \u003C\/strong\u003EDr. Gongjie Li\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ETitle: \u003C\/strong\u003EMapping Sub-stellar Companions in Time and Space\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EAbstract:\u003C\/strong\u003E Companion brown dwarfs and exoplanets are complex objects whose time and spatial variability are now being mapped with high-fidelity infrared observations from JWST. I will begin by presenting our analysis of JWST NIRSpec\/IFU PRISM observations of the 2M1207 system that represent the first spectroscopic time monitoring of a planetary-mass companion simultaneously with its host. By monitoring the variability of the system as a whole, we are sensitive both to the time evolution of atmospheric structure --- including through hot spots and clouds --- as well as external variability such as the accretion of disk material. 2M1207 A\u0027s spectra show multiple time-dependent structures across the near-infrared. While we do not see a full rotation within our observations, we do capture non-linear trends in time across much of the spectra, with localized regions showing light curves that hint at the possibility of variability imparted by the circum-stellar disk. The planetary-mass 2M1207 b\u0027s spectra generally corroborate the interpretation of recent atmospheric characterizations, where a simple cloud evolution model can capture most of the short-term variability. Turning to spatial variability, I will also provide a first look at the eclipse mapping of brown dwarfs in orbit around white dwarfs. These systems provide a unique opportunity to study the spatially-resolved structures of highly-irradiated atmospheres. Finally, I will highlight ongoing student research in brown dwarfs and exoplanets at UVA, which includes the spectral and orbital characterization of the aforementioned brown-dwarf\/white-dwarf binaries as a complement to atmospheric studies, as well as classifying the seasonal evolution of Earth\u0027s vegetation as spectral signatures of the response of the majority of Earth\u0027s life by mass\u0026nbsp;to the solar energy budget.\u003C\/p\u003E","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003E\u003Cstrong\u003EAbstract:\u003C\/strong\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003ECompanion brown dwarfs and exoplanets are complex objects whose time and spatial variability are now being mapped with high-fidelity infrared observations from JWST. I will begin by presenting our analysis of JWST NIRSpec\/IFU PRISM observations of the 2M1207 system that represent the first spectroscopic time monitoring of a planetary-mass companion simultaneously with its host. By monitoring the variability of the system as a whole, we are sensitive both to the time evolution of atmospheric structure --- including through hot spots and clouds --- as well as external variability such as the accretion of disk material. 2M1207 A\u0027s spectra show multiple time-dependent structures across the near-infrared. While we do not see a full rotation within our observations, we do capture non-linear trends in time across much of the spectra, with localized regions showing light curves that hint at the possibility of variability imparted by the circum-stellar disk. The planetary-mass 2M1207 b\u0027s spectra generally corroborate the interpretation of recent atmospheric characterizations, where a simple cloud evolution model can capture most of the short-term variability. Turning to spatial variability, I will also provide a first look at the eclipse mapping of brown dwarfs in orbit around white dwarfs. These systems provide a unique opportunity to study the spatially-resolved structures of highly-irradiated atmospheres. Finally, I will highlight ongoing student research in brown dwarfs and exoplanets at UVA, which includes the spectral and orbital characterization of the aforementioned brown-dwarf\/white-dwarf binaries as a complement to atmospheric studies, as well as classifying the seasonal evolution of Earth\u0027s vegetation as spectral signatures of the response of the majority of Earth\u0027s life by mass\u0026nbsp;to the solar energy budget.\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"CRA Seminar |  Dr. Arthur Daniel Adams |Virginia University| Host: Dr. Gongjie Li"}],"uid":"30957","created_gmt":"2025-08-19 21:32:04","changed_gmt":"2025-10-30 18:08:26","author":"Shaun Ashley","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2025-11-13T15:30:00-05:00","event_time_end":"2025-11-13T16:30:00-05:00","event_time_end_last":"2025-11-13T16:30:00-05:00","gmt_time_start":"2025-11-13 20:30:00","gmt_time_end":"2025-11-13 21:30:00","gmt_time_end_last":"2025-11-13 21:30:00","rrule":null,"timezone":"America\/New_York"},"location":"Gilbert Boggs Building Rm B1-44","extras":[],"hg_media":{"678505":{"id":"678505","type":"image","title":"Arthur Daniel Adams.jpg","body":null,"created":"1761847640","gmt_created":"2025-10-30 18:07:20","changed":"1761847640","gmt_changed":"2025-10-30 18:07:20","alt":"Arthur Daniel Adams.jpg","file":{"fid":"262552","name":"Pic-for-seminar.jpg","image_path":"\/sites\/default\/files\/2025\/10\/30\/Pic-for-seminar.jpg","image_full_path":"http:\/\/hg.gatech.edu\/\/sites\/default\/files\/2025\/10\/30\/Pic-for-seminar.jpg","mime":"image\/jpeg","size":685988,"path_740":"http:\/\/hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/2025\/10\/30\/Pic-for-seminar.jpg?itok=Z4Eq3Xky"}}},"media_ids":["678505"],"groups":[{"id":"126011","name":"School of Physics"}],"categories":[],"keywords":[{"id":"166937","name":"School of Physics"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}