{ "144973-21896218": { "datetime_modified":"20260216T114101", "datetime_start":"20260226T160000", "datetime_end":"20260226T170000", "has_end_time":1, "date_start":"2026-02-26", "date_end":"2026-02-26", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"The Department of Astronomy 2025-2026 Colloquium Series Presents:", "occurrence_title":"", "combined_title":"The Department of Astronomy 2025-2026 Colloquium Series Presents:: Dr. Juliette Becker, Assistant Professor, University of Wisconsin-Madison", "event_subtitle":"Dr. Juliette Becker, Assistant Professor, University of Wisconsin-Madison", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"\"Companions as Clues: Understanding Hot Jupiter Formation\"\n\nHot Jupiters were long thought to be lonely planets. This correctly describes the majority of the population and strongly motivates high-eccentricity tidal migration as the most common method of taking a hot Jupiter to its final short-period orbit. However, a growing number of systems now reveal nearby planetary companions. In this talk, I will discuss recent theoretical and observational results exploring the origin and evolution of hot Jupiters, with a particular focus on those with adjacent companion planets. I show that high-eccentricity tidal migration is generally incompatible with the survival of close-in companions except in very particular scenarios. I further demonstrate that while inner companions are dynamically robust, outer companions can be driven out of the transiting plane through secular interactions, stellar evolution, and stellar obliquity, potentially explaining their apparent absence in some systems. With this in mind, I present the discovery and characterization of the TOI-4468 system as a case study, highlighting how its unique architecture (an outer companion planet, but no inner companion) constrains its dynamical history. The full observational evidence suggests that while most isolated hot Jupiters likely formed through tidal migration, systems with nearby companions preferentially assembled in dynamically cold, disk-mediated ways, revealing multiple formation pathways for close-in giant planets.", "occurrence_notes":null, "guid":"144973-21896218@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/144973", "building_id":"1000165", "building_name":"Weiser Hall", "campus_maps_id":"47", "room":"182", "location_name":"Weiser Hall", "has_livestream":0, "cost":"", "tags":["astronomy","astrophysics"], "website":"https:\/\/lsa.umich.edu\/astro", "sponsors":[ { "group_name":"Department of Astronomy", "group_id":"1178", "website":"" }, { "group_name":"Department of Physics", "group_id":"1965", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/02\/event_144973_original-1.png", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/02\/event_144973_original-1.png", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/02\/event_144973_original-1.png", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/02\/event_144973_original-1.png", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/02\/event_144973_original-1.png", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2026\/02\/event_144973_original-1.png", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2026\/02\/event_144973_original-1.png", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2026\/02\/event_144973_original-1.png", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2026\/02\/event_144973_original-1.png", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2026\/02\/event_144973_original-1.png", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2026\/02\/event_144973_original-1.png", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/02\/event_144973_original-1.png", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/02\/event_144973_original-1.png", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2026\/02\/event_144973_original-1.png", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2026\/02\/event_144973_original-1.png", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/02\/event_144973_original-1.png" }, "occurrence_count":1, "first_occurrence":21896218 } , "138414-21882919": { "datetime_modified":"20260120T102309", "datetime_start":"20260226T160000", "datetime_end":"20260226T171500", "has_end_time":1, "date_start":"2026-02-26", "date_end":"2026-02-26", "time_start":"16:00:00", "time_end":"17:15:00", "time_zone":"America\/Detroit", "event_title":"Zwitterionic Interfaces for Implantable Biomaterials", "occurrence_title":"", "combined_title":"Zwitterionic Interfaces for Implantable Biomaterials: Zhiqiang Cao (Wayne State University)", "event_subtitle":"Zhiqiang Cao (Wayne State University)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"A primary challenge in implantable biomaterials is the host response at the tissue-material interface. Protein adsorption, immune activation, and fibrotic encapsulation gradually isolate implants from surrounding tissues and restrict transport, often leading to failure of both drug-delivery devices and cell therapies. In this talk, I will describe our work using zwitterionic polymer materials to engineer this interface and how it improves tissue compatibility and functional integration of implanted systems in the subcutaneous space. I will present results showing enhanced durability and performance of both encapsulated islet grafts and insulin-delivery catheters. I will also discuss mechanistic studies on how zwitterionic interfaces influence inflammatory and fibrotic pathways while preserving molecular transport. Finally, I will briefly introduce zwitterionic formulations developed for anti-adhesion applications.", "occurrence_notes":null, "guid":"138414-21882919@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/138414", "building_id":"1000158", "building_name":"Chemistry Dow Lab", "campus_maps_id":"34", "room":"1640", "location_name":"Chemistry Dow Lab", "has_livestream":0, "cost":"", "tags":["Chemistry","Materials Science","Science"], "website":"https:\/\/engineering.wayne.edu\/profile\/et8761", "sponsors":[ { "group_name":"Department of Chemistry", "group_id":"3761", "website":"https:\/\/lsa.umich.edu\/chem" }, { "group_name":"Materials Chemistry", "group_id":"4388", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21882919 } }