Events List

DateEvent TypeSpeaker
11/01/2018Physics Dept ColloquiumHoward Stone [ + ]
11/02/2018NYU-CCA LSS Group MtgNYU-CCA LSS Group Mtg [ + ]
11/02/2018ISCISC [ + ]
11/05/2018CCPP Brown BagJohann Brehmer [ + ]
11/05/2018Informal Astro TalkSeunghwan Lim [ + ]
11/05/2018Blanton Tinker Pullen Blanton Tinker Pullen [ + ]
11/06/2018Modjaz Group MtgModjaz Group Mtg [ + ]
11/06/2018Astroparticle Group MeetAstro Particle Group Mtg [ + ]
11/06/2018Astro SeminarApurva Oza [ -- ]

Title: Sodium and Potassium at Close-In Exoplanets: Evidence of Geologically-Active Satellites?
Description: Evidence for geologically-active planetary bodies beyond our Solar System has evaded astronomical detection to date. Here, by analogy to the most active body in the Solar System, Io, I describe the possible Na & K spectral signatures imprinted by the activity occurring on an extrasolar Io. I briefly review calculations that show tidal theory can allow active exomoons to be dynamically stable around extrasolar giant planets. As the geometry and column density of an ejected Na & K cloud depends strongly on the plasma interaction, I provide order of magnitude expressions to probe the influence of an exomoon. I demonstrate that an optically thin cloud of Na or K sourced by an exomoon, is roughly consistent with alkali observations at exoplanets to date. Furthermore, the measured extrasolar Na/K ratios, useful in probing physical processes, are highly non-solar contrary to current giant planet formation scenarios, and more consistent with the ratios observed at differentiated silicate and icy bodies across the Solar System. With the advent of high-resolution transmission spectra, modeling these possibly active systems is now warranted. While the sheer presence of an exomoon around a close-in planet would illuminate our understanding of tidal gravitation, the added utility of a spectral signature may be our first step in detecting the presence of extrasolar activity. Moreover, the Na & K signatures driven by the concomitant heavy ion plasma could be an indication of an exoplanetary magnetic field. (2:00 PM - 3:15 PM, 726 Broadway, 940, CCPP Seminar)
11/07/2018Informal Astro TalkPaz Beniamini [ + ]
11/07/2018HEP SeminarIra Rothstein [ + ]
11/07/2018Astro PhAstro Ph [ + ]
11/08/2018Physics Dept ColloquiumBob Austin [ + ]
11/09/2018ISCISC [ + ]
11/12/2018CCPP Brown BagNO CCPP BROWN BAG TODAY [ + ]
11/12/2018Blanton Tinker Pullen Blanton Tinker Pullen [ + ]
11/12/2018OtherJoshua Ruderman [ + ]
11/13/2018Modjaz Group MtgModjaz Group Mtg [ + ]
11/13/2018Astro SeminarTristan Smith [ + ]
11/13/2018Special SeminarMark Hertzberg [ + ]
11/14/2018Astroparticle Group MeetAstro Particle Group Mtg [ + ]
11/14/2018HEP SeminarArvin Shahbazi-Moghaddam [ + ]
11/14/2018Astro PhAstro Ph [ + ]
11/15/2018Physics Dept ColloquiumShmuel Rubinstein [ + ]
11/16/2018Informal HEP TalkHongwan Liu [ + ]
11/16/2018NYU-CCA NYU-CCA [ + ]
11/16/2018Big Apple ColloquiumAmina Helmi [ + ]
11/16/2018ISCISC [ + ]
11/19/2018Blanton Tinker Pullen Blanton Tinker Pullen [ + ]
11/20/2018Modjaz Group MtgModjaz Group Mtg [ + ]
11/21/2018HEP Seminar [ + ]
11/27/2018Modjaz Group MtgModjaz Group Mtg [ + ]
11/27/2018Astro SeminarJo Dunkley [ + ]
11/28/2018Astroparticle Group MeetAstro Particle Group Mtg [ + ]
11/28/2018HEP SeminarMikhail Shaposhnikov [ + ]
11/28/2018Astro PhAstro Ph [ + ]
11/29/2018Physics Dept ColloquiumScott Tremaine [ + ]
11/30/2018NYU-CCANYU-CCA [ + ]
11/30/2018Special ColloquiumAndrea Maccio [ + ]
11/30/2018ISCISC [ + ]