text: 486,152,1309170590901829635,1116002690604130305,Juliette Becker,"The K2-266 system has a unique geometry, in which an ultra-short period (USP) planet resides significantly misaligned to a system of tightly packed inner planets (STIP). In our new paper (<LINK>), we present two ways this geometry can form. <LINK> Although we don’t know which hypothesis is correct for K2-266, they’re both possibilities for this system and other systems with similar geometries! One way for this to happen is to have an additional unseen planet in the system. Depending on its exact orbital parameters, such a companion can cause an initially coplanar USP-STIP system to become misaligned. <LINK> A second option to get this geometry is for the system to assemble while the star is still somewhat young and has a significant quadrupole moment. This, combined with a slight stellar obliquity with respect to the planet-forming disk, can also cause the USP-STIP misalignment. For more details, please check out either the paper (<LINK>) or a short summary I wrote on my website (<LINK>). Thanks to all my coauthors on this work, @kbatygin, Dan Fabrycky, Fred Adams, @astroplum, Andrew Vanderburg, and @Astro_JRod @ExoCytherean @kbatygin @astroplum @Astro_JRod Thanks! I'll be interested to hear what you think!",https://arxiv.org/abs/2009.10745,"Ultra-short period planets provide a window into the inner edge of the parameter space occupied by planetary orbits. In one particularly intriguing class of multi-planet systems, the ultra-short period planet is flanked by short-period companions, and the outer planets occupy a discernibly distinct dynamical state. In the observational database, this phenomenon is represented by a small number of stars hosting systems of tightly packed co-planar planets as well as an ultra-short period planet, whose orbit of is misaligned relative to the mutual plane of the former. In this work, we explore two different mechanisms that can produce an ultra-short period planet that is misaligned with the rest of its compact planetary system: natural decoupling between the inner and outer system via the stellar quadrupole moment, and decoupling forced by an external companion with finely-tuned orbital parameters. These two processes operate with different timescales, and can thus occur simultaneously. In this work, we use the K2-266 system as an illustrative example to elucidate the dynamics of these two processes, and highlight the types of constraints that may arise regarding the dynamical histories of systems hosting ultra-short period planets. ","The Origin of Systems of Tightly Packed Inner Planets with Misaligned,