A Compact Multi-Planet System With A Significantly Misaligned Ultra Short Period Planet
Joseph E. Rodriguez, Juliette C. Becker, Jason D. Eastman, Sam Hadden,, Andrew Vanderburg, Tali Khain, Samuel N. Quinn, Andrew Mayo, Courtney D., Dressing, Joshua E. Schlieder, David R. Ciardi, David W. Latham, Saul, Rappaport, Fred C. Adams, Perry Berlind, Allyson Bieryla

TL;DR
This paper reports the discovery of a compact multi-planet system around K2-266, highlighting a significantly misaligned ultra-short period planet and potential for atmospheric studies with upcoming telescopes.
Contribution
It presents the identification and validation of up to six planets in the K2-266 system, including a notably misaligned ultra-short period planet, and discusses implications for planetary formation.
Findings
Six potential planets identified around K2-266.
One planet exhibits a significantly misaligned orbit.
Two planets confirmed via transit timing variations.
Abstract
We report the discovery of a compact multi-planet system orbiting the relatively nearby (78pc) and bright () K-star, K2-266 (EPIC248435473). We identify up to six possible planets orbiting K2-266 with estimated periods of P = 0.66, P = 6.1, P = 7.8, P = 14.7, P = 19.5, and P = 56.7 days and radii of R = 3.3 R, 0.646 R, 0.705 R, 2.93 R, 2.73 R, and 0.90 R, respectively. We are able to confirm the planetary nature of two of these planets (d & e) from analyzing their transit timing variations ( and ), confidently validate the planetary nature of two other planets (b & c), and classify the last two as planetary candidates (K2-266.02 & .06). From a simultaneous fit of all 6 possible planets, we find that K2-266 b's…
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