Four newborn planets transiting the young solar analog V1298 Tau
Trevor J. David, Erik A. Petigura, Rodrigo Luger, Daniel, Foreman-Mackey, John H. Livingston, Eric E. Mamajek, Lynne A. Hillenbrand

TL;DR
This paper reports the discovery of four young exoplanets orbiting V1298 Tau, providing insights into early planet evolution, atmospheric loss, and system architecture in a young solar analog system.
Contribution
First detection of multiple Neptune- to Saturn-sized planets around a young star, expanding understanding of early planetary system development.
Findings
Three new planets discovered with sizes between Neptune and Saturn.
Planets c and d are near a 3:2 mean-motion resonance.
Estimated low planetary masses suggest ongoing atmospheric cooling.
Abstract
Exoplanets orbiting pre-main sequence stars are laboratories for studying planet evolution processes, including atmospheric loss, orbital migration, and radiative cooling. V1298 Tau, a young solar analog with an age of 23 4 Myr, is one such laboratory. The star is already known to host a Jupiter-sized planet on a 24 day orbit. Here, we report the discovery of three additional planets --- all between the size of Neptune and Saturn --- based on our analysis of K2 Campaign 4 photometry. Planets c and d have sizes of 5.6 and 6.4 , respectively and with orbital periods of 8.25 and 12.40 days reside 0.25% outside of the nominal 3:2 mean-motion resonance. Planet e is 8.7 in size but only transited once in the K2 time series and thus has a period longer than 36 days, but likely shorter than 223 days. The V1298 Tau system may be a precursor to the compact multiplanet…
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