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A young progenitor for the most common planetary systems in the Galaxy - Nature

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By John H Livingston, Erik Petigura, James Owen, David Nesvorný, Mayuko Mori, Akihiko Fukui, Jaume Miquel, Felipe Murgas, Hannu Parviainen, Judith Korth, Nestor Garcia, Norio Narita, Enric Pallé, Motohide Tamura, Allyson Bieryla, Andrew Mann, Andrew Vanderburg, Suvrath Mahadevan, Kamen Todorov, Jean-Michel Désert, Jesus Higuera
| Nature Verified
Abstract The Galaxy’s most common known planetary systems have several Earth-to-Neptune-size planets in compact orbits1. At small orbital separations, larger planets are less common than their smaller counterparts by an order of magnitude. The young star V1298 Tau hosts one such compact planetary system, albeit with four planets that are uncommonly large (5 to 10 Earth radii)2,3. The planets form a chain of near-resonances that result in transit-timing variations of several hours.
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The metal-poor atmosphere of a potential sub-Neptune progenitor - Nature Astronomy

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By Jean-Michel Désert, Robin Baeyens, Michael R. Line, John H Livingston, Bob Jacobs, Hinna Shivkumar, Kamen Todorov, Lorenzo Pino, Saugata Barat
| Nature Verified
Abstract Young transiting exoplanets offer a unique opportunity to characterize the atmospheres of freshly formed and evolving planets. We present the transmission spectrum of V1298 Tau b, a 23-Myr-old warm Jupiter-sized (0.91 ± 0.05 RJ, where RJ is the radius of Jupiter) planet orbiting a pre-main-sequence star.
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