A Warm Jupiter-sized Planet Transiting the Pre-main-sequence Star V1298 Tau

August 2019 • 2019AJ....158...79D

Authors • David, Trevor J. • Cody, Ann Marie • Hedges, Christina L. • Mamajek, Eric E. • Hillenbrand, Lynne A. • Ciardi, David R. • Beichman, Charles A. • Petigura, Erik A. • Fulton, Benjamin J. • Isaacson, Howard T. • Howard, Andrew W. • Gagné, Jonathan • Saunders, Nicholas K. • Rebull, Luisa M. • Stauffer, John R. • Vasisht, Gautam • Hinkley, Sasha

Abstract • We report the detection of V1298 Tau b, a warm Jupiter-sized planet (R P = 0.91 ± 0.05 R Jup, P = 24.1 days) transiting a young solar analog with an estimated age of 23 Myr. The star and its planet belong to Group 29, a young association in the foreground of the Taurus-Auriga star-forming region. While hot Jupiters have been previously reported around young stars, those planets are non-transiting and near-term atmospheric characterization is not feasible. The V1298 Tau system is a compelling target for follow-up study through transmission spectroscopy and Doppler tomography owing to the transit depth (0.5%), host star brightness (K s = 8.1 mag), and rapid stellar rotation (v\sin i = 23 km s-1). Although the planet is Jupiter-sized, its mass is currently unknown due to high-amplitude radial velocity jitter. Nevertheless, V1298 Tau b may help constrain formation scenarios for at least one class of close-in exoplanets, providing a window into the nascent evolution of planetary interiors and atmospheres.


IPAC Authors


David Ciardi

Senior Scientist


Benjamin Fulton

Assistant Scientist


Luisa Rebull

Senior Research Scientist