A warm Jupiter-sized planet transiting the pre-main sequence star V1298 Tau. (arXiv:1902.09670v1 [astro-ph.EP])
<a href="http://arxiv.org/find/astro-ph/1/au:+David_T/0/1/0/all/0/1">Trevor J. David</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cody_A/0/1/0/all/0/1">Ann Marie Cody</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hedges_C/0/1/0/all/0/1">Christina L. Hedges</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mamajek_E/0/1/0/all/0/1">Eric E. Mamajek</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hillenbrand_L/0/1/0/all/0/1">Lynne A. Hillenbrand</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ciardi_D/0/1/0/all/0/1">David R. Ciardi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Beichman_C/0/1/0/all/0/1">Charles A. Beichman</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Petigura_E/0/1/0/all/0/1">Erik A. Petigura</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fulton_B/0/1/0/all/0/1">Benjamin J. Fulton</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Isaacson_H/0/1/0/all/0/1">Howard T. Isaacson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Howard_A/0/1/0/all/0/1">Andrew W. Howard</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gagne_J/0/1/0/all/0/1">Jonathan Gagn&#xe9;</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Saunders_N/0/1/0/all/0/1">Nicholas K. Saunders</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rebull_L/0/1/0/all/0/1">Luisa M. Rebull</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Stauffer_J/0/1/0/all/0/1">John R. Stauffer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Vasisht_G/0/1/0/all/0/1">Gautam Vasisht</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hinkley_S/0/1/0/all/0/1">Sasha Hinkley</a>

We report the detection of V1298 Tau b, a warm Jupiter-sized planet ($R_P =
0.90 pm 0.05~ R_mathrm{Jup}, P = 24.1$ days) transiting a young solar analog
with an estimated age of 23 million years. 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 ($vsin{i}$ = 23 km s$^{-1}$).
Although the planet is Jupiter-sized, its mass is presently unknown due to
high-amplitude radial velocity jitter. Nevertheless, V1298 Tau b may help
constrain formation scenarios for at least one class of warm Jupiters,
providing a window into the nascent evolution of giant planet interiors and
atmospheres.

We report the detection of V1298 Tau b, a warm Jupiter-sized planet ($R_P =
0.90 pm 0.05~ R_mathrm{Jup}, P = 24.1$ days) transiting a young solar analog
with an estimated age of 23 million years. 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 ($vsin{i}$ = 23 km s$^{-1}$).
Although the planet is Jupiter-sized, its mass is presently unknown due to
high-amplitude radial velocity jitter. Nevertheless, V1298 Tau b may help
constrain formation scenarios for at least one class of warm Jupiters,
providing a window into the nascent evolution of giant planet interiors and
atmospheres.

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