A sub-Neptune transiting the young field star HD 18599 at 40 pc

Dr. Rabus, Markus; De Leon, J.; Livingston, J.; Jenkins, S.; Vines, J.; Wittenmyer, R.; Clark, J.; Winn, J.; Addison, B.; Ballard, S.; Bayliss, D.; Beichman, C.; Benneke, B.; Berardo, D.; Bowler, B.; Brown, T.; Bryant, E.; Christiansen, J.; Ciardi, D.; Collins, K.; Crossfield, I.; Deming, D.; Dragomir, D.; Dressing, C.; Fukui, A.; Gan, T.; Giacalone, S.; Gill, S.; Gorjian, V.; Gonzalez-Álvarez, E.; Hesse, K.; Horner, J.; Howell, S.; Jenkins, J.; Kane, S.; Kendall, A.; Kielkopf, J.; Kreidberg, L.; Latham, D.; Liu, H.; Lund, M.; Matson, R.; Matthews, E.; Mengel, M.; Morales, F.; Mori, M.; Narita, N.; Nishiumi, T.; Okumura, J.; Plavchan, P.; Quinn, S.; Ricker, G.; Rudat, A.; Schlieder, J.; Schwarz, R.; Seager, S.; Shporer, A.; Smith, A.; Stassun, K.; Tamura, M.; Tan, T.; Tinney, C.; Vanderspek, R.; Werner, M.; West, R.; Wright, D.; Zhang, H.; Zhou, G.

doi:10.1093/mnras/stad894

Dr. Rabus, Markus

Facultad de Ingeniería

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De Leon, J.

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Livingston, J.

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Jenkins, S.

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Vines, J.

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Wittenmyer, R.

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Clark, J.

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Winn, J.

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Addison, B.

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Ballard, S.

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Bayliss, D.

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Beichman, C.

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Benneke, B.

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Berardo, D.

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Bowler, B.

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Brown, T.

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Bryant, E.

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Christiansen, J.

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Ciardi, D.

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Collins, K.

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Collins, K.

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Crossfield, I.

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Deming, D.

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Dragomir, D.

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Dressing, C.

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Fukui, A.

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Gan, T.

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Giacalone, S.

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Gill, S.

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Gorjian, V.

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Gonzalez-Álvarez, E.

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Hesse, K.

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Horner, J.

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Howell, S.

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Jenkins, J.

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Kane, S.

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Kendall, A.

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Kielkopf, J.

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Kreidberg, L.

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Latham, D.

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Liu, H.

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Lund, M.

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Matson, R.

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Matthews, E.

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Mengel, M.

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Morales, F.

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Mori, M.

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Narita, N.

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Nishiumi, T.

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Okumura, J.

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Plavchan, P.

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Quinn, S.

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Ricker, G.

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Rudat, A.

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Schlieder, J.

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Schwarz, R.

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Seager, S.

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Shporer, A.

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Smith, A.

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Stassun, K.

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Tamura, M.

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Tan, T.

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Tinney, C.

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Vanderspek, R.

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Werner, M.

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West, R.

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Wright, D.

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Zhang, H.

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Zhou, G.

10.1093/mnras/stad894

Monthly Notices of the Royal Astronomical Society

2023

Transiting exoplanets orbiting young nearby stars are ideal laboratories for testing theories of planet formation and evolution. However, to date only a handful of stars with age <1 Gyr have been found to host transiting exoplanets. Here we present the discovery and validation of a sub-Neptune around HD 18599, a young (300 Myr), nearby (d = 40 pc) K star. We validate the transiting planet candidate as a bona fide planet using data from the TESS, Spitzer, and Gaia missions, ground-based photometry from IRSF, LCO, PEST, and NGTS, speckle imaging from Gemini, and spectroscopy from CHIRON, NRES, FEROS, and MINERVA-Australis. The planet has an orbital period of 4.13 d, and a radius of 2.7 R⊕. The RV data yields a 3-σ mass upper limit of 30.5 M⊕ which is explained by either a massive companion or the large observed jitter typical for a young star. The brightness of the host star (V∼9 mag) makes it conducive to detailed characterization via Doppler mass measurement which will provide a rare view into the interior structure of young planets.

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