TESS hunt for young and maturing exoplanets (THYME). III. A two-planet system in the 400 Myr Ursa major group
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Exoplanets can evolve significantly between birth and maturity, as their atmospheres, orbits, and structures are shaped by their environment. Young planets (<1 Gyr) offer an opportunity to probe the critical early stages of this evolution, where planets evolve the fastest. However, most of the known young planets orbit prohibitively faint stars. We present the discovery of two planets transiting HD 63433 (TOI 1726, TIC 130181866), a young Sun-like (M∗=0.99±0.03) star. Through kinematics, lithium abundance, and rotation, we confirm that HD 63433 is a member of the Ursa Major moving group (τ=414±23 Myr). Based on the TESS light curve and updated stellar parameters, we estimate the planet radii are 2.15±0.10R⊕ and 2.67±0.12R⊕, the orbital periods are 7.11 and 20.55 days, and the orbital eccentricities are lower than about 0.2. Using HARPS-N velocities, we measure the Rossiter-McLaughlin signal of the inner planet, demonstrating that the orbit is prograde. Since the host star is bright (V=6.9), both planets are amenable to transmission spectroscopy, radial velocity measurements of their masses, and more precise determination of the stellar obliquity. This system is therefore poised to play an important role in our understanding of planetary system evolution in the first billion years after formation.
Mann , A W , Johnson , M C , Vanderburg , A , Kraus , A L , Rizzuto , A C , Wood , M L , Bush , J L , Rockcliffe , K , Newton , E R , Latham , D W , Mamajek , E E , Zhou , G , Quinn , S N , Thao , P C , Benatti , S , Cosentino , R , Desidera , S , Harutyunyan , A , Lovis , C , Mortier , A , Pepe , F A , Poretti , E , Wilson , T G , Kristiansen , M H , Gagliano , R , Jacobs , T , Lacourse , D M , Omohundro , M , Schwengeler , H M , Terentev , I A , Kane , S R , Hill , M L , Rabus , M , Esquerdo , G A , Berlind , P , Collins , K A , Murawski , G , Sallam , N H , Aitken , M M , Massey , B , Ricker , G R , Vanderspek , R , Seager , S , Winn , J N , Jenkins , J M , Barclay , T , Caldwell , D A , Dragomir , D , Doty , J P , Glidden , A , Tenenbaum , P , Torres , G , Twicken , J D & Villanueva , S 2020 , ' TESS hunt for young and maturing exoplanets (THYME). III. A two-planet system in the 400 Myr Ursa major group ' , Astronomical Journal , vol. 160 , no. 179 , 179 . https://doi.org/10.3847/1538-3881/abae64
Copyright © 2020 The American Astronomical Society. All rights reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.3847/1538-3881/abae64.
DescriptionA.W.M. was supported through NASA's Astrophysics Data Analysis Program (80NSSC19K0583). M.L.W. was supported by a grant through NASA's K2 GO program (80NSSC19K0097). This material is based on work supported by the National Science Foundation Graduate Research Fellowship Program under grant No. DGE-1650116 to P.C.T. A.V.'s work was performed under contract with the California Institute of Technology/Jet Propulsion Laboratory funded by NASA through the Sagan Fellowship Program executed by the NASA Exoplanet Science Institute. D.D. acknowledges support from NASA through Caltech/JPL grant RSA-1006130 and through the TESS Guest Investigator Program grant 80NSSC19K1727.
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