August
2026
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2026AJ....172...97D
Authors
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DiTomasso, Victoria
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Charbonneau, David
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Vanderburg, Andrew
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López-Morales, Mercedes
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Vissapragada, Shreyas
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Mortier, Annelies
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Wilson, Thomas G.
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Incha, Elyse
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Collier Cameron, Andrew
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Malavolta, Luca
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Buchhave, Lars A.
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Latham, David W.
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Pinamonti, Matteo
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Striegel, Stephanie
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Fausnaugh, Michael
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Bouma, Luke
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Falk, Ben
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Aloisi, Robert
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Dumusque, Xavier
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John, A. Anna
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Lakeland, Ben S.
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Martínez Fiorenzano, A. F.
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Naponiello, Luca
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Nicholson, Belinda
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Pass, Emily K.
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Pepe, Francesco Alfonso
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Rescigno, Federica
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Sozzetti, Alessandro
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Turner, Daisy A.
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Rappaport, Saul A.
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Omohundro, Mark
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Powell, Brian P.
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Gagliano, Robert
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Jacobs, Thomas L.
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Kostov, Veselin B.
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Kristiansen, Martti H.
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LaCourse, Daryll M.
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Schmitt, Allan R.
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Schwengeler, Hans Martin
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Terentev, Ivan A.
Abstract
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We present the discovery of the planetary system orbiting the bright (V = 7.2), nearby (35 pc), Sun-like (M⋆ = 1.050 ± 0.044 M⊙, R⋆ = 1.129 ± 0.013 R⊙) star, HD 60779. We report two Transiting Exoplanet Survey Satellite transits and a subsequent Characterising Exoplanet Satellite transit of HD 60779 b, a sub-Neptune ( 3.246−0.097+0.100R⊕ ) planet on a 29.986175−0.000033+0.000030day orbit. Additionally, 313 High Accuracy Radial velocity Planet Searcher for the Northern hemisphere radial velocity (RV) measurements reveal the mass of planet b ( 14.19−0.96+0.97M⊕ ) and the presence of an outer planet, HD 60779 c (Porb = 104.79 ± 0.23 days, Mpsini=28.3±1.5M⊕ ). Both of these planets' orbits are consistent with being circular, suggesting that they have a dynamically quiet history. The data are not sufficient to determine whether planet c transits. HD 60779's uniquely high systemic RV (129.75 ± 0.12 km s−1) allows its Lyα emission to avoid absorption by the interstellar medium, making it a prime candidate for probing atmospheric escape from HD 60779 b. HD 60779 is also the third brightest host of a Porb > 25 day sub-Neptune with a measured mass and radius, distinguishing it in terms of accessibility to spectroscopic characterization.
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