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| Format: | Preprint |
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2025
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| Online-Zugang: | https://arxiv.org/abs/2508.16805 |
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| author | DiTomasso, Victoria Charbonneau, David Vanderburg, Andrew López-Morales, Mercedes Vissapragada, Shreyas Mortier, Annelies Wilson, Thomas G. Incha, Elyse Cameron, Andrew Collier Malavolta, Luca Buchhave, Lars A. Latham, David W. Pinamonti, Matteo Striegel, Stephanie Fausnaugh, Michael Bouma, Luke Falk, Ben Aloisi, Robert Dumusque, Xavier John, A. Anna Lakeland, Ben S. Fiorenzano, A. F. Martínez Naponiello, Luca Nicholson, Belinda Pass, Emily K. Pepe, Francesco Alfonso Rescigno, Federica Sozzetti, Alessandro Turner, Daisy A. Rappaport, Saul A. Omohundro, Mark Powell, Brian P. Gagliano, Robert Jacobs, Thomas L. Kostov, Veselin B. Kristiansen, Martti H. LaCourse, Daryll M. Schmitt, Allan R. Schwengeler, Hans Martin Terentev, Ivan A. |
| author_facet | DiTomasso, Victoria Charbonneau, David Vanderburg, Andrew López-Morales, Mercedes Vissapragada, Shreyas Mortier, Annelies Wilson, Thomas G. Incha, Elyse Cameron, Andrew Collier Malavolta, Luca Buchhave, Lars A. Latham, David W. Pinamonti, Matteo Striegel, Stephanie Fausnaugh, Michael Bouma, Luke Falk, Ben Aloisi, Robert Dumusque, Xavier John, A. Anna Lakeland, Ben S. Fiorenzano, A. F. Martínez Naponiello, Luca Nicholson, Belinda Pass, Emily K. Pepe, Francesco Alfonso Rescigno, Federica Sozzetti, Alessandro Turner, Daisy A. Rappaport, Saul A. Omohundro, Mark Powell, Brian P. Gagliano, Robert Jacobs, Thomas L. Kostov, Veselin B. Kristiansen, Martti H. LaCourse, Daryll M. Schmitt, Allan R. Schwengeler, Hans Martin Terentev, Ivan A. |
| contents | We present the discovery of the planetary system orbiting the bright (V = 7.2), nearby (35 pc), Sun-like star HD 60779, which has a mass of 1.050 +/- 0.044 solar masses and a radius of 1.129 +/- 0.013 solar radii. We report two TESS transits and a subsequent CHEOPS transit of HD 60779 b, a sub-Neptune with a radius of 3.250 (+0.100 / -0.098) Earth radii on a 29.986175 (+0.000030 / -0.000033) day orbit. Additionally, 286 HARPS-N radial velocity measurements reveal the mass of planet b (14.7 +1.1 / -1.0 Earth masses) and the presence of an outer planet, HD 60779 c, with an orbital period of 104.25 (+0.30 / -0.29) days and a minimum mass (m sin i) of 27.7 +/- 1.6 Earth masses. Both 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 radial velocity (129.75 +/- 0.12 km/s) allows its Lyman-alpha 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 sub-Neptune with orbital period greater than 25 days and with both mass and radius measured, distinguishing it in terms of accessibility to spectroscopic characterization. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_16805 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The HD 60779 Planetary System: A Transiting Sub-Neptune on a 30-day Orbit and a More Massive Outer World DiTomasso, Victoria Charbonneau, David Vanderburg, Andrew López-Morales, Mercedes Vissapragada, Shreyas Mortier, Annelies Wilson, Thomas G. Incha, Elyse Cameron, Andrew Collier Malavolta, Luca Buchhave, Lars A. Latham, David W. Pinamonti, Matteo Striegel, Stephanie Fausnaugh, Michael Bouma, Luke Falk, Ben Aloisi, Robert Dumusque, Xavier John, A. Anna Lakeland, Ben S. Fiorenzano, A. F. Martínez Naponiello, Luca Nicholson, Belinda Pass, Emily K. Pepe, Francesco Alfonso Rescigno, Federica Sozzetti, Alessandro Turner, Daisy A. Rappaport, Saul A. Omohundro, Mark Powell, Brian P. Gagliano, Robert Jacobs, Thomas L. Kostov, Veselin B. Kristiansen, Martti H. LaCourse, Daryll M. Schmitt, Allan R. Schwengeler, Hans Martin Terentev, Ivan A. Earth and Planetary Astrophysics We present the discovery of the planetary system orbiting the bright (V = 7.2), nearby (35 pc), Sun-like star HD 60779, which has a mass of 1.050 +/- 0.044 solar masses and a radius of 1.129 +/- 0.013 solar radii. We report two TESS transits and a subsequent CHEOPS transit of HD 60779 b, a sub-Neptune with a radius of 3.250 (+0.100 / -0.098) Earth radii on a 29.986175 (+0.000030 / -0.000033) day orbit. Additionally, 286 HARPS-N radial velocity measurements reveal the mass of planet b (14.7 +1.1 / -1.0 Earth masses) and the presence of an outer planet, HD 60779 c, with an orbital period of 104.25 (+0.30 / -0.29) days and a minimum mass (m sin i) of 27.7 +/- 1.6 Earth masses. Both 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 radial velocity (129.75 +/- 0.12 km/s) allows its Lyman-alpha 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 sub-Neptune with orbital period greater than 25 days and with both mass and radius measured, distinguishing it in terms of accessibility to spectroscopic characterization. |
| title | The HD 60779 Planetary System: A Transiting Sub-Neptune on a 30-day Orbit and a More Massive Outer World |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2508.16805 |