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Exploring the Nu2 Lupi system with CHEOPS

Delrez, Laetitia; CHEOPS consortium

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    <subfield code="x">Delrez et al. 2021, Nature Astronomy, Volume 5, p. 775-787</subfield>
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    <subfield code="a">&lt;p&gt;Multi-transiting planetary systems around bright stars offer unique windows to comparative exoplanetology.&lt;br&gt;
Nu2 Lupi (HD 136352) is a naked-eye (V=5.8) Sun-like star that was discovered to host three low-mass&lt;br&gt;
planets with orbital periods of 11.6, 27.6, and 107.6 days via radial velocity monitoring with HARPS. The&lt;br&gt;
two inner planets (b and c) were recently found to transit by TESS, prompting us to follow up the system&lt;br&gt;
with CHEOPS. This led to the exciting discovery that the outer planet d is also transiting. With its bright&lt;br&gt;
Sun-like star, long period, and mild irradiation (~5.7 times the irradiation of Earth), Nu2 Lupi d unlocks&lt;br&gt;
a completely new region in the parameter space of exoplanets amenable to detailed characterization. We&lt;br&gt;
measured its radius and mass to be 2.56+/-0.09 R_Earth and 8.82+/-0.94 M_Earth, respectively, and refined&lt;br&gt;
the properties of all three planets: planet b likely has a rocky mostly dry composition, while planets c and d&lt;br&gt;
seem to have retained small hydrogen-helium envelopes and a possibly large water fraction. This diversity&lt;br&gt;
of planetary compositions makes the Nu2 Lupi system an excellent laboratory for testing formation and&lt;br&gt;
evolution models of low-mass planets.&lt;/p&gt;</subfield>
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