October 11, 2021 Presentation Open Access

Delrez, Laetitia; CHEOPS consortium

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    "description": "<p>Multi-transiting planetary systems around bright stars offer unique windows to comparative exoplanetology.<br>\nNu2 Lupi (HD 136352) is a naked-eye (V=5.8) Sun-like star that was discovered to host three low-mass<br>\nplanets with orbital periods of 11.6, 27.6, and 107.6 days via radial velocity monitoring with HARPS. The<br>\ntwo inner planets (b and c) were recently found to transit by TESS, prompting us to follow up the system<br>\nwith CHEOPS. This led to the exciting discovery that the outer planet d is also transiting. With its bright<br>\nSun-like star, long period, and mild irradiation (~5.7 times the irradiation of Earth), Nu2 Lupi d unlocks<br>\na completely new region in the parameter space of exoplanets amenable to detailed characterization. We<br>\nmeasured its radius and mass to be 2.56+/-0.09 R_Earth and 8.82+/-0.94 M_Earth, respectively, and refined<br>\nthe properties of all three planets: planet b likely has a rocky mostly dry composition, while planets c and d<br>\nseem to have retained small hydrogen-helium envelopes and a possibly large water fraction. This diversity<br>\nof planetary compositions makes the Nu2 Lupi system an excellent laboratory for testing formation and<br>\nevolution models of low-mass planets.</p>", 
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    "title": "Exploring the Nu2 Lupi system with CHEOPS", 
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      "title": "Nature Astronomy"
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    "references": [
      "Delrez et al. 2021, Nature Astronomy, Volume 5, p. 775-787"
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    "publication_date": "2021-10-11", 
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        "affiliation": "University of Liege", 
        "name": "Delrez, Laetitia"
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    "notes": "Contributed talk presented at the PLATO Mission Conference 2021.", 
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