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Exploring the Nu2 Lupi system with CHEOPS

Delrez, Laetitia; CHEOPS consortium


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{
  "publisher": "Zenodo", 
  "DOI": "10.5281/zenodo.5566450", 
  "container_title": "Nature Astronomy", 
  "title": "Exploring the Nu2 Lupi system with CHEOPS", 
  "issued": {
    "date-parts": [
      [
        2021, 
        10, 
        11
      ]
    ]
  }, 
  "abstract": "<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>", 
  "author": [
    {
      "family": "Delrez, Laetitia"
    }, 
    {
      "family": "CHEOPS consortium"
    }
  ], 
  "page": "775-787", 
  "volume": "5", 
  "note": "Contributed talk presented at the PLATO Mission Conference 2021.", 
  "type": "speech", 
  "id": "5566450"
}
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