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Transit detection of the long-period volatile-rich super-Earth ν2 Lupi d with CHEOPS

Delrez, L. ; Davies, Melvyn B LU and Walton, Nicholas A. (2021) In Nature Astronomy 5(8). p.775-787
Abstract
Exoplanets transiting bright nearby stars are key objects for advancing our knowledge of planetary formation and evolution. The wealth of photons from the host star gives detailed access to the atmospheric, interior and orbital properties of the planetary companions. ν² Lupi (HD 136352) is a naked-eye (V = 5.78) Sun-like star that was discovered to host three low-mass planets with orbital periods of 11.6, 27.6 and 107.6 d via radial-velocity monitoring. The two inner planets (b and c) were recently found to transit, prompting a photometric follow-up by the brand new Characterising Exoplanets Satellite (CHEOPS). Here, we report that the outer planet d is also transiting, and measure its radius and mass to be 2.56 ± 0.09 R⊕ and 8.82 ± 0.94... (More)
Exoplanets transiting bright nearby stars are key objects for advancing our knowledge of planetary formation and evolution. The wealth of photons from the host star gives detailed access to the atmospheric, interior and orbital properties of the planetary companions. ν² Lupi (HD 136352) is a naked-eye (V = 5.78) Sun-like star that was discovered to host three low-mass planets with orbital periods of 11.6, 27.6 and 107.6 d via radial-velocity monitoring. The two inner planets (b and c) were recently found to transit, prompting a photometric follow-up by the brand new Characterising Exoplanets Satellite (CHEOPS). Here, we report that the outer planet d is also transiting, and measure its radius and mass to be 2.56 ± 0.09 R⊕ and 8.82 ± 0.94 M⊕, respectively. With its bright Sun-like star, long period and mild irradiation (~5.7 times the irradiation of Earth), ν² Lupi d unlocks a completely new region in the parameter space of exoplanets amenable to detailed characterization. We refine the properties of all three planets: planet b probably has a rocky mostly dry composition, while planets c and d seem to have retained small hydrogen–helium envelopes and a possibly large water fraction. This diversity of planetary compositions makes the ν² Lupi system an excellent laboratory for testing formation and evolution models of low-mass planets. (Less)
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publication status
published
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in
Nature Astronomy
volume
5
issue
8
pages
13 pages
publisher
Nature Publishing Group
external identifiers
  • scopus:85112680863
ISSN
2397-3366
DOI
10.1038/s41550-021-01381-5
language
English
LU publication?
yes
id
62ed5816-f7e0-4930-9d86-7eda663dd3f9
date added to LUP
2021-09-20 15:32:29
date last changed
2024-04-20 12:33:38
@article{62ed5816-f7e0-4930-9d86-7eda663dd3f9,
  abstract     = {{Exoplanets transiting bright nearby stars are key objects for advancing our knowledge of planetary formation and evolution. The wealth of photons from the host star gives detailed access to the atmospheric, interior and orbital properties of the planetary companions. ν² Lupi (HD 136352) is a naked-eye (V = 5.78) Sun-like star that was discovered to host three low-mass planets with orbital periods of 11.6, 27.6 and 107.6 d via radial-velocity monitoring. The two inner planets (b and c) were recently found to transit, prompting a photometric follow-up by the brand new Characterising Exoplanets Satellite (CHEOPS). Here, we report that the outer planet d is also transiting, and measure its radius and mass to be 2.56 ± 0.09 R⊕ and 8.82 ± 0.94 M⊕, respectively. With its bright Sun-like star, long period and mild irradiation (~5.7 times the irradiation of Earth), ν² Lupi d unlocks a completely new region in the parameter space of exoplanets amenable to detailed characterization. We refine the properties of all three planets: planet b probably has a rocky mostly dry composition, while planets c and d seem to have retained small hydrogen–helium envelopes and a possibly large water fraction. This diversity of planetary compositions makes the ν² Lupi system an excellent laboratory for testing formation and evolution models of low-mass planets.}},
  author       = {{Delrez, L. and Davies, Melvyn B and Walton, Nicholas A.}},
  issn         = {{2397-3366}},
  language     = {{eng}},
  number       = {{8}},
  pages        = {{775--787}},
  publisher    = {{Nature Publishing Group}},
  series       = {{Nature Astronomy}},
  title        = {{Transit detection of the long-period volatile-rich super-Earth ν2 Lupi d with CHEOPS}},
  url          = {{http://dx.doi.org/10.1038/s41550-021-01381-5}},
  doi          = {{10.1038/s41550-021-01381-5}},
  volume       = {{5}},
  year         = {{2021}},
}