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A new dynamical modeling of the WASP-47 system with CHEOPS observations

Nascimbeni, V. ; Borsato, L. ; Zingales, T. ; Piotto, G. ; Pagano, I. ; Beck, M. ; Broeg, C. ; Ehrenreich, D. ; Hoyer, S. and Majidi, F.~Z. , et al. (2023) In Astronomy & Astrophysics 673.
Abstract
Among the hundreds of known hot Jupiters (HJs), only five have been found to have companions on short-period orbits. Within this rare class of multiple planetary systems, the architecture of WASP-47 is unique, hosting an HJ (planet-b) with both an inner and an outer sub-Neptunian mass companion (-e and -d, respectively) as well as an additional non-transiting, long-period giant (-c). The small period ratio between planets -b and -d boosts the transit time variation (TTV) signal, making it possible to reliably measure the masses of these planets in synergy with the radial velocity (RV) technique. In this paper, we present new space- and ground-based photometric data of WASP-47b and WASP-47-d, including 11 unpublished light curves from the... (More)
Among the hundreds of known hot Jupiters (HJs), only five have been found to have companions on short-period orbits. Within this rare class of multiple planetary systems, the architecture of WASP-47 is unique, hosting an HJ (planet-b) with both an inner and an outer sub-Neptunian mass companion (-e and -d, respectively) as well as an additional non-transiting, long-period giant (-c). The small period ratio between planets -b and -d boosts the transit time variation (TTV) signal, making it possible to reliably measure the masses of these planets in synergy with the radial velocity (RV) technique. In this paper, we present new space- and ground-based photometric data of WASP-47b and WASP-47-d, including 11 unpublished light curves from the ESA mission CHaracterising ExOPlanet Satellite (CHEOPS). We analyzed the light curves in a homogeneous way together with all the publicly available data to carry out a global N-body dynamical modeling of the TTV and RV signals. We retrieved, among other parameters, a mass and density for planet -d of Md = 15.5 ± 0.8 M⊕ and ρd = 1.69 ± 0.22 g cm−3, which is in good agreement with the literature and consistent with a Neptune-like composition. For the inner planet (-e), we found a mass and density of Me = 9.0 ± 0.5 M⊕ and ρe = 8.1 ± 0.5 g cm−3, suggesting an Earth-like composition close to other ultra-hot planets at similar irradiation levels. Though this result is in agreement with previous RV plus TTV studies, it is not in agreement with the most recent RV analysis (at 2.8σ), which yielded a lower density compatible with a pure silicate composition. This discrepancy highlights the still unresolved issue of suspected systematic offsets between RV and TTV measurements. In this paper, we also significantly improve the orbital ephemerides of all transiting planets, which will be crucial for any future follow-up. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
techniques: photometric, planets and satellites: detection, planets and satellites: general, Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics
in
Astronomy & Astrophysics
volume
673
article number
A42
publisher
EDP Sciences
external identifiers
  • scopus:85159559703
ISSN
1432-0746
DOI
10.1051/0004-6361/202245486
project
Consolidating CHEOPS and preparing for PLATO: Exoplanet studies in the 2020s
language
English
LU publication?
yes
id
cb3f8ee1-9cf9-4eaa-8f97-563613da6395
date added to LUP
2023-08-18 12:17:44
date last changed
2024-04-20 01:02:02
@article{cb3f8ee1-9cf9-4eaa-8f97-563613da6395,
  abstract     = {{Among the hundreds of known hot Jupiters (HJs), only five have been found to have companions on short-period orbits. Within this rare class of multiple planetary systems, the architecture of WASP-47 is unique, hosting an HJ (planet-b) with both an inner and an outer sub-Neptunian mass companion (-e and -d, respectively) as well as an additional non-transiting, long-period giant (-c). The small period ratio between planets -b and -d boosts the transit time variation (TTV) signal, making it possible to reliably measure the masses of these planets in synergy with the radial velocity (RV) technique. In this paper, we present new space- and ground-based photometric data of WASP-47b and WASP-47-d, including 11 unpublished light curves from the ESA mission CHaracterising ExOPlanet Satellite (CHEOPS). We analyzed the light curves in a homogeneous way together with all the publicly available data to carry out a global N-body dynamical modeling of the TTV and RV signals. We retrieved, among other parameters, a mass and density for planet -d of Md = 15.5 ± 0.8 M⊕ and ρd = 1.69 ± 0.22 g cm−3, which is in good agreement with the literature and consistent with a Neptune-like composition. For the inner planet (-e), we found a mass and density of Me = 9.0 ± 0.5 M⊕ and ρe = 8.1 ± 0.5 g cm−3, suggesting an Earth-like composition close to other ultra-hot planets at similar irradiation levels. Though this result is in agreement with previous RV plus TTV studies, it is not in agreement with the most recent RV analysis (at 2.8σ), which yielded a lower density compatible with a pure silicate composition. This discrepancy highlights the still unresolved issue of suspected systematic offsets between RV and TTV measurements. In this paper, we also significantly improve the orbital ephemerides of all transiting planets, which will be crucial for any future follow-up.}},
  author       = {{Nascimbeni, V. and Borsato, L. and Zingales, T. and Piotto, G. and Pagano, I. and Beck, M. and Broeg, C. and Ehrenreich, D. and Hoyer, S. and Majidi, F.~Z. and Granata, V. and Sousa, S.~G. and Wilson, T.~G. and Van Grootel, V. and Bonfanti, A. and Salmon, S. and Mustill, A.~J. and Delrez, L. and Alibert, Y. and Alonso, R. and Anglada, G. and Bárczy, T. and Barrado, D. and Barros, S.~C.~C. and Baumjohann, W. and Beck, T. and Benz, W. and Bergomi, M. and Billot, N. and Bonfils, X. and Brandeker, A. and Cabrera, J. and Charnoz, S. and Collier Cameron, A. and Csizmadia, Sz. and Cubillos, P.~E. and Davies, M.~B. and Deleuil, M. and Deline, A. and Demangeon, O.~D.~S. and Demory, B. -O. and Erikson, A. and Fortier, A. and Fossati, L. and Fridlund, M. and Gandolfi, D. and Gillon, M. and Güdel, M. and Isaak, K.~G. and Kiss, L.~L. and Laskar, J. and Lecavelier des Etangs, A. and Lendl, M. and Lovis, C. and Luque, R. and Magrin, D. and Maxted, P.~F.~L. and Mordasini, C. and Olofsson, G. and Ottensamer, R. and Pallé, E. and Peter, G. and Piazza, D. and Pollacco, D. and Queloz, D. and Ragazzoni, R. and Rando, N. and Ratti, F. and Rauer, H. and Ribas, I. and Santos, N.~C. and Scandariato, G. and Ségransan, D. and Simon, A.~E. and Smith, A.~M.~S. and Steinberger, M. and Steller, M. and Szabó, Gy. M. and Thomas, N. and Udry, S. and Venturini, J. and Walton, N.~A. and Wolter, D.}},
  issn         = {{1432-0746}},
  keywords     = {{techniques: photometric; planets and satellites: detection; planets and satellites: general; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics}},
  language     = {{eng}},
  month        = {{05}},
  publisher    = {{EDP Sciences}},
  series       = {{Astronomy & Astrophysics}},
  title        = {{A new dynamical modeling of the WASP-47 system with CHEOPS observations}},
  url          = {{http://dx.doi.org/10.1051/0004-6361/202245486}},
  doi          = {{10.1051/0004-6361/202245486}},
  volume       = {{673}},
  year         = {{2023}},
}