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Discovery of TOI-1260d and the characterization of the multiplanet system

Lam, K.W.F. ; Davies, M.B. LU and Winn, J.N. (2023) In Monthly Notices of the Royal Astronomical Society 519(1). p.1437-1451
Abstract
We report the discovery of a third planet transiting the star TOI-1260, previously known to host two transiting sub-Neptune planets with orbital periods of 3.127 and 7.493 d, respectively. The nature of the third transiting planet with a 16.6-d orbit is supported by ground-based follow-up observations, including time-series photometry, high-angular resolution images, spectroscopy, and archival imagery. Precise photometric monitoring with CHEOPS allows to improve the constraints on the parameters of the system, improving our knowledge on their composition. The improved radii of TOI-1260b and TOI-1260c are 2.36 ± 0.06 R⊕, 2.82 ± 0.08 R⊕ , respectively while the newly discovered third planet has a radius of 3.09 ± 0.09 R⊕. The radius... (More)
We report the discovery of a third planet transiting the star TOI-1260, previously known to host two transiting sub-Neptune planets with orbital periods of 3.127 and 7.493 d, respectively. The nature of the third transiting planet with a 16.6-d orbit is supported by ground-based follow-up observations, including time-series photometry, high-angular resolution images, spectroscopy, and archival imagery. Precise photometric monitoring with CHEOPS allows to improve the constraints on the parameters of the system, improving our knowledge on their composition. The improved radii of TOI-1260b and TOI-1260c are 2.36 ± 0.06 R⊕, 2.82 ± 0.08 R⊕ , respectively while the newly discovered third planet has a radius of 3.09 ± 0.09 R⊕. The radius uncertainties are in the range of 3 per cent, allowing a precise interpretation of the interior structure of the three planets. Our planet interior composition model suggests that all three planets in the TOI-1260 system contains some fraction of gas. The innermost planet TOI-1260b has most likely lost all of its primordial hydrogen-dominated envelope. Planets c and d were also likely to have experienced significant loss of atmospheric through escape, but to a lesser extent compared to planet b. © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. (Less)
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keywords
c, d, planets and satellites: composition, planets and satellites: detection, planets and satellites: individual: TOI-1260b, stars: individual: TOI-1260, Techniques: photometric, techniques: radial velocities, Interplanetary flight, Orbits, Photometry, Satellites, Stars, C, D, Planet and satellite: individual: TOI-1260b, Planets and satellites: compositions, Planets and satellites: detections, Planets and satellites: individual, Star: individual: TOI-1260, Stars: individual: proxima Centauri, Techniques: radial velocities, Planets
in
Monthly Notices of the Royal Astronomical Society
volume
519
issue
1
pages
15 pages
publisher
Oxford University Press
external identifiers
  • scopus:85159271747
ISSN
0035-8711
DOI
10.1093/mnras/stac3639
language
English
LU publication?
yes
id
261fb0fc-4a36-4aad-920d-bc58a5b22bfa
date added to LUP
2023-11-09 12:05:47
date last changed
2023-11-09 12:06:29
@article{261fb0fc-4a36-4aad-920d-bc58a5b22bfa,
  abstract     = {{We report the discovery of a third planet transiting the star TOI-1260, previously known to host two transiting sub-Neptune planets with orbital periods of 3.127 and 7.493 d, respectively. The nature of the third transiting planet with a 16.6-d orbit is supported by ground-based follow-up observations, including time-series photometry, high-angular resolution images, spectroscopy, and archival imagery. Precise photometric monitoring with CHEOPS allows to improve the constraints on the parameters of the system, improving our knowledge on their composition. The improved radii of TOI-1260b and TOI-1260c are 2.36 ± 0.06 R⊕, 2.82 ± 0.08 R⊕ , respectively while the newly discovered third planet has a radius of 3.09 ± 0.09 R⊕. The radius uncertainties are in the range of 3 per cent, allowing a precise interpretation of the interior structure of the three planets. Our planet interior composition model suggests that all three planets in the TOI-1260 system contains some fraction of gas. The innermost planet TOI-1260b has most likely lost all of its primordial hydrogen-dominated envelope. Planets c and d were also likely to have experienced significant loss of atmospheric through escape, but to a lesser extent compared to planet b. © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.}},
  author       = {{Lam, K.W.F. and Davies, M.B. and Winn, J.N.}},
  issn         = {{0035-8711}},
  keywords     = {{c; d; planets and satellites: composition; planets and satellites: detection; planets and satellites: individual: TOI-1260b; stars: individual: TOI-1260; Techniques: photometric; techniques: radial velocities; Interplanetary flight; Orbits; Photometry; Satellites; Stars; C; D; Planet and satellite: individual: TOI-1260b; Planets and satellites: compositions; Planets and satellites: detections; Planets and satellites: individual; Star: individual: TOI-1260; Stars: individual: proxima Centauri; Techniques: radial velocities; Planets}},
  language     = {{eng}},
  number       = {{1}},
  pages        = {{1437--1451}},
  publisher    = {{Oxford University Press}},
  series       = {{Monthly Notices of the Royal Astronomical Society}},
  title        = {{Discovery of TOI-1260d and the characterization of the multiplanet system}},
  url          = {{http://dx.doi.org/10.1093/mnras/stac3639}},
  doi          = {{10.1093/mnras/stac3639}},
  volume       = {{519}},
  year         = {{2023}},
}