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37 new validated planets in overlapping K2 campaigns

de Leon, J. P. ; Livingston, J. ; Endl, M. ; Cochran, W. D. ; Hirano, T. ; García, R. A. ; Mathur, S. ; Lam, K. W.F. ; Korth, J. LU and Trani, A. A. , et al. (2021) In Monthly Notices of the Royal Astronomical Society 508(1). p.195-218
Abstract

We analysed 68 candidate planetary systems first identified during Campaigns 5 and 6 (C5 and C6) of the NASA K2 mission. We set out to validate these systems by using a suite of follow-up observations, including adaptive optics, speckle imaging, and reconnaissance spectroscopy. The overlap between C5 with C16 and C18, and C6 with C17, yields light curves with long baselines that allow us to measure the transit ephemeris very precisely, revisit single transit candidates identified in earlier campaigns, and search for additional transiting planets with longer periods not detectable in previous works. Using VESPA, we compute false positive probabilities of less than 1 per cent for 37 candidates orbiting 29 unique host stars and hence... (More)

We analysed 68 candidate planetary systems first identified during Campaigns 5 and 6 (C5 and C6) of the NASA K2 mission. We set out to validate these systems by using a suite of follow-up observations, including adaptive optics, speckle imaging, and reconnaissance spectroscopy. The overlap between C5 with C16 and C18, and C6 with C17, yields light curves with long baselines that allow us to measure the transit ephemeris very precisely, revisit single transit candidates identified in earlier campaigns, and search for additional transiting planets with longer periods not detectable in previous works. Using VESPA, we compute false positive probabilities of less than 1 per cent for 37 candidates orbiting 29 unique host stars and hence statistically validate them as planets. These planets have a typical size of 2.2 R and orbital periods between 1.99 and 52.71 d. We highlight interesting systems including a sub-Neptune with the longest period detected by K2, sub-Saturns around F stars, several multiplanetary systems in a variety of architectures. These results show that a wealth of planetary systems still remains in the K2 data, some of which can be validated using minimal follow-up observations and taking advantage of analyses presented in previous catalogues.

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publishing date
type
Contribution to journal
publication status
published
keywords
Exoplanets, Methods: data analysis, Planets and satellites: detection, Stars: fundamental parameters, Techniques: photometric
in
Monthly Notices of the Royal Astronomical Society
volume
508
issue
1
pages
24 pages
publisher
Oxford University Press
external identifiers
  • scopus:85117093527
ISSN
0035-8711
DOI
10.1093/mnras/stab2305
language
English
LU publication?
no
additional info
Publisher Copyright: © 2021 The Author(s).
id
ce4990a9-cf39-41c6-a3f6-64c42e3751b2
date added to LUP
2023-02-01 09:57:13
date last changed
2023-02-20 16:29:54
@article{ce4990a9-cf39-41c6-a3f6-64c42e3751b2,
  abstract     = {{<p>We analysed 68 candidate planetary systems first identified during Campaigns 5 and 6 (C5 and C6) of the NASA K2 mission. We set out to validate these systems by using a suite of follow-up observations, including adaptive optics, speckle imaging, and reconnaissance spectroscopy. The overlap between C5 with C16 and C18, and C6 with C17, yields light curves with long baselines that allow us to measure the transit ephemeris very precisely, revisit single transit candidates identified in earlier campaigns, and search for additional transiting planets with longer periods not detectable in previous works. Using VESPA, we compute false positive probabilities of less than 1 per cent for 37 candidates orbiting 29 unique host stars and hence statistically validate them as planets. These planets have a typical size of 2.2 R and orbital periods between 1.99 and 52.71 d. We highlight interesting systems including a sub-Neptune with the longest period detected by K2, sub-Saturns around F stars, several multiplanetary systems in a variety of architectures. These results show that a wealth of planetary systems still remains in the K2 data, some of which can be validated using minimal follow-up observations and taking advantage of analyses presented in previous catalogues.</p>}},
  author       = {{de Leon, J. P. and Livingston, J. and Endl, M. and Cochran, W. D. and Hirano, T. and García, R. A. and Mathur, S. and Lam, K. W.F. and Korth, J. and Trani, A. A. and Dai, F. and Díez Alonso, E. and Castro-González, A. and Fridlund, M. and Fukui, A. and Gandolfi, D. and Kabath, P. and Kuzuhara, M. and Luque, R. and Savel, A. B. and Gill, H. and Dressing, C. and Giacalone, S. and Narita, N. and Palle, E. and van Eylen, V. and Tamura, M.}},
  issn         = {{0035-8711}},
  keywords     = {{Exoplanets; Methods: data analysis; Planets and satellites: detection; Stars: fundamental parameters; Techniques: photometric}},
  language     = {{eng}},
  month        = {{11}},
  number       = {{1}},
  pages        = {{195--218}},
  publisher    = {{Oxford University Press}},
  series       = {{Monthly Notices of the Royal Astronomical Society}},
  title        = {{37 new validated planets in overlapping K2 campaigns}},
  url          = {{http://dx.doi.org/10.1093/mnras/stab2305}},
  doi          = {{10.1093/mnras/stab2305}},
  volume       = {{508}},
  year         = {{2021}},
}