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Cited by 921Stellar, planetary, and galactic studiesAstronomy and Astrophysical ResearchAstro and Planetary Science

Models of very-low-mass stars, brown dwarfs and exoplanets

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Allard, F., Homeier, D., Freytag, B.·2012·Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
DOI 10.1098/rsta.2011.0269PMC PMC3350648
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Abstract

Within the next few years, GAIA and several instruments aiming to image extrasolar planets will be ready. In parallel, low-mass planets are being sought around red dwarfs, which offer more favourable conditions, for both radial velocity detection and transit studies, than solar-type stars. In this paper, the authors of a model atmosphere code that has allowed the detection of water vapour in the atmosphere of hot Jupiters review recent advances in modelling the stellar to substellar transition. The revised solar oxygen abundances and cloud model allow the photometric and spectroscopic properties of this transition to be reproduced for the first time. Also presented are highlight results of a model atmosphere grid for stars, brown dwarfs and extrasolar planets.

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  • Direct imaging limits constrain a free-floating object like J1407b to be 8 M_Jup, assuming an age of 16 Myr and BT-SETTL models.

    “Direct imaging limits reported in Kenworthy et al. (2015) constrain such a free-floating object to be 8 M Jup , assuming an age of 16 Myr and BT-SETTL models (Allard et al. 2012).”

    From MODELING GIANT EXTRASOLAR RING SYSTEMS IN ECLIPSE AND THE CASE OF J1407B: SCULPTING BY EXOMOONS? (2015) · cites this paper as Allard et al. 2012

  • VLT SAM mass limits reach below 13 M_Jup in several regions around J1407, rising to 20 M_Jup for radii of 28 mas (3 AU) and smaller.

    “It can be seen that masses below 13 M Jup are reached in several regions around J1407, rising to 20 M Jup for radii of 28 mas (3 AU) and smaller.”

    From Mass and period limits on the ringed companion transiting the young star J1407 (2015) · cites this paper as Allard et al. 2012

    The Applications to exoplanet science section discusses model atmospheres and mentions instruments at the VLT, but gives no observations of J1407 or VLT SAM mass limits. Searches for J1407, 28 mas, and sparse-aperture masking found no passage supporting the stated 13- and 20-M_Jup limits. (LLM, conf=0.76)

    Experimental — accuracy not yet measured

  • Keck direct imaging limits reach down to 8 M_Jup at large radii, rising to 18 M_Jup at 26 au.

    “The direct imaging limits at large radii reach down to 8 M Jup , rising to 18 M Jup at 26 au.”

    From Mass and period limits on the ringed companion transiting the young star J1407 (2015) · cites this paper as Allard et al. 2012

    The Applications to exoplanet science section discusses direct-imaging instruments and planets at distances of several dozen AU, but gives no Keck detection limits. Searches for Keck, 8 and 18 Jupiter masses, and 26 AU found no passage supporting the stated limits; page numbers are unavailable in our copy. (LLM, conf=0.72)

    Experimental — accuracy not yet measured

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Authors
Allard, F., Homeier, D., & Freytag, B.
Affiliations
École Normale Supérieure de Lyon (FR)
Corresponding author
Allard, F.
ORCID
Venue
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Publisher
The Royal Society
Published
2012-06-13
Volume
370
Issue
1968
Pages
2765-2777
ISSN
  • 1364-503X (ISSN-L)
  • 1471-2962
DOI
10.1098/rsta.2011.0269
PMC
PMC3350648
OpenAlex
W2133636837
Cited by
921
References
68
Citations by year
2026: 45 · 2025: 79 · 2024: 62 · 2023: 66 · 2022: 77 · 2021: 55 · 2020: 91 · 2019: 101 · 2018: 78 · 2017: 67 · 2016: 50 · 2015: 63 · 2014: 44 · 2013: 29 · 2012: 14
FWCI
26.44
Type
journal article
Language
en
Open access
Licence
Locations
  • Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • HAL (submittedVersion)
  • arXiv (Cornell University)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
  • Physical Sciences › Physics and Astronomy › Instrumentation › Astronomy and Astrophysical Research
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
Keywords
very low mass stars, brown dwarfs, exoplanets, model atmospheres, cloud model, solar oxygen abundance, transit photometry, stellar atmospheres

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