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Atmospheric Charact...
Atmospheric Characterization and Further Orbital Modeling of kappa Andromeda b
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Uyama, Taichi (author)
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Currie, Thayne (author)
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Hori, Yasunori (author)
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De Rosa, Robert J. (author)
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Mede, Kyle (author)
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Brandt, Timothy D. (author)
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Kwon, Jungmi (author)
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Guyon, Olivier (author)
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Lozi, Julien (author)
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Jovanovic, Nemanja (author)
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Martinache, Frantz (author)
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Kudo, Tomoyuki (author)
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Tamura, Motohide (author)
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Kasdin, N. Jeremy (author)
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Groff, Tyler (author)
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Chilcote, Jeffrey (author)
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Hayashi, Masahiko (author)
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McElwain, Michael W. (author)
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- Asensio-Torres, Ruben (author)
- Stockholms universitet,Institutionen för astronomi
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- Janson, Markus (author)
- Stockholms universitet,Institutionen för astronomi
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Knapp, Gillian R. (author)
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Serabyn, Eugene (author)
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(creator_code:org_t)
- 2020-01-07
- 2020
- English.
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In: Astronomical Journal. - : American Astronomical Society. - 0004-6256 .- 1538-3881. ; 159:2
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https://iopscience.i...
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https://urn.kb.se/re...
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https://doi.org/10.3...
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Abstract
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- We present kappa Andromeda b's photometry and astrometry taken with Subaru/SCExAO+HiCIAO and Keck/NIRC2, combined with recently published SCExAO/CHARIS low-resolution spectroscopy and published thermal infrared photometry to further constrain the companion's atmospheric properties and orbit. The Y/Y-K colors of kappa And b are redder than field dwarfs, consistent with its youth and lower gravity. Empirical comparisons of its Y-band photometry and CHARIS spectrum to a large spectral library of isolated field dwarfs reaffirm the conclusion from Currie et al. that it likely has a low gravity but admit a wider range of most plausible spectral types (L0-L2). Our gravitational classification also suggests that the best-fit objects for kappa And b may have lower gravity than those previously reported. Atmospheric models lacking dust/clouds fail to reproduce its entire 1-4.7 mu m spectral energy distribution (SED), and cloudy atmosphere models with temperatures of similar to 1700-2000 K better match kappa And b data. Most well-fitting model comparisons favor 1700-1900 K, a surface gravity of log(g) similar to 4-4.5, and a radius of 1.3-1.6 R-Jup; the best-fit model (Drift-Phoenix) yields the coolest and lowest-gravity values: T-eff = 1700 K and log g = 4.0. An update to kappa And b's orbit with ExoSOFT using new astrometry spanning 7 yr reaffirms its high eccentricity (0.77 0.08). We consider a scenario where unseen companions are responsible for scattering kappa And b to a wide separation and high eccentricity. If three planets, including kappa And b, were born with coplanar orbits, and one of them was ejected by gravitational scattering, a potential inner companion with mass greater than or similar to 10 M-Jup could be located at less than or similar to 25 au.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Exoplanet astronomy
- Exoplanet evolution
- Exoplanet atmospheres
- Exoplanet formation
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Uyama, Taichi
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Currie, Thayne
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Hori, Yasunori
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De Rosa, Robert ...
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Mede, Kyle
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Brandt, Timothy ...
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show more...
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Kwon, Jungmi
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Guyon, Olivier
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Lozi, Julien
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Jovanovic, Neman ...
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Martinache, Fran ...
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Kudo, Tomoyuki
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Tamura, Motohide
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Kasdin, N. Jerem ...
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Groff, Tyler
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Chilcote, Jeffre ...
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Hayashi, Masahik ...
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McElwain, Michae ...
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Asensio-Torres, ...
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Janson, Markus
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Knapp, Gillian R ...
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Serabyn, Eugene
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show less...
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Stockholm University