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Atmospheric Charact...
Atmospheric Characterization and Further Orbital Modeling of kappa Andromeda b
- Article/chapterEnglish2020
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2020-01-07
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American Astronomical Society,2020
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LIBRIS-ID:oai:DiVA.org:su-178795
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-178795URI
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https://doi.org/10.3847/1538-3881/ab5afaDOI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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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.
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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, RubenStockholms universitet,Institutionen för astronomi(Swepub:su)rasen
(author)
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Janson, MarkusStockholms universitet,Institutionen för astronomi(Swepub:su)mjanso
(author)
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Knapp, Gillian R.
(author)
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Serabyn, Eugene
(author)
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Stockholms universitetInstitutionen för astronomi
(creator_code:org_t)
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In:Astronomical Journal: American Astronomical Society159:20004-62561538-3881
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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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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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NATURAL SCIENCES
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Stockholm University