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Mid-infrared characterization of the planetary-mass companion ROXs 42B b

Author(s): Daemgen, Sebastian; Todorov, Kamen; Silva, Jasmin; Hand, Derek; Garcia, Eugenio V; et al

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dc.contributor.authorDaemgen, Sebastian-
dc.contributor.authorTodorov, Kamen-
dc.contributor.authorSilva, Jasmin-
dc.contributor.authorHand, Derek-
dc.contributor.authorGarcia, Eugenio V-
dc.contributor.authorCurrie, Thayne-
dc.contributor.authorBurrows, Adam S-
dc.contributor.authorStassun, Keivan G-
dc.contributor.authorRatzka, Thorsten-
dc.contributor.authorDebes, John H-
dc.contributor.authorLafreniere, David-
dc.contributor.authorJayawardhana, Ray-
dc.contributor.authorCorreia, Serge-
dc.date.accessioned2019-04-10T19:30:57Z-
dc.date.available2019-04-10T19:30:57Z-
dc.date.issued2017-05en_US
dc.identifier.citationDaemgen, Sebastian, Todorov, Kamen, Silva, Jasmin, Hand, Derek, Garcia, Eugenio V, Currie, Thayne, Burrows, Adam, Stassun, Keivan G, Ratzka, Thorsten, Debes, John H, Lafreniere, David, Jayawardhana, Ray, Correia, Serge. (2017). Mid-infrared characterization of the planetary-mass companion ROXs 42B b. åp, 601 (A65 - A65. doi:10.1051/0004-6361/201629949en_US
dc.identifier.urihttp://arks.princeton.edu/ark:/88435/pr1z10r-
dc.description.abstractWe present new Keck/NIRC2 3–5μm infrared photometry of the planetary-mass companion to ROXS 42B inL′, and for the first timein Brackett-α(Brα) and inMs-band. We combine our data with existing near-infrared photometry andK-band (2–2.4μm) spectroscopyand compare these data with models and other directly imaged planetary-mass objects using forward modeling and retrieval methods inorder to characterize the atmosphere of ROXS 42B b. The ROXS 42B b 1.25–5μm spectral energy distribution most closely resemblesthat of GSC 06214 B andκAnd b, although it has a slightly bluerKs−Mscolor than GSC 06214 B and thus currently lacks evidence of acircumplanetary disk. We cannot formally exclude the possibility that any of the tested dust-free/dusty/cloudy forward models describethe atmosphere of ROXS 42B b well. However, models with substantial atmospheric dust/clouds yield temperatures and gravities thatare consistent when fit to photometry and spectra separately, whereas dust-free model fits to photometry predict temperatures/gravitiesinconsistent with the ROXS 42B bK-band spectrum and vice-versa. Atmospheric retrieval on the 1–5μm photometry places a limiton the fractional number density of CO2of log(nCO2)<−2.7, but provides no other constraints so far. We conclude that ROXS 42B bhas mid-IR photometric features that are systematically different from other previously observed planetary-mass and field objects ofsimilar temperature. It remains unclear whether this is in the range of the natural diversity of targets at the very young (∼2 Myr) ageof ROXS 42B b or unique to its early evolution and environment.en_US
dc.language.isoen_USen_US
dc.relation.ispartofAstronomy & Astrophysicsen_US
dc.rightsAuthor's manuscripten_US
dc.titleMid-infrared characterization of the planetary-mass companion ROXs 42B ben_US
dc.typeJournal Articleen_US
dc.identifier.doidoi:10.1051/0004-6361/201629949-
dc.date.eissued2017-05-03en_US
pu.type.symplectichttp://www.symplectic.co.uk/publications/atom-terms/1.0/journal-articleen_US

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