1–2.4 μm near-IR spectrum of the giant planet β Pictoris b obtained with the gemini planet imager

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DOIResolve DOI: http://doi.org/10.3847/1538-3881/aa63e9
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TypeArticle
Journal titleThe Astronomical Journal
ISSN0004-6256
1538-3881
Volume153
Issue4
Pages# of pages: 15
AbstractUsing the Gemini Planet Imager located at Gemini South, we measured the near-infrared (1.0–2.4 μm) spectrum of the planetary companion to the nearby, young star β Pictoris. We compare the spectrum obtained with currently published model grids and with known substellar objects and present the best matching models as well as the best matching observed objects. Comparing the empirical measurement of the bolometric luminosity to evolutionary models, we find a mass of 12.9 ± 0.2 MJup, an effective temperature of 1724 ± 15 K, a radius of 1.46 ± 0.01 RJup, and a surface gravity of logg=4.18\pm 0.01 [dex] (cgs). The stated uncertainties are statistical errors only, and do not incorporate any uncertainty on the evolutionary models. Using atmospheric models, we find an effective temperature of 1700–1800 K and a surface gravity of logg=3.5$–4.0 [dex] depending upon the model. These values agree well with other publications and with "hot-start" predictions from planetary evolution models. Further, we find that the spectrum of β Pic b best matches a low surface gravity L2 ± 1 brown dwarf. Finally, comparing the spectrum to field brown dwarfs, we find the the spectrum best matches 2MASS J04062677–381210 and 2MASS J03552337+1133437.
Publication date
PublisherAmerican Astronomical Society
LanguageEnglish
AffiliationNational Research Council Canada; NRC Herzberg Astronomy and Astrophysics
Peer reviewedYes
NPARC number23002247
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Record identifier853a38d3-0f5a-4c41-b648-b1b48eed867b
Record created2017-09-14
Record modified2017-09-14
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