2012ApJ...760L..32C -
Astrophys. J., 760, L32 (2012/December-1)
Direct imaging confirmation and characterization of a dust-enshrouded candidate exoplanet orbiting Fomalhaut.
CURRIE T., DEBES J., RODIGAS T.J., BURROWS A., ITOH Y., FUKAGAWA M., KENYON S.J., KUCHNER M. and MATSUMURA S.
Abstract (from CDS):
We present Subaru/IRCS J-band data for Fomalhaut and a (re)reduction of archival 2004-2006 HST/ACS data first presented by Kalas et al. We confirm the existence of a candidate exoplanet, Fomalhaut b, in both the 2004 and 2006 F606W data sets at a high signal-to-noise ratio. Additionally, we confirm the detection at F814W and present a new detection in F435W. Fomalhaut b's space motion may be consistent with it being in an apsidally aligned, non-debris ring-crossing orbit, although new astrometry is required for firmer conclusions. We cannot confirm that Fomalhaut b exhibits 0.7-0.8 mag variability cited as evidence for planet accretion or a semi-transient dust cloud. The new, combined optical spectral energy distribution and IR upper limits confirm that emission identifying Fomalhaut b originates from starlight scattered by small dust, but this dust is most likely associated with a massive body. The Subaru and IRAC/4.5 µm upper limits imply M < 2 MJ, still consistent with the range of Fomalhaut b masses needed to sculpt the disk. Fomalhaut b is very plausibly "a planet identified from direct imaging" even if current images of it do not, strictly speaking, show thermal emission from a directly imaged planet.
Abstract Copyright:
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Journal keyword(s):
planetary systems - stars: individual: Fomalhaut
Simbad objects:
4
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