First High-Contrast Science with an IFU: The Sub-Stellar Companion to GQ Lup

Details First High-Contrast Science with an IFU: The Sub-Stellar Companion to GQ Lup First High-Contrast Science with an IFU: The Sub-Stellar Companion to GQ Lup

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20919605m&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #196.05; Bulletin of the American Astronomical Society,

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Scientific paper

We present high-contrast integral field spectroscopy with Keck AO+OSIRIS of the young star GQ Lup and its close-in sub-stellar companion claimed to be the first, and only, planet directly imaged around a hydrogen-burning star. By allowing simultaneous two-dimensional sampling of the bright halo of the primary, OSIRIS enables us to accurately estimate the host-star contamination in the spectrum of the sub-stellar companion an otherwise challenging task for conventional AO slit spectroscopy in the constrast-limited regime. Our R=2000 Jand H-band spectra of GQ Lup B complement existing K-band spectra and photometry, and improve on the original estimate of its spectral type.
We find that GQ Lup B is somewhat hotter (M6-L0) than reported in the discovery paper by Neuhauser and collaborators (M9-L4), mainly due to the surface-gravity sensitivity of the K-band spectral classification indices used by the discoverers. Using our updated spectroscopic classification of GQ Lup B and a re-evaluation of the age and heliocentric distance of the primary, we perform a comparative analysis of the available sub-stellar evolutionary models to estimate the mass of the companion. We find that the mass of GQ Lup B is 0.010-0.040 solar masses. Hence, it is unlikely to be a wide-orbit counterpart to the known radial-velocity extrasolar planets, whose masses are <=0.015 solar masses. Instead, GQ Lup A/B is a member of a growing family of very low mass ratio widely separated binaries discovered through high-contrast imaging.

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