Near Infrared Observations of GQ Lup b Using the Gemini Integral Field Spectrograph NIFS

Abstract

We present new JHK spectroscopy (R ~ 5000) of GQ Lup b, acquired with the near-infrared integral field spectrograph NIFS and the adaptive optics system ALTAIR at the Gemini North telescope. Angular differential imaging was used in the J and H bands to suppress the speckle noise from GQ Lup A; we show that this approach can provide improvements in signal-to-noise ratio (S/N) by a factor of 2 - 6 for companions located at subarcsecond separations. Based on high quality observations and GAIA synthetic spectra, we estimate the companion effective temperature to Teff = 2400 +/- 100 K, its gravity to log g = 4.0 +/- 0.5, and its luminosity to log(L/L_s) = -2.47 +/- 0.28. Comparisons with the predictions of the DUSTY evolutionary tracks allow us to constrain the mass of GQ Lup b to 8 - 60 MJup, most likely in the brown dwarf regime. Compared with the spectra published by Seifahrt and collaborators, our spectra of GQ Lup b are significantly redder (by 15 - 50%) and do not show important Paβemission. Our spectra are in excellent agreement with the lower S/N spectra previously published by McElwain and collaborators.

34 pages, 10 figures, accepted for publication in ApJ

References in corpus (19)

• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• Angular Differential Imaging: a Powerful High-Contrast Imaging Technique
• Optical Images of an Exosolar Planet 25 Light Years from Earth
• A probable giant planet imaged in the Beta Pictoris disk
• Accretion in the Rho-Oph pre-main sequence stars
• Direct Imaging and Spectroscopy of a Planetary Mass Candidate Companion to a Young Solar Analog
• A Sample of Very Young Field L Dwarfs and Implications for the Brown Dwarf "Lithium Test" at Early Ages
• Characterizing Young Brown Dwarfs using Low Resolution Near-IR Spectra
• Near-infrared cross-dispersed spectroscopy of brown dwarf candidates in the Upper Sco association
• A Surprising Reversal of Temperatures in the Brown-Dwarf Eclipsing Binary 2MASS J05352184-0546085
• Direct evidence of a sub-stellar companion around CT Cha
• Very high contrast IFU spectroscopy of AB Doradus C: 9 mag contrast at 0.2" without a coronagraph using spectral deconvolution
• Astrometric and photometric monitoring of GQ Lup and its sub-stellar companion
• GQ Lup B Visible & Near-Infrared Photometric Analysis
• First High-Contrast Science with an Integral Field Spectrograph: the Sub-Stellar Companion to GQ Lup
• Near-IR integral-field spectroscopy of the companion to GQ Lup
• Accretion in rho-Ophiuchi brown dwarfs: infrared hydrogen line ratios
• Improving the speckle noise attenuation of simultaneous spectral differential imaging with a focal plane holographic diffuser
• Integral field spectroscopy of L 449-1 -- A test case for spectral differential imaging with SINFONI

Cited by in corpus (23)

• Near-Infrared Spectroscopy of the Extrasolar Planet HR 8799 b
• Can we predict the global magnetic topology of a pre-main sequence star from its position in the Hertzsprung-Russell diagram?
• A library of near-infrared integral field spectra of young M-L dwarfs
• Performance of the VLT Planet Finder SPHERE II. Data analysis and Results for IFS in laboratory
• The Gemini NICI Planet-Finding Campaign : Discovery of a Substellar L Dwarf Companion to the Nearby Young M Dwarf CD-35 2722
• Accretion onto Planetary Mass Companions of Low-Mass Young Stars
• A Disk Around the Planetary-Mass Companion GSC 06214-00210 b: Clues About the Formation of Gas Giants on Wide Orbits
• Magnetometry of the classical T Tauri star GQ Lup: non-stationary dynamos & spin evolution of young Suns
• Spectroscopy across the brown dwarf/planetary mass boundary - I. Near-infrared JHK spectra
• The SEEDS High Contrast Imaging Survey of Exoplanets around Young Stellar Objects
• A medium-resolution spectrum of the exoplanet HIP 65426 b
• Measuring the ratio of the gas and dust emission radii of protoplanetary disks in the Lupus star-forming region
• ALMA Measurements of Circumstellar Material in the GQ Lup System
• A treatment procedure for Gemini North/NIFS data cubes: application to NGC 4151
• New constraints on the formation and settling of dust in the atmospheres of young M and L dwarfs
• An ALMA and MagAO Study of the Substellar Companion GQ Lup B
• The ESO SupJup Survey I: Chemical and isotopic characterisation of the late L-dwarf DENIS J0255-4700 with CRIRES${}^{+}$
• The Young Substellar Companion ROXs 12 B: Near-Infrared Spectrum, System Architecture, and Spin-Orbit Misalignment
• Emission line variability of young 10-30 Mjup companions : I. The case of GQ Lup b and GSC 06214-00210 b
• Characterizing the protolunar disk of the accreting companion GQ Lupi B
• Detection of Paschen $\beta$ absorption in the atmosphere of KELT-9 b: A new window into the atmospheres of ultra-hot Jupiters
• Measuring titanium isotope ratios in exoplanet atmospheres
• Exoplanet Atmosphere Measurements from Direct Imaging