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

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

2009-08-26

arxiv.org/abs/0908.3723v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

34 pages, 10 figures, accepted for publication in ApJ

Scientific paper

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 Pa\beta emission. Our spectra are in excellent agreement with the lower S/N spectra previously published by McElwain and collaborators.

Affiliated with

Also associated with

No associations

Rating

Near Infrared Observations of GQ Lup b Using the Gemini Integral Field Spectrograph NIFS does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Near Infrared Observations of GQ Lup b Using the Gemini Integral Field Spectrograph NIFS, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Near Infrared Observations of GQ Lup b Using the Gemini Integral Field Spectrograph NIFS will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-623715