M-band Imaging of the HR 8799 Planetary System Using an Innovative LOCI-based Background Subtraction Technique

Details M-band Imaging of the HR 8799 Planetary System Using an Innovative LOCI-based Background Subtraction Technique M-band Imaging of the HR 8799 Planetary System Using an Innovative LOCI-based Background Subtraction Technique

2011-07-05

arxiv.org/abs/1107.0967v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

10 pages, 4 figures, 1 table, accepted in ApJL

Scientific paper

Multi-wavelength observations/spectroscopy of exoplanetary atmospheres are the basis of the emerging exciting field of comparative exoplanetology. The HR 8799 planetary system is an ideal laboratory to study our current knowledge gap between massive field brown dwarfs and the cold 5-Gyr old Solar system planets. The HR 8799 planets have so far been imaged at J- to L-band, with only upper limits available at M-band. We present here deep high-contrast Keck II adaptive optics M-band observations that show the imaging detection of 3 of the 4 currently known HR 8799 planets. Such detections were made possible due to the development of an innovative LOCI-based background subtraction scheme that is 3 times more efficient than a classical median background subtraction for Keck II AO data, representing a gain in telescope time of up to a factor of 9. These M-band detections extend the broad band photometric coverage out to about 5 microns and provide access to the strong CO fundamental absorption band at 4.5microns. The new M-band photometry shows that the HR 8799 planets are located near the L/T-type dwarf transition, similar to what was found by other studies. We also confirm that the best atmospheric fits are consistent with low surface gravity, dusty and non-equilibrium CO/CH4 chemistry models.

Affiliated with

Also associated with

No associations

Rating

M-band Imaging of the HR 8799 Planetary System Using an Innovative LOCI-based Background Subtraction Technique 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 M-band Imaging of the HR 8799 Planetary System Using an Innovative LOCI-based Background Subtraction Technique, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and M-band Imaging of the HR 8799 Planetary System Using an Innovative LOCI-based Background Subtraction Technique will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-478109