Unsupervised Learning for Target Tracking and Background Subtraction in Satellite Imagery

Autor: Kent, Jonathan S., Wamsley, Charles C., Flateau, Davin, Ferguson, Amber

Publikováno v: Conference: SPIE 2021, Artificial Intelligence and Machine Learning for Multi-Domain Operations Applications III. Volume: 11746. Pages: 117460H. Year: 2021. Organization: International Society for Optics and Photonics

This paper describes an unsupervised machine learning methodology capable of target tracking and background suppression via a novel dual-model approach. ``Jekyll`` produces a video bit-mask describing an estimate of the locations of moving objects, a

Externí odkaz: http://arxiv.org/abs/2109.00885

$Extrasolar~Storms$: Pressure-dependent Changes In Light Curve Phase In Brown Dwarfs From Simultaneous $Hubble$ and $Spitzer$ Observations

Autor: Yang, Hao, Apai, Dániel, Marley, Mark S., Karalidi, Theodora, Flateau, Davin, Showman, Adam P., Metchev, Stanimir, Buenzli, Esther, Radigan, Jacqueline, Artigau, Étienne, Lowrance, Patrick J., Burgasser, Adam J.

We present $Spitzer$/IRAC Ch1 and Ch2 monitoring of six brown dwarfs during 8 different epochs over the course of 20 months. For four brown dwarfs, we also obtained simulataneous $HST$/WFC3 G141 Grism spectra during two epochs and derived light curve

Externí odkaz: http://arxiv.org/abs/1605.02708

HST Rotational Spectral Mapping of Two L-Type Brown Dwarfs: Variability In and Out of Water Bands Indicates High-Altitude Haze Layers

Autor: Yang, Hao, Apai, Daniel, Marley, Mark S., Saumon, Didier, Morley, Caroline V., Buenzli, Esther, Artigau, Etienne, Radigan, Jacqueline, Metchev, Stanimir, Burgasser, Adam J., Mohanty, Subhanjoy, Lowrance, Patrick L., Showman, Adam P., Karalidi, Theodora, Flateau, Davin, Heinze, Aren N.

We present time-resolved near-infrared spectroscopy of two L5 dwarfs, 2MASS J18212815+1414010 and 2MASS J15074759-1627386, observed with the Wide Field Camera 3 instrument on the Hubble Space Telescope (HST). We study the wavelength dependence of rot

Externí odkaz: http://arxiv.org/abs/1411.2911

Weather on Other Worlds I: Detection of Periodic Variability in the L3 Dwarf DENIS-P J1058.7-1548 with Precise Multi-Wavelength Photometry

Autor: Heinze, Aren N., Metchev, Stanimir, Apai, Daniel, Flateau, Davin, Kurtev, Radostin, Marley, Mark, Radigan, Jacqueline, Burgasser, Adam J., Artigau, Étienne, Plavchan, Peter

Photometric monitoring from warm Spitzer reveals that the L3 dwarf DENIS-P J1058.7-1548 varies sinusoidally in brightness with a period of 4.25 +0.26/-0.16 hours and an amplitude of 0.388 +/- 0.043% (peak-to-valley) in the 3.6 micron band, confirming

Externí odkaz: http://arxiv.org/abs/1303.2948

Abundances of Stars with Planets: Trends with Condensation Temperature

Autor: Schuler, Simon C., Flateau, Davin, Cunha, Katia, King, Jeremy R., Ghezzi, Luan, Smith, Verne V.

Precise abundances of 18 elements have been derived for ten stars known to host giant planets from high signal-to-noise ratio, high-resolution echelle spectroscopy. Internal uncertainties in the derived abundances are typically <=0.05 dex. The stars

Externí odkaz: http://arxiv.org/abs/1103.0757