Aidan Gibbs

Simulations of Flare Chemistry in Brown Dwarf Companions to Active M Dwarfs

Aidan Gibbs, Michael P. Fitzgerald

Abstract Brown dwarfs that are short-period (<10 days) companions to actively flaring M dwarfs may provide a context to directly observe flare-driven photochemistry and structural changes in an extrasolar planet-like atmosphere. To assess the viability of directly observing flare impacts in the …

Simulations of Flare Chemistry in Brown Dwarf Companions to Active M Dwarfs

Aidan Gibbs, Michael P. Fitzgerald

Brown dwarfs that are short period ($<10\,$day) companions to actively flaring M dwarfs may provide a context to directly observe flare-driven photochemistry and structural changes in an extrasolar planet-like atmosphere. To assess the viability of directly observing flare impacts in the atmosphere …

SCExAO/CHARIS Spectroscopic Characterization of Cloudy L/T Transition Companion Brown Dwarf HIP 93398 B

Briley L Lewis, Yiting Li, Aidan Gibbs, Michael P. Fitzgerald et autres

Abstract Brown dwarfs with measured dynamical masses and spectra from direct imaging are benchmarks that anchor substellar atmosphere cooling and evolution models. We present Subaru SCExAO/CHARIS infrared spectroscopy of HIP 93398 B, a brown dwarf companion recently discovered by Y. Li et …

SCExAO/CHARIS Spectroscopic Characterization of Cloudy L/T Transition Companion Brown Dwarf HIP 93398 B

Briley L Lewis, Yiting Li, Aidan Gibbs, Michael P. Fitzgerald et autres

Brown dwarfs with measured dynamical masses and spectra from direct imaging are benchmarks that anchor substellar atmosphere cooling and evolution models. We present Subaru SCExAO/CHARIS infrared spectroscopy of HIP 93398 B, a brown dwarf companion recently discovered by Li et al. 2023 …

Subaru/CHARIS High-resolution Mode Spectroscopy of the Brown Dwarf Companion HD 33632 Ab

Aidan Gibbs, Briley L Lewis, Michael P. Fitzgerald, Timothy D. Brandt et autres

Abstract Brown dwarfs (BDs) are model degenerate in age and mass. High-contrast imaging and spectroscopy of BD companions to host stars where the mass and age can be independently constrained by dynamics and stellar age indicators, respectively, provide valuable tests of BD …

The Keck-HGCA Pilot Survey – II. Direct imaging discovery of HD 63754 B, a ∼20 au massive companion near the hydrogen burning limit

Yiting Li, Timothy D. Brandt, Kyle Franson, Qier An et autres

ABSTRACT We present the joint astrometric and direct imaging discovery, mass measurement, and orbital analysis of HD 63754 B (HIP 38216 B), a companion near the stellar-substellar boundary orbiting $\sim$20 au from its Sun-like host. HD 63754 was observed in our ongoing …

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The Keck-HGCA Pilot Survey II: Direct Imaging Discovery of HD 63754 B, a ~20 au Massive Companion Near the Hydrogen Burning Limit

Yiting Li, Timothy D. Brandt, Kyle Franson, Qier An et autres

We present the joint astrometric and direct imaging discovery, mass measurement, and orbital analysis of HD 63754 B (HIP 38216 B), a companion near the stellar-substellar boundary orbiting ~20 AU from its Sun-like host. HD 63754 was observed in our ongoing high-contrast …

Subaru/CHARIS High-Resolution Mode Spectroscopy of the Brown Dwarf Companion HD 33632 Ab

Aidan Gibbs, Briley L Lewis, Michael Fitzgerald, Timothy D. Brandt et autres

Brown dwarfs (BD) are model degenerate in age and mass. High-contrast imaging and spectroscopy of BD companions to host stars where the mass and age can be independently constrained by dynamics and stellar age indicators respectively provide valuable tests of BD evolution …

Web platform for calculations of SNR and exposure time with Specsim for TMT-MODHIS and Keck-HISPEC

Huihao Zhang, Ashley Baker, Dimitri Mawet, Jean-Baptiste Ruffio et autres

Specsim is a Python package for simulating spectroscopic observations with TMT-MODHIS and Keck-HISPEC, which are both high-resolution (R~100,000) diffraction-limited spectrographs each covering y, J, H, and K bands simultaneously. The simulators compute the total number of photons arriving at the detector per …

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Direct-imaging Discovery of a Substellar Companion Orbiting the Accelerating Variable Star HIP 39017

Taylor Tobin, Thayne Currie, Yiting Li, Jeffrey Chilcote et autres

Abstract We present the direct-imaging discovery of a substellar companion (a massive planet or low-mass brown dwarf) to the young, γ Doradus (γ Dor)-type variable star HIP 39017 (HD 65526). The companion’s SCExAO/CHARIS JHK (1.1–2.4 μm) spectrum and Keck/NIRC2 L ′ photometry …

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The development of HISPEC for Keck and MODHIS for TMT: science cases and predicted sensitivities

Quinn Konopacky, Ashley Baker, Dimitri P. Mawet, Michael P. Fitzgerald et autres

HISPEC is a new, high-resolution near-infrared spectrograph being designed for the W.M. Keck II telescope. By offering single-shot, R 100,000 spectroscopy between 0.98 – 2.5 μm, HISPEC will enable spectroscopy of transiting and non-transiting exoplanets in close orbits, direct high-contrast detection and …

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The development of HISPEC for Keck and MODHIS for TMT: science cases and predicted sensitivities

Quinn Konopacky, Ashley Baker, Dimitri P. Mawet, Michael P. Fitzgerald et autres

HISPEC is a new, high-resolution near-infrared spectrograph being designed for the W.M. Keck II telescope. By offering single-shot, R=100,000 between 0.98 - 2.5 um, HISPEC will enable spectroscopy of transiting and non-transiting exoplanets in close orbits, direct high-contrast detection and spectroscopy of …