Brett M. Morris
A5022671363- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
- Atmospheric Ozone and Climate
- Solar and Space Plasma Dynamics
- Spectroscopy and Laser Applications
- Calibration and Measurement Techniques
- History and Developments in Astronomy
- Computational Physics and Python Applications
- Geophysics and Gravity Measurements
- Advanced Semiconductor Detectors and Materials
- Scientific Research and Discoveries
- Scientific Computing and Data Management
- Advanced Data Storage Technologies
- Space Exploration and Technology
- Magnetic confinement fusion research
- Isotope Analysis in Ecology
- Planetary Science and Exploration
- Astrophysical Phenomena and Observations
- Atmospheric and Environmental Gas Dynamics
- Inertial Sensor and Navigation
Space Telescope Science Institute
2023-2024
University of Bern
2020-2024
Goddard Space Flight Center
2013-2024
Lawrence Livermore National Laboratory
2024
Cornell University
2022
Bishop's University
2022
Ames Research Center
2022
University of Washington
2016-2020
Max Planck Institute for Astronomy
2019
Max Planck Society
2019
Abstract The Astropy Project supports and fosters the development of open-source openly developed Python packages that provide commonly needed functionality to astronomical community. A key element is core package astropy , which serves as foundation for more specialized projects packages. In this article, we summarize features in recent major release, version 5.0, updates on Project. We then discuss supporting a broader ecosystem interoperable packages, including connections with several...
Abstract The Astropy Project supports and fosters the development of open-source openly developed Python packages that provide commonly needed functionality to astronomical community. A key element is core package astropy , which serves as foundation for more specialized projects packages. In this article, we an overview organization project summarize features in package, recent major release, version 2.0. We then describe infrastructure designed facilitate support a broader ecosystem...
astroquery is a collection of tools for requesting data from databases hosted on remote servers with interfaces exposed the internet, including those web pages but without formal application program interfaces. These are built Python requests package, which used to make HTTP requests, and astropy, provides most parsing functionality. modules generally attempt replicate page interface provided by given service as closely possible, making transition browser-based command-line interaction easy....
Abstract We have collected transit times for the TRAPPIST-1 system with Spitzer Space Telescope over four years. add to these ground-based, HST, and K2 transit-time measurements, revisit an N -body dynamical analysis of seven-planet using our complete set from which we refine mass ratios planets star. next carry out a photodynamical light curves derive density host star planet densities. find that all seven planets’ densities may be described single rocky mass–radius relation is depleted in...
Foreman-Mackey et al., (2021). exoplanet: Gradient-based probabilistic inference for exoplanet data & other astronomical time series. Journal of Open Source Software, 6(62), 3285, https://doi.org/10.21105/joss.03285
Abstract We present the optical spectroscopic evolution of SN 2023ixf seen in subnight cadence spectra from 1.18 to 15 days after explosion. identify high-ionization emission features, signatures interaction with material surrounding progenitor star, that fade over first 7 days, rapid between observed within same night. compare lines and their relative strength those other supernovae early interaction, finding a close match 2020pni 2017ahn spectrum 2014G at later epochs. To physically...
Abstract Study Analysis Group 21 (SAG21) of NASA’s Exoplanet Exploration Program was organized to study the effect stellar contamination on space-based transmission spectroscopy, a method for studying exoplanetary atmospheres by measuring wavelength-dependent radius planet as it transits its star. Transmission spectroscopy relies precise understanding spectrum star being occulted. However, stars are not homogeneous, constant light sources but have temporally evolving photospheres and...
Context. Using emission lines from metals, we investigate the three-dimensional distribution of temperature and chemistry in ultra-hot Jupiters. Aims. Existing observations WASP-121 b have suggested an underabundance titanium oxide its terminator region. In this study, aim to determine whether depletion is global by investigating dayside spectrum. Methods. We analyzed eight epochs high-resolution spectra obtained with ESPRESSO spectrograph, targeting orbital phases when view. used a...
Abstract We demonstrate a path to hitherto unachievable differential photometric precisions from the ground, both in optical and near-infrared (NIR), using custom-fabricated beam-shaping diffusers produced specialized nanofabrication techniques. Such mold focal plane image of star into broad stable top-hat shape, minimizing errors due non-uniform pixel response, atmospheric seeing effects, imperfect guiding, telescope-induced variable aberrations seen defocusing. This PSF reshaping...
Gas giants orbiting close to hot and massive early-type stars can reach dayside temperatures that are comparable those of the coldest stars. These "ultra-hot Jupiters" have atmospheres made ions atomic species from molecular dissociation feature strong day-to-night temperature gradients. Photometric observations at different orbital phases provide insights on planet atmospheric properties. We analyse photometric WASP-189 acquired with instrument CHEOPS derive constraints system architecture...
Ultra-hot Jupiters are tidally locked with their host stars, dividing atmospheres into a hot dayside and colder nightside. As the planet moves through transit, different regions of atmosphere rotate view, revealing chemical regimes. Highresolution spectrographs can observe asymmetries velocity shifts offer possibility for time-resolved spectroscopy. The ultra-hot Jupiter WASP-189 b has recently been found to possess rich transmission spectrum evidence atmospheric dynamics inhomogeneity. In...
Abstract The M8V star TRAPPIST-1 hosts seven roughly Earth-sized planets and is a promising target for exoplanet characterization. Kepler / K2 Campaign 12 observations of in the optical show an apparent rotational modulation with 3.3-day period, though that signal not readily detected Spitzer light curve at 4.5 μ m. If due to starspots, persistent dark spots can be excluded from lack photometric variability curve. We construct model photospheric bright on consistent both curves....
We present astroplan - an open source, development, Astropy affiliated package for ground-based observation planning and scheduling in Python. is designed to provide efficient access common observational quantities such as celestial rise, set, meridian transit times simple transformations from sky coordinates altitude-azimuth without requiring a detailed understanding of astropy's implementation coordinate systems. provides convenience functions generate plots airmass parallactic angle...
Abstract We carry out a phase-curve analysis of the KELT-9 system using photometric observations from NASA’s Transiting Exoplanet Survey Satellite (TESS). The measured secondary eclipse depth and peak-to-peak atmospheric brightness modulation are <?CDATA ${650}_{-15}^{+14}$?> 566 ± 16 ppm, respectively. planet’s variation reaches maximum 31 5 minutes before midpoint eclipse, indicating 5.°2 0.°9 eastward shift in dayside hot spot substellar point. also detect stellar pulsations on with...
We validate the discovery of a 2 Earth radii sub-Neptune-size planet around nearby high proper motion M2.5-dwarf G 9-40 (EPIC 212048748), using high-precision near-infrared (NIR) radial velocity (RV) observations with Habitable-zone Planet Finder (HPF), precision diffuser-assisted ground-based photometry custom narrow-band photometric filter, and adaptive optics imaging. At distance $d=27.9\mathrm{pc}$, 9-40b is second closest transiting discovered by K2 to date. The planet's large transit...
55 Cnc e is a transiting super-Earth (radius $1.88\rm\,R_\oplus$ and mass $8\rm\, M_\oplus$) orbiting G8V host star on 17-hour orbit. Spitzer observations of the planet's phase curve at 4.5 $\mu$m revealed time-varying occultation depth, MOST optical are consistent with amplitude offset maximum light. Both broadband high-resolution spectroscopic analyses either high mean molecular weight atmosphere or no for planet e. A long term photometric monitoring campaign an independent telescope...
We report the detection of secondary eclipse hot Jupiter HD 209458 b in optical/visible light using CHEOPS space telescope. Our measurement 20.4 −3.3 +3.2 parts per million translates into a geometric albedo A g = 0.096 ± 0.016. The previously estimated dayside temperature about 1500 K implies that our consists predominantly reflected starlight and is largely uncontaminated by thermal emission. This makes present result one most robust measurements for any exoplanet. calculations...
Exoplanets in the ultra-hot Jupiter regime provide an excellent laboratory for testing impact of stellar irradiation on dynamics and chemical composition gas giant atmospheres. In this study, we observed two transits WASP-189 b with MAROON-X/Gemini-North to probe its high-altitude atmospheric layers, using strong absorption lines. We derived posterior probability distributions planetary parameters by calculating spectrum behind planet at every orbital phase during transit. This was used...
We present observations spanning 355 orbital phases of HAT-P-7 observed by Kepler from May 2009 to March 2011 (Q1-9). find a shallower secondary eclipse depth than initially announced, consistent with low optical albedo and detection nearly exclusively thermal emission, without reflected light component. an approximately 10 ppm perturbation the average transit curve near phase -0.02 that we attribute temperature decrease on surface star, phased orbit planet. This cooler spot is...
We report the Transiting Exoplanet Survey Satellite (TESS) discovery of three terrestrial-sized planets transiting L 98-59 (TOI-175, TIC 307210830) -- a bright M dwarf at distance 10.6 pc. Using Gaia-measured and broad-band photometry we find that host star is an M3 dwarf. Combined with TESS transits from sectors, corresponding stellar parameters yield planet radii ranging 0.8REarth to 1.6REarth. All have short orbital periods, 2.25 7.45 days outer pair just wide 2:1 period resonance....
Abstract We measure the starspot radii and latitude distribution on K4 dwarf HAT-P-11 from Kepler short-cadence photometry. take advantage of occultations by HAT-P-11’s highly misaligned planet to compare spot size distributions those sunspots. find that spots are distributed in much like sunspots near solar activity maximum, with a mean ≈16° ± 1°. The majority starspots have physical sizes closely resemble at maximum. estimate spotted area coverage be <?CDATA ${3}_{-1}^{+6} \% $?> , roughly...