Fredrik T. Rantakyrö
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View article: Characterization of the Host Binary of the Directly Imaged Exoplanet HD 143811 AB b
Characterization of the Host Binary of the Directly Imaged Exoplanet HD 143811 AB b Open
HD 143811 AB is the host star to the directly imaged planet HD 143811 AB b, which was recently discovered using data from the Gemini Planet Imager and Keck NIRC2. A member of the Sco-Cen star-forming region with an age of 13 ± 4 Myr, HD 14…
View article: HD 143811 AB b: A Directly Imaged Planet Orbiting a Spectroscopic Binary in Sco-Cen
HD 143811 AB b: A Directly Imaged Planet Orbiting a Spectroscopic Binary in Sco-Cen Open
We present confirmation of HD 143811 AB b, a substellar companion to spectroscopic binary HD 143811 AB through direct imaging with the Gemini Planet Imager (GPI) and Keck NIRC2. HD 143811 AB was observed as a part of the GPI Exoplanet Surv…
View article: Characterization of the Host Binary of the Directly Imaged Exoplanet HD 143811 AB b
Characterization of the Host Binary of the Directly Imaged Exoplanet HD 143811 AB b Open
HD~143811~AB is the host star to the directly imaged planet HD~143811~AB~b, which was recently discovered using data from the Gemini Planet Imager and Keck NIRC2. A member of the Sco-Cen star-forming region with an age of $13 \pm 4$ Myr, H…
View article: HD 143811 AB b: A Directly Imaged Planet Orbiting a Spectroscopic Binary in Sco-Cen
HD 143811 AB b: A Directly Imaged Planet Orbiting a Spectroscopic Binary in Sco-Cen Open
We present confirmation of HD 143811 AB b, a substellar companion to spectroscopic binary HD 143811 AB through direct imaging with the Gemini Planet Imager (GPI) and Keck NIRC2. HD 143811 AB was observed as a part of the Gemini Planet Imag…
View article: Towards quantum-enhanced long-baseline optical/near-IR interferometry
Towards quantum-enhanced long-baseline optical/near-IR interferometry Open
Microarcsecond resolutions afforded by an optical-NIR array with kilometer-baselines would enable breakthrough science. However significant technology barriers exist in transporting weakly coherent photon states over these distances: prima…
View article: A uniform analysis of debris discs with the Gemini Planet Imager II: constraints on dust density distribution using empirically informed scattering phase functions
A uniform analysis of debris discs with the Gemini Planet Imager II: constraints on dust density distribution using empirically informed scattering phase functions Open
Spatially resolved images of debris discs are necessary to determine disc morphological properties and the scattering phase function (SPF) thatantifies the brightness of scattered light as a function of phase angle. Current high-contrast i…
View article: A Uniform Analysis of Debris Disks with the Gemini Planet Imager. I. An Empirical Search for Perturbations from Planetary Companions in Polarized Light Images
A Uniform Analysis of Debris Disks with the Gemini Planet Imager. I. An Empirical Search for Perturbations from Planetary Companions in Polarized Light Images Open
The Gemini Planet Imager (GPI) has excelled in imaging debris disks in the near-infrared. The GPI Exoplanet Survey imaged 24 debris disks in polarized H -band light, while other programs observed half of these disks in polarized J and/or K…
View article: A Uniform Analysis of Debris Disks with the Gemini Planet Imager I: An Empirical Search for Perturbations from Planetary Companions in Polarized Light Images
A Uniform Analysis of Debris Disks with the Gemini Planet Imager I: An Empirical Search for Perturbations from Planetary Companions in Polarized Light Images Open
The Gemini Planet Imager (GPI) has excelled in imaging debris disks in the near-infrared. The GPI Exoplanet Survey (GPIES) imaged twenty-four debris disks in polarized $H$-band light, while other programs observed half of these disks in po…
View article: GPI 2.0: Performance Evaluation of the Wavefront Sensor's EMCCD
GPI 2.0: Performance Evaluation of the Wavefront Sensor's EMCCD Open
The Gemini Planet Imager (GPI) is a high contrast imaging instrument that aims to detect and characterize extrasolar planets. GPI is being upgraded to GPI 2.0, with several subsystems receiving a re-design to improve the instrument's contr…
View article: Testing the Interaction between a Substellar Companion and a Debris Disk in the HR 2562 System
Testing the Interaction between a Substellar Companion and a Debris Disk in the HR 2562 System Open
The HR 2562 system is a rare case where a brown dwarf companion resides in a cleared inner hole of a debris disk, offering invaluable opportunities to study the dynamical interaction between a substellar companion and a dusty disk. We pres…
View article: Testing the Interaction Between a Substellar Companion and a Debris Disk in the HR 2562 System
Testing the Interaction Between a Substellar Companion and a Debris Disk in the HR 2562 System Open
The HR 2562 system is a rare case where a brown dwarf companion resides in a cleared inner hole of a debris disk, offering invaluable opportunities to study the dynamical interaction between a substellar companion and a dusty disk. We pres…
View article: GPI 2.0: performance evaluation of the wavefront sensor’s EMCCD
GPI 2.0: performance evaluation of the wavefront sensor’s EMCCD Open
The Gemini Planet Imager (GPI) is a high contrast imaging instrument that aims to detect and characterize extrasolar planets. GPI is being upgraded to GPI 2.0, with several subsystems receiving a re-design to improve the instrument\'s cont…
View article: Multiband Polarimetric Imaging of HR 4796A with the Gemini Planet Imager
Multiband Polarimetric Imaging of HR 4796A with the Gemini Planet Imager Open
HR4796A hosts a well-studied debris disk with a long history due to its high fractional luminosity and favorable inclination, which facilitate both unresolved and resolved observations. We present new J - and K 1 -band images of the resolv…
View article: Debris Disk Results from the Gemini Planet Imager Exoplanet Survey's Polarimetric Imaging Campaign
Debris Disk Results from the Gemini Planet Imager Exoplanet Survey's Polarimetric Imaging Campaign Open
We report the results of a ∼4 yr direct imaging survey of 104 stars to resolve and characterize circumstellar debris disks in scattered light as part of the Gemini Planet Imager (GPI) Exoplanet Survey. We targeted nearby (≲150 pc), young (…
View article: HD 165054: An Astrometric Calibration Field for High-contrast Imagers in Baade’s Window
HD 165054: An Astrometric Calibration Field for High-contrast Imagers in Baade’s Window Open
We present a study of the HD 165054 astrometric calibration field that has been periodically observed with the Gemini Planet Imager (GPI). HD 165054 is a bright star within Baade’s Window, a region of the galactic plane with relatively low…
View article: Debris Disk Results from the Gemini Planet Imager Exoplanet Survey's Polarimetric Imaging Campaign
Debris Disk Results from the Gemini Planet Imager Exoplanet Survey's Polarimetric Imaging Campaign Open
We report the results of a ${\sim}4$-year direct imaging survey of 104 stars to resolve and characterize circumstellar debris disks in scattered light as part of the Gemini Planet Imager Exoplanet Survey. We targeted nearby (${\lesssim}150…
View article: First Resolved Scattered-light Images of Four Debris Disks in Scorpius-Centaurus with the Gemini Planet Imager
First Resolved Scattered-light Images of Four Debris Disks in Scorpius-Centaurus with the Gemini Planet Imager Open
We present the first spatially resolved scattered-light images of four debris disks around members of the Scorpius-Centaurus (Sco-Cen) OB association with high-contrast imaging and polarimetry using the Gemini Planet Imager (GPI). All four…
View article: Asymmetries in adaptive optics point spread functions
Asymmetries in adaptive optics point spread functions Open
An explanation for the origin of asymmetry along the preferential axis of the PSF of an AO system is developed. When phase errors from high altitude turbulence scintillate due to Fresnel propagation, wavefront amplitude errors may be spati…
View article: Strategic Scientific Plan for Gemini Observatory
Strategic Scientific Plan for Gemini Observatory Open
We present the Strategic Scientific Plan (SSP) for the direction and activities of the Gemini Observatory in the 2020s. The overarching goal is to ensure that Gemini best uses the available resources to serve the needs of its international…
View article: An Exo–Kuiper Belt with an Extended Halo around HD 191089 in Scattered Light
An Exo–Kuiper Belt with an Extended Halo around HD 191089 in Scattered Light Open
We have obtained Hubble Space Telescope STIS and NICMOS and Gemini /GPI scattered-light images of the HD 191089 debris disk. We identify two spatial components: a ring resembling the Kuiper Belt in radial extent (FWHM ∼ 25 au, centered at …
View article: The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics from 10 to 100 au
The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics from 10 to 100 au Open
We present a statistical analysis of the first 300 stars observed by the Gemini Planet Imager Exoplanet Survey. This subsample includes six detected planets and three brown dwarfs; from these detections and our contrast curves we infer the…
View article: Dynamical Constraints on the HR 8799 Planets with GPI
Dynamical Constraints on the HR 8799 Planets with GPI Open
The HR 8799 system uniquely harbors four young super-Jupiters whose orbits can provide insights into the system’s dynamical history and constrain the masses of the planets themselves. Using the Gemini Planet Imager, we obtained down to one…
View article: Dynamical Constraints on the HR 8799 Planets with GPI
Dynamical Constraints on the HR 8799 Planets with GPI Open
The HR 8799 system uniquely harbors four young super-Jupiters whose orbits can provide insights into the system's dynamical history and constrain the masses of the planets themselves. Using the Gemini Planet Imager (GPI), we obtained down …
View article: Direct Imaging of the HD 35841 Debris Disk: A Polarized Dust Ring from Gemini Planet Imager and an Outer Halo from HST/STIS
Direct Imaging of the HD 35841 Debris Disk: A Polarized Dust Ring from Gemini Planet Imager and an Outer Halo from HST/STIS Open
We present new high resolution imaging of a light-scattering dust ring and halo around the young star HD 35841. Using spectroscopic and polarimetric data from the Gemini Planet Imager in H -band (1.6 μ m), we detect the highly inclined ( i…
View article: Characterizing 51 Eri b from 1 to 5 μm: A Partly Cloudy Exoplanet
Characterizing 51 Eri b from 1 to 5 μm: A Partly Cloudy Exoplanet Open
We present spectrophotometry spanning 1–5 μ m of 51 Eridani b, a 2–10 planet discovered by the Gemini Planet Imager Exoplanet Survey. In this study, we present new K 1 (1.90–2.19 μ m) and K 2 (2.10–2.40 μ m) spectra taken with the Gemini P…
View article: Improving and Assessing Planet Sensitivity of the GPI Exoplanet Survey with a Forward Model Matched Filter
Improving and Assessing Planet Sensitivity of the GPI Exoplanet Survey with a Forward Model Matched Filter Open
We present a new matched-filter algorithm for direct detection of point sources in the immediate vicinity of bright stars. The stellar point-spread function (PSF) is first subtracted using a Karhunen-Loéve image processing (KLIP) algorithm…
View article: Complex Spiral Structure in the HD 100546 Transitional Disk as Revealed by GPI and MagAO
Complex Spiral Structure in the HD 100546 Transitional Disk as Revealed by GPI and MagAO Open
We present optical and near-infrared high-contrast images of the transitional disk HD 100546 taken with the Magellan Adaptive Optics system (MagAO) and the Gemini Planet Imager (GPI). GPI data include both polarized intensity and total int…
View article: An Optical/Near-infrared Investigation of HD 100546 b with the Gemini Planet Imager and MagAO
An Optical/Near-infrared Investigation of HD 100546 b with the Gemini Planet Imager and MagAO Open
We present H band spectroscopic and H α photometric observations of HD 100546 obtained with the Gemini Planet Imager and the Magellan Visible AO camera. We detect H band emission at the location of the protoplanet HD 100546 b, but show tha…
View article: Integral Field Spectroscopy of the Low-mass Companion HD 984 B with the Gemini Planet Imager
Integral Field Spectroscopy of the Low-mass Companion HD 984 B with the Gemini Planet Imager Open
We present new observations of the low-mass companion to HD 984 taken with the Gemini Planet Imager (GPI) as a part of the GPI Exoplanet Survey campaign. Images of HD 984 B were obtained in the J (1.12–1.3 μ m) and H (1.50–1.80 μ m) bands.…
View article: 1–2.4 μm Near-IR Spectrum of the Giant Planet β Pictoris b Obtained with the Gemini Planet Imager
1–2.4 μm Near-IR Spectrum of the Giant Planet β Pictoris b Obtained with the Gemini Planet Imager Open
Using the Gemini Planet Imager located at Gemini South, we measured the near-infrared (1.0–2.4 μ m) spectrum of the planetary companion to the nearby, young star β Pictoris. We compare the spectrum obtained with currently published model g…