René Heller
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View article: Confirmation of a Non‐Transiting Planet in the Habitable Zone of the Nearby M Dwarf L 98‐59
Confirmation of a Non‐Transiting Planet in the Habitable Zone of the Nearby M Dwarf L 98‐59 Open
Only 40 exoplanetary systems with five or more planets are currently known. These systems are crucial for our understanding of planet formation and planet‐planet interaction. The M dwarf L 98‐59 has previously been found to show evidence o…
View article: Heteroepitaxial growth of β-Ga2O3 thin films on Si (111) substrates via interfacial engineering for self-powered ultraviolet photodetectors
Heteroepitaxial growth of β-Ga2O3 thin films on Si (111) substrates via interfacial engineering for self-powered ultraviolet photodetectors Open
View article: Confirmation of a non-transiting planet in the habitable zone of the nearby M dwarf L 98-59
Confirmation of a non-transiting planet in the habitable zone of the nearby M dwarf L 98-59 Open
Only 40 exoplanetary systems with five or more planets are currently known. These systems are crucial for our understanding of planet formation and planet-planet interaction. The M dwarf L 98-59 has previously been found to show evidence o…
View article: A comparative study of target fabrication strategies for microgram muonic atom spectroscopy
A comparative study of target fabrication strategies for microgram muonic atom spectroscopy Open
Muonic atom spectroscopy is a method that can determine absolute nuclear charge radii with typical relative precision of [Formula: see text]. Recent developments have enabled to extend muonic atom spectroscopy to microscopic target quantit…
View article: Superhabitable Planets Around Mid‐Type K Dwarf Stars Enhance Simulated <scp>JWST</scp> Observability and Surface Habitability
Superhabitable Planets Around Mid‐Type K Dwarf Stars Enhance Simulated <span>JWST</span> Observability and Surface Habitability Open
In our search for life beyond the Solar System, certain planetary bodies may be more conducive to life than Earth. However, the observability of these “superhabitable” (SH) planets in the habitable zones around K dwarf stars has not been f…
View article: Superhabitable Planets Around Mid-Type K Dwarf Stars Enhance Simulated JWST Observability and Surface Habitability
Superhabitable Planets Around Mid-Type K Dwarf Stars Enhance Simulated JWST Observability and Surface Habitability Open
In our search for life beyond the Solar System, certain planetary bodies may be more conducive to life than Earth. However, the observability of these `superhabitable' planets in the habitable zones around K dwarf stars has not been fully …
View article: Anisotropy of radiation-induced defects in Yb-implanted β-Ga2O3
Anisotropy of radiation-induced defects in Yb-implanted β-Ga2O3 Open
View article: A False Positive Transit Candidate for EPIC 211101996 from K2 and TESS Data Identified as Background Eclipsing Binary Gaia DR3 66767847894609792
A False Positive Transit Candidate for EPIC 211101996 from K2 and TESS Data Identified as Background Eclipsing Binary Gaia DR3 66767847894609792 Open
Transiting planets around young stars are hard to find due to the enhanced stellar activity. Only a few transiting planets have been detected around stars younger than 100 Myr. We initially detected a transit-like signal in the K2 light cu…
View article: Crystal Lattice Recovery and Optical Activation of Yb Implanted into β-Ga2O3
Crystal Lattice Recovery and Optical Activation of Yb Implanted into β-Ga2O3 Open
β-Ga2O3 is an ultra-wide bandgap semiconductor (Eg~4.8 eV) of interest for many applications, including optoelectronics. Undoped Ga2O3 emits light in the UV range that can be tuned to the visible region of the spectrum by rare earth dopant…
View article: Exocomet orbital distribution around <i>β</i> Pictoris
Exocomet orbital distribution around <i>β</i> Pictoris Open
The ~23 Myr young star β Pictoris ( β Pic) is a laboratory for planet formation studies because of its observed debris disk, its directly imaged super-Jovian planets β Pic b and c, and the evidence of extrasolar comets that regularly trans…
View article: Achieving ultralow contact resistivity in Si via Te hyperdoping and millisecond post-metallization annealing
Achieving ultralow contact resistivity in Si via Te hyperdoping and millisecond post-metallization annealing Open
Achieving extremely low specific contact resistance (ρc) has become a critical challenge for nanoelectronics to achieve high device performance with increased miniaturization. In this work, we explore the use of Tellurium hyperdoping and m…
View article: Anisotropy of radiation-induced defects in Yb-implanted β-Ga2O3
Anisotropy of radiation-induced defects in Yb-implanted β-Ga2O3 Open
RE-doped β-Ga2O3 seems attractive for future high-power LEDs operating in high irradiation environments. In this work, we pay special attention to the issue of radiation-induced defect anisotropy in β-Ga2O3, which is crucial for device man…
View article: Enhanced near-infrared absorption in Au-hyperdoped Si: interplay between mid-gap states and plasmon resonance
Enhanced near-infrared absorption in Au-hyperdoped Si: interplay between mid-gap states and plasmon resonance Open
Detecting near-infrared (NIR) light with high efficiency is crucial for photodetectors that are applied in optical communication systems. Si hyperdoped with deep-level impurities provides a monolithic platform for infrared optoelectronics …
View article: Exomoons and Exorings with the Habitable Worlds Observatory. I. On the Detection of Earth–Moon Analog Shadows and Eclipses
Exomoons and Exorings with the Habitable Worlds Observatory. I. On the Detection of Earth–Moon Analog Shadows and Eclipses Open
The highest priority recommendation of the Astro2020 Decadal Survey for space-based astronomy was the construction of an observatory capable of characterizing habitable worlds. In this paper series we explore the detectability of and inter…
View article: Probing Superhabitable Worlds: Modeling Exoplanetary Atmospheres for simulated JWST Observations
Probing Superhabitable Worlds: Modeling Exoplanetary Atmospheres for simulated JWST Observations Open
In our search for life in the Universe, there may be planetary bodies that are more conducive to life than Earth. Even Earth's habitability has varied enormously throughout the eons. We call worlds that are more habitable than Earth today …
View article: Structural changes in Ge1-xSnx and Si1-x-yGeySnx thin films on SOI substrates treated by pulse laser annealing
Structural changes in Ge1-xSnx and Si1-x-yGeySnx thin films on SOI substrates treated by pulse laser annealing Open
Ge1-xSnx and Si1-x-yGeySnx alloys are promising materials for future opto- and nanoelectronics applications. These alloys enable effective band-gap engineering, broad adjustability of their lattice parameter, exhibit much higher carrier mo…
View article: Temperature Effects of Nuclear and Electronic Stopping Power on Si and C Radiation Damage in 3C-SiC
Temperature Effects of Nuclear and Electronic Stopping Power on Si and C Radiation Damage in 3C-SiC Open
Silicon carbide has been considered a material for use in the construction of advanced high-temperature nuclear reactors. However, one of the most important design issues for future reactors is the development of structural defects in SiC …
View article: The TEMPO Survey II: Science Cases Leveraged from a Proposed 30-Day Time Domain Survey of the Orion Nebula with the Nancy Grace Roman Space Telescope
The TEMPO Survey II: Science Cases Leveraged from a Proposed 30-Day Time Domain Survey of the Orion Nebula with the Nancy Grace Roman Space Telescope Open
The TEMPO (Transiting Exosatellites, Moons, and Planets in Orion) Survey is a proposed 30-day observational campaign using the Nancy Grace Roman Space Telescope. By providing deep, high-resolution, short-cadence infrared photometry of a dy…
View article: Observation of Significant Photosynthesis in Garden Cress and Cyanobacteria under Simulated Illumination from a K Dwarf Star
Observation of Significant Photosynthesis in Garden Cress and Cyanobacteria under Simulated Illumination from a K Dwarf Star Open
Stars with about 45 to 80% the mass of the Sun, so-called K dwarf stars, have previously been proposed as optimal host stars in the search for habitable extrasolar worlds. These stars are abundant, have stable luminosities over billions of…
View article: Exomoons & Exorings with the Habitable Worlds Observatory I: On the Detection of Earth-Moon Analog Shadows & Eclipses
Exomoons & Exorings with the Habitable Worlds Observatory I: On the Detection of Earth-Moon Analog Shadows & Eclipses Open
The highest priority recommendation of the Astro2020 Decadal Survey for space-based astronomy was the construction of an observatory capable of characterizing habitable worlds. In this paper series we explore the detectability of and inter…
View article: Ultrafast transfer of low-mass payloads to Mars and beyond using aerographite solar sails
Ultrafast transfer of low-mass payloads to Mars and beyond using aerographite solar sails Open
With interstellar mission concepts now being under study by various space agencies and institutions, a feasible and worthy interstellar precursor mission concept will be key to the success of the long shot. Here we investigate interstellar…
View article: First study of the location of deuterium in displacement-damaged tungsten by nuclear reaction analysis in channeling configuration
First study of the location of deuterium in displacement-damaged tungsten by nuclear reaction analysis in channeling configuration Open
Nuclear reaction analysis (NRA-C) together with Rutherford backscattering spectrometry (RBS-C), both in a channeling configuration were used to study the location of deuterium (D) in irradiation-induced defects in tungsten (W) using a 3He …
View article: Defect accumulation in β-Ga2O3 implanted with Yb
Defect accumulation in β-Ga2O3 implanted with Yb Open
View article: Observation of significant photosynthesis in garden cress and cyanobacteria under simulated illumination from a K dwarf star
Observation of significant photosynthesis in garden cress and cyanobacteria under simulated illumination from a K dwarf star Open
Stars with about 45 to 80% the mass of the Sun, so-called K dwarf stars, have previously been proposed as optimal host stars in the search for habitable extrasolar worlds. These stars are abundant, have stable luminosities over billions of…
View article: Development of a New Efficient Luminescent Material Based on Beta-Ga2o3
Development of a New Efficient Luminescent Material Based on Beta-Ga2o3 Open
View article: Achieving Ultralow Contact Resistivity in Si via Te Hyperdoping and Millisecond Post-Metallization Annealing
Achieving Ultralow Contact Resistivity in Si via Te Hyperdoping and Millisecond Post-Metallization Annealing Open
View article: Large exomoons unlikely around Kepler-1625 b and Kepler-1708 b
Large exomoons unlikely around Kepler-1625 b and Kepler-1708 b Open
There are more than 200 moons in our Solar System, but their relatively small radii make similarly sized extrasolar moons very hard to detect with current instruments. The best exomoon candidates so far are two nearly Neptune-sized bodies …
View article: Variations in climate habitability parameters and their effect on Earth's biosphere during the Phanerozoic Eon
Variations in climate habitability parameters and their effect on Earth's biosphere during the Phanerozoic Eon Open
Essential insights on the characterization and quality of a detectable biosphere are gained by analyzing the effects of its environmental parameters. We compiled environmental and biological properties of the Phanerozoic Eon from various p…
View article: RoSETZ: Roman Survey of the Earth Transit Zone -- a SETI-optimized survey for habitable-zone exoplanets
RoSETZ: Roman Survey of the Earth Transit Zone -- a SETI-optimized survey for habitable-zone exoplanets Open
In this White Paper for Nancy Grace Roman Space Telescope (Roman) science, we propose the Roman Survey of the Earth Transit Zone (RoSETZ), a transit search for rocky planets within the habitable zones (HZs) of stars located within the Eart…
View article: TOI-2525 b and c: A Pair of Massive Warm Giant Planets with Strong Transit Timing Variations Revealed by TESS*
TOI-2525 b and c: A Pair of Massive Warm Giant Planets with Strong Transit Timing Variations Revealed by TESS* Open
The K-type star TOI-2525 has an estimated mass of M = M ⊙ and radius of R = R ⊙ observed by the TESS mission in 22 sectors (within sectors 1 and 39). The TESS light curves yield significant transit events of two compani…