A5082509292- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Atmospheric Ozone and Climate
- Isotope Analysis in Ecology
- Astronomical Observations and Instrumentation
- Calibration and Measurement Techniques
- Planetary Science and Exploration
Max Planck Institute for Astronomy
2024
Max Planck Institute for Solar System Research
2020-2024
University of Göttingen
2020
University of California, Santa Cruz
2015
With sizable volatile envelopes but smaller radii than the solar system ice giants, sub-Neptunes have been revealed as one of most common types planet in galaxy. While spectroscopic characterization larger (2.5-4R$_\oplus$) has hydrogen-dominated atmospheres, (1.6--2.5R$_\oplus$) could either host thin, rapidly evaporating hydrogen-rich atmospheres or be stable metal-rich "water worlds" with high mean molecular weight and a fundamentally different formation evolutionary history. Here, we...
We present new, high-precision Doppler radial velocity (RV) data sets for the nearby K3V star HD 219134.The include 175 velocities obtained with HIRES Spectrograph at Keck I Telescope, and 101 Levy Automated Planet Finder Telescope (APF) Lick Observatory.Our observations reveal six new planetary candidates, orbital periods of P = 3. 1, 6.8, 22.8, 46.7, 94.2 2247 days, spanning masses M sin i 3.8, 3.5, 8.9, 21.3, 10.8 108 ⊕ respectively.Our analysis indicates that outermost signal is unlikely...
Our brains are hardwired for pattern recognition as correlations useful predicting and understanding nature. As more exoplanet atmospheres being characterized with JWST, we starting to unveil their properties on a population level. Here present framework comparing transmission spectroscopy from 3 5$\mu$m four bands: L (2.9 - 3.7$\mu$m), SO$_2$ (3.95 4.1$\mu$m), CO$_2$ (4.25 4.4$\mu$m) CO (4.5 4.9$\mu$m). Together, the bands cover major carbon, oxygen, nitrogen, sulfur-bearing molecules...
Abstract The atmospheres of ultra-hot Jupiters are unique compared to other planets because the presence both refractory and volatile gaseous species, enabling a new lens constrain planet’s composition, chemistry, formation. WASP-178b is one such Jupiter that was recently found exhibit enormous near-UV absorption between 0.2 0.4 μ m from some combination Fe+, Mg, SiO. Here, we present IR observations with Hubble Space Telescope (HST) WFC3 JWST NIRSpec G395H, providing novel measurements...
Abstract Sub-Neptunes, the most common planet type, remain poorly understood. Their atmospheres are expected to be diverse, but their compositions challenging determine, even with JWST. Here, we present first JWST spectroscopic study of warm sub-Neptune GJ 3090 b (2.13 R ⊕ , T eq,A = 0.3 ∼ 700 K), which orbits an M2V star, making it a favorable target for atmosphere characterization. We observed four transits b: two each using NIRISS/SOSS and NIRSpec/G395H, yielding wavelength coverage from...
Abstract Our brains are hardwired for pattern recognition as correlations useful predicting and understanding nature. As more exoplanet atmospheres being characterized with JWST, we starting to unveil their properties on a population level. Here present framework comparing transmission spectroscopy from 3 5 μ m four bands: L (2.9–3.7 m), SO 2 (3.95–4.1 CO (4.25–4.4 (4.5–4.9 m). Together, the bands cover major carbon-, oxygen-, nitrogen-, sulfur-bearing molecules including H O, CH 4 , NH S,...
Abstract WASP-121 b has been established as a benchmark ultrahot Jupiter, serving laboratory for the atmospheric chemistry and dynamics of strongly irradiated extrasolar gas giants. Here, we present analyze b's transmission spectrum observed with NIRSpec G395H on board James Webb Space Telescope find evidence thermal dissociation H 2 O planet's permanent dayside. Additionally, detect SiO at statistical significance 5.2 σ , which is compatible chemical equilibrium in atmosphere. Constraining...
Abstract Refractory elements such as iron, magnesium and silicon can be detected in the atmospheres of ultrahot giant planets. This provides an opportunity to quantify amount refractory material accreted during formation, along with volatile gases ices. However, simultaneous detections refractories volatiles have proved challenging, most prominent spectral features associated atoms molecules span a broad wavelength range. Here, using single JWST observation planet WASP-121 b, we report H 2 O...
Context . On October 31, 2009, the Photodetector Array Camera and Spectrometer (PACS) on board Herschel Space Observatory observed far-infrared spectra of Jupiter in wavelength range between 50 220 µm as part program “Water Related Chemistry Solar System”. The have an effective spectral resolution 900 3500, depending grating order. Aims We investigate disk-averaged chemical composition Jupiter’s atmosphere a function height using these observations. Methods used Planetary Spectrum Generator...
Context. On October 31, 2009, the Photodetector Array Camera and Spectrometer (PACS) onboard Herschel Space Observatory observed far infrared spectra of Jupiter in wavelength range between 50 220µm as part program ‘Water Related Chemistry Solar System’. The have an effective spectral resolution 900 3500, depending on grating order.Aims. We investigate disk-averaged chemical composition Jupiter's atmosphere a function height using these observations.Methods. used...
WASP-121b has been established as a benchmark Ultra-Hot Jupiter (UHJ), serving laboratory for the atmospheric chemistry and dynamics of strongly irradiated extrasolar gas giants. Here, we present analyze WASP-121b's transmission spectrum observed with NIRSpec G395H onboard James Webb Space Telescope (JWST) find evidence thermal dissociation H2O H2 on planet's permanent dayside. This finding demonstrates importance thermo-chemical heterogeneity within atmosphere which simultaneously probes...
On October 31, 2009, the Photodetector Array Camera and Spectrometer (PACS) onboard Herschel Space Observatory observed far infrared (FIR) spectra of Jupiter in wavelength range between 55 210 µm framework program ‘Water Related Chemistry Solar System’ [Hartogh et al., 2009]. We aim at inferring abundances trace constituents atmospheric temperature profile using these data, a line-by-line radiative transfer tool [Villanueva al. 2018] least-squares fitting...
In the framework of Priority Programme “Exploring Diversity Extrasolar Planets” (SPP 1992) German Research Foundation (DFG) we carried out project “The key physical-chemical processes determining Composition and Temperature (exo)planetary atmospheres”. Characterizing atmospheres extrasolar planets is a new frontier in exoplanetary science, dependent on observations interpretation toolkits. The intends addressing question current atmospheric research:...