A5020466718- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Solar and Space Plasma Dynamics
- Scientific Research and Discoveries
- Geophysics and Gravity Measurements
- Atmospheric Ozone and Climate
- Gamma-ray bursts and supernovae
- Calibration and Measurement Techniques
- Planetary Science and Exploration
- Spectroscopy and Laser Applications
- Scientific Measurement and Uncertainty Evaluation
- Adaptive optics and wavefront sensing
- Atmospheric and Environmental Gas Dynamics
- Spacecraft and Cryogenic Technologies
- Astronomical Observations and Instrumentation
- Atomic and Molecular Physics
University of Göttingen
2022-2024
Context . General circulation models of gas giant exoplanets predict equatorial jets that drive inhomogeneities in the atmospheric physical parameters across planetary surface. Aims We studied transmission spectrum hot Jupiter WASP-127 b during one transit K band with CRIRES + Methods Telluric and stellar signals were removed from data using SYSREM signal was investigated cross-correlation technique. After detecting a spectral indicative inhomogeneities, we employed Bayesian retrieval...
Context. When observing the atmospheres of transiting exoplanets using high-resolution spectroscopy, aim is to detect well-resolved spectral features with high signal-to-noise ratios (S/Ns), as possible today modern spectrographs. However, obtaining such high-quality observations comes a trade-off: lower cadence fewer, longer exposures across transit collects more photons thanks reduced overheads, enhancing S/N each observation, while higher several shorter minimises feature smearing due...
The dayside atmospheres of ultra-hot Jupiters (UHJs) are predicted to possess temperature inversion layers with extremely high temperatures at altitudes. We observed the thermal emission spectra WASP-18b and WASP-76b new CRIRES+ high-resolution spectrograph near-infrared wavelengths. Using cross-correlation technique, we detected strong CO lines in both planets, which confirms existence inversions on their hemispheres. two planets first UHJs orbiting F-type stars detected; previous...
Accurately estimating the C/O ratio of hot Jupiter atmospheres is a promising pathway towards understanding planet formation and migration, as well clouds overall atmospheric composition. The atmosphere WASP-43b has been extensively analysed using low-resolution observations with HST Spitzer, but these previous did not cover K band, which hosts prominent spectral features major carbon-bearing species such CO CH 4 . As result, ability to establish precise constraints on was limited. Moreover,...
Ultra-hot Jupiters are highly irradiated gas giant exoplanets on close-in orbits around their host stars. We analyzed high-resolution spectra from CARMENES, HARPS-N, and ESPaDOnS taken over eight observation nights to study the emission spectrum of WASP-33b draw conclusions about its atmosphere. By applying cross-correlation technique, we detected spectral signatures Ti I, V a tentative signal II for first time via spectroscopy. These detections an important finding because fundamental role...
During the first Gyr of their life, exoplanet atmospheres suffer from different atmospheric escape phenomena that can strongly affect shape and morphology itself. These processes be studied with Ly$\alpha$, H$\alpha$ and/or He I triplet observations. We present high-resolution spectroscopy observations CARMENES GIARPS checking for signals in 20 exoplanetary atmospheres: V1298Tau c, K2-100b, HD63433b, HD63433c, HD73583b, HD73583c, K2-77b, TOI-2076b, TOI-2048b, HD235088b, TOI-1807b, TOI-1136d,...
During the first billion years of their life, exoplanet atmospheres are modified by different atmospheric escape phenomena that can strongly affect shape and morphology itself. These processes be studied with Ly α , H and/or He I triplet observations. We present high-resolution spectroscopy observations from CARMENES GIARPS checking for signals in 20 exoplanetary atmospheres: V1298 Tau c, K2-100 b, HD 63433 73583 K2-77 TOI-2076 TOI-2048 235088 TOI-1807 TOI-1136 d, TOI-1268 TOI-1683 TOI-2018...
General circulation models of gas giant exoplanets predict equatorial jets that drive inhomogeneities across the planetary atmosphere. We studied transmission spectrum hot Jupiter WASP-127b during one transit in K band with CRIRES+. Telluric and stellar signals were removed from data using SYSREM signal was investigated cross-correlation (CCF) technique. After detecting a spectral indicative atmospheric inhomogeneities, we employed Bayesian retrieval framework 2D modelling approach tailored...
Ultrahot Jupiters are a type of gaseous exoplanet that orbit extremely close to their host star, resulting in significantly high equilibrium temperatures. In recent years, high-resolution emission spectroscopy has been broadly employed observing the atmospheres ultrahot Jupiters. We used CARMENES spectrograph observe spectra dayside hemisphere MASCARA-1b both visible and near-infrared. Through cross-correlation analysis, we detected signals Fe I Ti . Based on these detections, conducted an...
Despite recent progress in the spectroscopic characterization of individual exoplanets, atmospheres key ultra-hot Jupiters (UHJs) still lack comprehensive investigations. These include WASP-178b, one most irradiated UHJs known to date. We observed dayside emission signal this planet with CRIRES + spectral K band. By applying cross-correlation technique and a Bayesian retrieval framework high-resolution spectra, we identified signature 12 CO ( S/N = 8.9) H 2 O 4.9), strong atmospheric thermal...
To date, the hot Jupiter WASP-12 b has been only planet with confirmed orbital decay. The late F-type host star hypothesized to be surrounded by a large structure of circumstellar material evaporated from planet. We obtained two high-resolution spectral transit time series CARMENES and extensively searched for absorption signals atomic species Na, H, Ca, He using transmission spectroscopy, thereby covering I triplet high resolution first time. apply SYSREM line introduce technique signal...
To date, the hot Jupiter WASP–12 b has been only planet with confirmed orbital decay. The late F-type host star hypothesized to be surrounded by a large structure of circumstellar material evaporated from planet. We obtained two high-resolution spectral transit time series CARMENES and extensively searched for absorption signals atomic species Na, H, Ca, He using transmission spectroscopy, thereby covering I λ 10833 Å triplet high resolution first time. apply SYSREM line introduce technique...
Ultrahot Jupiters are a type of gaseous exoplanet that orbit extremely close to their host star, resulting in significantly high equilibrium temperatures. In recent years, high-resolution emission spectroscopy has been broadly employed observing the atmospheres ultrahot Jupiters. We used CARMENES spectrograph observe spectra dayside hemisphere MASCARA-1b both visible and near-infrared. Through cross-correlation analysis, we detected signals \ion{Fe}{i} \ion{Ti}{i}. Based on these detections,...
Despite recent progress in the spectroscopic characterization of individual exoplanets, atmospheres key ultra-hot Jupiters (UHJs) still lack comprehensive investigations. These include WASP-178b, one most irradiated UHJs known to date. We observed dayside emission signal this planet with CRIRES$^+$ spectral K-band. By applying cross-correlation technique and a Bayesian retrieval framework high-resolution spectra, we identified signature $^{12}$CO (S/N = 8.9) H$_2$O 4.9), strong atmospheric...
Transmission spectroscopy is a prime method to study the atmospheres of extrasolar planets. We obtained high-resolution spectral transit time series hot Jupiter with CRIRES$^+$ its atmosphere via transmission triplet lines. Our analysis shows prominent absorption feature moving along planetary orbital motion, which an observed, transit-averaged equivalent width approximately 30\,m slight redshift, and depth about 2\,<!PCT!>, can only be explained by overflowing Roche lobe. carried out...
The extreme temperature gradients from day- to nightside in the atmospheres of hot Jupiters generate fast winds form equatorial jets or day-to-night flows. Observations blue-shifted and red-shifted signals transmission dayside spectra WASP-189\,b have sparked discussions about nature on this planet. To investigate structure atmosphere ultra-hot Jupiter WASP-189\,b, we studied its emission spectrum with CRIRES$^+$ spectral K band. After removing stellar telluric lines, used cross-correlation...
The extreme temperature gradients from day- to nightside in the atmospheres of hot Jupiters generate fast winds form equatorial jets or day-to-night flows. Observations blue-shifted and red-shifted signals transmission dayside spectra WASP-189b have sparked discussions about nature on this planet. To investigate structure atmosphere ultra-hot Jupiter WASP-189b, we studied its emission spectrum with CRIRES$^+$ spectral K band. We used cross-correlation method detect CO Fe, employed a Bayesian...
Accurately estimating the C/O ratio of hot Jupiter atmospheres is a promising pathway towards understanding planet formation and migration, as well clouds overall atmospheric composition. The atmosphere WASP-43b has been extensively analysed using low-resolution observations with HST Spitzer, but these previous did not cover K band, which hosts prominent spectral features major carbon-bearing species such CO CH$_{4}$. As result, ability to establish precise constraints on was limited....
When observing the atmospheres of transiting exoplanets using high-resolution spectroscopy, one aims to detect well-resolved spectral features with high signal-to-noise ratios (SNR) as is possible today modern spectrographs. However, obtaining such high-quality observations comes a trade-off: lower cadence fewer, longer exposures across transit collects more photons thanks reduced overheads, enhancing SNR each observation, while higher several, shorter minimises feature smearing due...